T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
Files
aa84a4173c90bd3280b1171dda9c067a95be0824
wasmtime/cranelift/codegen/src/isa/aarch64/inst/mod.rs
Joey Gouly aa84a4173c arm64: Implement saturating SIMD arithmetic 
Copyright (c) 2020, Arm Limited.
2020-07-14 18:19:11 +01:00

3161 lines
103 KiB
Rust
Raw Blame History

//! This module defines aarch64-specific machine instruction types.
// Some variants are not constructed, but we still want them as options in the future.
#![allow(dead_code)]
use crate::binemit::CodeOffset;
use crate::ir::types::{
B1, B16, B16X8, B32, B32X4, B64, B64X2, B8, B8X16, F32, F32X2, F32X4, F64, F64X2, FFLAGS, I128,
I16, I16X4, I16X8, I32, I32X2, I32X4, I64, I64X2, I8, I8X16, I8X8, IFLAGS,
};
use crate::ir::{ExternalName, Opcode, SourceLoc, TrapCode, Type};
use crate::machinst::*;
use crate::{settings, CodegenError, CodegenResult};
use regalloc::{RealRegUniverse, Reg, RegClass, SpillSlot, VirtualReg, Writable};
use regalloc::{RegUsageCollector, RegUsageMapper};
use alloc::boxed::Box;
use alloc::vec::Vec;
use smallvec::{smallvec, SmallVec};
use std::string::{String, ToString};
pub mod regs;
pub use self::regs::*;
pub mod imms;
pub use self::imms::*;
pub mod args;
pub use self::args::*;
pub mod emit;
pub use self::emit::*;
#[cfg(test)]
mod emit_tests;
//=============================================================================
// Instructions (top level): definition
/// An ALU operation. This can be paired with several instruction formats
/// below (see `Inst`) in any combination.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum ALUOp {
Add32,
Add64,
Sub32,
Sub64,
Orr32,
Orr64,
/// NOR
OrrNot32,
/// NOR
OrrNot64,
And32,
And64,
/// NAND
AndNot32,
/// NAND
AndNot64,
/// XOR (AArch64 calls this "EOR")
Eor32,
/// XOR (AArch64 calls this "EOR")
Eor64,
/// XNOR (AArch64 calls this "EOR-NOT")
EorNot32,
/// XNOR (AArch64 calls this "EOR-NOT")
EorNot64,
/// Add, setting flags
AddS32,
/// Add, setting flags
AddS64,
/// Sub, setting flags
SubS32,
/// Sub, setting flags
SubS64,
/// Sub, setting flags, using extended registers
SubS64XR,
/// Multiply-add
MAdd32,
/// Multiply-add
MAdd64,
/// Multiply-sub
MSub32,
/// Multiply-sub
MSub64,
/// Signed multiply, high-word result
SMulH,
/// Unsigned multiply, high-word result
UMulH,
SDiv64,
UDiv64,
RotR32,
RotR64,
Lsr32,
Lsr64,
Asr32,
Asr64,
Lsl32,
Lsl64,
}
/// A floating-point unit (FPU) operation with one arg.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FPUOp1 {
Abs32,
Abs64,
Neg32,
Neg64,
Sqrt32,
Sqrt64,
Cvt32To64,
Cvt64To32,
}
/// A floating-point unit (FPU) operation with two args.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FPUOp2 {
Add32,
Add64,
Sub32,
Sub64,
Mul32,
Mul64,
Div32,
Div64,
Max32,
Max64,
Min32,
Min64,
}
/// A floating-point unit (FPU) operation with two args, a register and an immediate.
#[derive(Copy, Clone, Debug)]
pub enum FPUOpRI {
/// Unsigned right shift. Rd = Rn << #imm
UShr32(FPURightShiftImm),
/// Unsigned right shift. Rd = Rn << #imm
UShr64(FPURightShiftImm),
/// Shift left and insert. Rd |= Rn << #imm
Sli32(FPULeftShiftImm),
/// Shift left and insert. Rd |= Rn << #imm
Sli64(FPULeftShiftImm),
}
/// A floating-point unit (FPU) operation with three args.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FPUOp3 {
MAdd32,
MAdd64,
}
/// A conversion from an FP to an integer value.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FpuToIntOp {
F32ToU32,
F32ToI32,
F32ToU64,
F32ToI64,
F64ToU32,
F64ToI32,
F64ToU64,
F64ToI64,
}
/// A conversion from an integer to an FP value.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum IntToFpuOp {
U32ToF32,
I32ToF32,
U32ToF64,
I32ToF64,
U64ToF32,
I64ToF32,
U64ToF64,
I64ToF64,
}
/// Modes for FP rounding ops: round down (floor) or up (ceil), or toward zero (trunc), or to
/// nearest, and for 32- or 64-bit FP values.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FpuRoundMode {
Minus32,
Minus64,
Plus32,
Plus64,
Zero32,
Zero64,
Nearest32,
Nearest64,
}
/// Type of vector element extensions.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum VecExtendOp {
/// Signed extension of 8-bit elements
Sxtl8,
/// Signed extension of 16-bit elements
Sxtl16,
/// Signed extension of 32-bit elements
Sxtl32,
/// Unsigned extension of 8-bit elements
Uxtl8,
/// Unsigned extension of 16-bit elements
Uxtl16,
/// Unsigned extension of 32-bit elements
Uxtl32,
}
/// A vector ALU operation.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum VecALUOp {
/// Signed saturating add
SQAddScalar,
Sqadd,
/// Unsigned saturating add
UQAddScalar,
Uqadd,
/// Signed saturating subtract
SQSubScalar,
Sqsub,
/// Unsigned saturating subtract
UQSubScalar,
Uqsub,
/// Compare bitwise equal
Cmeq,
/// Compare signed greater than or equal
Cmge,
/// Compare signed greater than
Cmgt,
/// Compare unsigned higher
Cmhs,
/// Compare unsigned higher or same
Cmhi,
/// Floating-point compare equal
Fcmeq,
/// Floating-point compare greater than
Fcmgt,
/// Floating-point compare greater than or equal
Fcmge,
/// Bitwise and
And,
/// Bitwise bit clear
Bic,
/// Bitwise inclusive or
Orr,
/// Bitwise exclusive or
Eor,
/// Bitwise select
Bsl,
/// Unsigned maximum pairwise
Umaxp,
/// Add
Add,
/// Subtract
Sub,
/// Multiply
Mul,
/// Signed shift left
Sshl,
/// Unsigned shift left
Ushl,
}
/// A Vector miscellaneous operation with two registers.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum VecMisc2 {
/// Bitwise NOT
Not,
/// Negate
Neg,
}
/// An operation across the lanes of vectors.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum VecLanesOp {
/// Unsigned minimum across a vector
Uminv,
}
/// An operation on the bits of a register. This can be paired with several instruction formats
/// below (see `Inst`) in any combination.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum BitOp {
/// Bit reverse
RBit32,
/// Bit reverse
RBit64,
Clz32,
Clz64,
Cls32,
Cls64,
}
impl BitOp {
/// What is the opcode's native width?
pub fn inst_size(&self) -> InstSize {
match self {
BitOp::RBit32 | BitOp::Clz32 | BitOp::Cls32 => InstSize::Size32,
_ => InstSize::Size64,
}
}
/// Get the assembly mnemonic for this opcode.
pub fn op_str(&self) -> &'static str {
match self {
BitOp::RBit32 | BitOp::RBit64 => "rbit",
BitOp::Clz32 | BitOp::Clz64 => "clz",
BitOp::Cls32 | BitOp::Cls64 => "cls",
}
}
}
impl From<(Opcode, Type)> for BitOp {
/// Get the BitOp from the IR opcode.
fn from(op_ty: (Opcode, Type)) -> BitOp {
match op_ty {
(Opcode::Bitrev, I32) => BitOp::RBit32,
(Opcode::Bitrev, I64) => BitOp::RBit64,
(Opcode::Clz, I32) => BitOp::Clz32,
(Opcode::Clz, I64) => BitOp::Clz64,
(Opcode::Cls, I32) => BitOp::Cls32,
(Opcode::Cls, I64) => BitOp::Cls64,
_ => unreachable!("Called with non-bit op!: {:?}", op_ty),
}
}
}
/// Additional information for (direct) Call instructions, left out of line to lower the size of
/// the Inst enum.
#[derive(Clone, Debug)]
pub struct CallInfo {
pub dest: ExternalName,
pub uses: Vec<Reg>,
pub defs: Vec<Writable<Reg>>,
pub loc: SourceLoc,
pub opcode: Opcode,
}
/// Additional information for CallInd instructions, left out of line to lower the size of the Inst
/// enum.
#[derive(Clone, Debug)]
pub struct CallIndInfo {
pub rn: Reg,
pub uses: Vec<Reg>,
pub defs: Vec<Writable<Reg>>,
pub loc: SourceLoc,
pub opcode: Opcode,
}
/// Additional information for JTSequence instructions, left out of line to lower the size of the Inst
/// enum.
#[derive(Clone, Debug)]
pub struct JTSequenceInfo {
pub targets: Vec<BranchTarget>,
pub default_target: BranchTarget,
pub targets_for_term: Vec<MachLabel>, // needed for MachTerminator.
}
/// Instruction formats.
#[derive(Clone, Debug)]
pub enum Inst {
/// A no-op of zero size.
Nop0,
/// A no-op that is one instruction large.
Nop4,
/// An ALU operation with two register sources and a register destination.
AluRRR {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
},
/// An ALU operation with three register sources and a register destination.
AluRRRR {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
ra: Reg,
},
/// An ALU operation with a register source and an immediate-12 source, and a register
/// destination.
AluRRImm12 {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
imm12: Imm12,
},
/// An ALU operation with a register source and an immediate-logic source, and a register destination.
AluRRImmLogic {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
imml: ImmLogic,
},
/// An ALU operation with a register source and an immediate-shiftamt source, and a register destination.
AluRRImmShift {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
immshift: ImmShift,
},
/// An ALU operation with two register sources, one of which can be shifted, and a register
/// destination.
AluRRRShift {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
shiftop: ShiftOpAndAmt,
},
/// An ALU operation with two register sources, one of which can be {zero,sign}-extended and
/// shifted, and a register destination.
AluRRRExtend {
alu_op: ALUOp,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
extendop: ExtendOp,
},
/// A bit op instruction with a single register source.
BitRR {
op: BitOp,
rd: Writable<Reg>,
rn: Reg,
},
/// An unsigned (zero-extending) 8-bit load.
ULoad8 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A signed (sign-extending) 8-bit load.
SLoad8 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// An unsigned (zero-extending) 16-bit load.
ULoad16 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A signed (sign-extending) 16-bit load.
SLoad16 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// An unsigned (zero-extending) 32-bit load.
ULoad32 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A signed (sign-extending) 32-bit load.
SLoad32 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A 64-bit load.
ULoad64 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// An 8-bit store.
Store8 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A 16-bit store.
Store16 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A 32-bit store.
Store32 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A 64-bit store.
Store64 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// A store of a pair of registers.
StoreP64 {
rt: Reg,
rt2: Reg,
mem: PairMemArg,
},
/// A load of a pair of registers.
LoadP64 {
rt: Writable<Reg>,
rt2: Writable<Reg>,
mem: PairMemArg,
},
/// A MOV instruction. These are encoded as ORR's (AluRRR form) but we
/// keep them separate at the `Inst` level for better pretty-printing
/// and faster `is_move()` logic.
Mov {
rd: Writable<Reg>,
rm: Reg,
},
/// A 32-bit MOV. Zeroes the top 32 bits of the destination. This is
/// effectively an alias for an unsigned 32-to-64-bit extension.
Mov32 {
rd: Writable<Reg>,
rm: Reg,
},
/// A MOVZ with a 16-bit immediate.
MovZ {
rd: Writable<Reg>,
imm: MoveWideConst,
},
/// A MOVN with a 16-bit immediate.
MovN {
rd: Writable<Reg>,
imm: MoveWideConst,
},
/// A MOVK with a 16-bit immediate.
MovK {
rd: Writable<Reg>,
imm: MoveWideConst,
},
/// A sign- or zero-extend operation.
Extend {
rd: Writable<Reg>,
rn: Reg,
signed: bool,
from_bits: u8,
to_bits: u8,
},
/// A conditional-select operation.
CSel {
rd: Writable<Reg>,
cond: Cond,
rn: Reg,
rm: Reg,
},
/// A conditional-set operation.
CSet {
rd: Writable<Reg>,
cond: Cond,
},
/// A conditional comparison with an immediate.
CCmpImm {
size: InstSize,
rn: Reg,
imm: UImm5,
nzcv: NZCV,
cond: Cond,
},
/// FPU move. Note that this is distinct from a vector-register
/// move; moving just 64 bits seems to be significantly faster.
FpuMove64 {
rd: Writable<Reg>,
rn: Reg,
},
/// Vector register move.
FpuMove128 {
rd: Writable<Reg>,
rn: Reg,
},
/// Move to scalar from a vector element.
FpuMoveFromVec {
rd: Writable<Reg>,
rn: Reg,
idx: u8,
ty: Type,
},
/// 1-op FPU instruction.
FpuRR {
fpu_op: FPUOp1,
rd: Writable<Reg>,
rn: Reg,
},
/// 2-op FPU instruction.
FpuRRR {
fpu_op: FPUOp2,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
},
FpuRRI {
fpu_op: FPUOpRI,
rd: Writable<Reg>,
rn: Reg,
},
/// 3-op FPU instruction.
FpuRRRR {
fpu_op: FPUOp3,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
ra: Reg,
},
/// FPU comparison, single-precision (32 bit).
FpuCmp32 {
rn: Reg,
rm: Reg,
},
/// FPU comparison, double-precision (64 bit).
FpuCmp64 {
rn: Reg,
rm: Reg,
},
/// Floating-point load, single-precision (32 bit).
FpuLoad32 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// Floating-point store, single-precision (32 bit).
FpuStore32 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// Floating-point load, double-precision (64 bit).
FpuLoad64 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// Floating-point store, double-precision (64 bit).
FpuStore64 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// Floating-point/vector load, 128 bit.
FpuLoad128 {
rd: Writable<Reg>,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
/// Floating-point/vector store, 128 bit.
FpuStore128 {
rd: Reg,
mem: MemArg,
srcloc: Option<SourceLoc>,
},
LoadFpuConst32 {
rd: Writable<Reg>,
const_data: f32,
},
LoadFpuConst64 {
rd: Writable<Reg>,
const_data: f64,
},
LoadFpuConst128 {
rd: Writable<Reg>,
const_data: u128,
},
/// Conversion: FP -> integer.
FpuToInt {
op: FpuToIntOp,
rd: Writable<Reg>,
rn: Reg,
},
/// Conversion: integer -> FP.
IntToFpu {
op: IntToFpuOp,
rd: Writable<Reg>,
rn: Reg,
},
/// FP conditional select, 32 bit.
FpuCSel32 {
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
cond: Cond,
},
/// FP conditional select, 64 bit.
FpuCSel64 {
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
cond: Cond,
},
/// Round to integer.
FpuRound {
op: FpuRoundMode,
rd: Writable<Reg>,
rn: Reg,
},
/// Move to a vector register from a GPR.
MovToVec64 {
rd: Writable<Reg>,
rn: Reg,
},
/// Move to a GPR from a vector element.
MovFromVec {
rd: Writable<Reg>,
rn: Reg,
idx: u8,
ty: Type,
},
/// Duplicate general-purpose register to vector.
VecDup {
rd: Writable<Reg>,
rn: Reg,
ty: Type,
},
/// Duplicate scalar to vector.
VecDupFromFpu {
rd: Writable<Reg>,
rn: Reg,
ty: Type,
},
/// Vector extend.
VecExtend {
t: VecExtendOp,
rd: Writable<Reg>,
rn: Reg,
},
/// A vector ALU op.
VecRRR {
alu_op: VecALUOp,
rd: Writable<Reg>,
rn: Reg,
rm: Reg,
ty: Type,
},
/// Vector two register miscellaneous instruction.
VecMisc {
op: VecMisc2,
rd: Writable<Reg>,
rn: Reg,
ty: Type,
},
/// Vector instruction across lanes.
VecLanes {
op: VecLanesOp,
rd: Writable<Reg>,
rn: Reg,
ty: Type,
},
/// Move to the NZCV flags (actually a `MSR NZCV, Xn` insn).
MovToNZCV {
rn: Reg,
},
/// Move from the NZCV flags (actually a `MRS Xn, NZCV` insn).
MovFromNZCV {
rd: Writable<Reg>,
},
/// Set a register to 1 if condition, else 0.
CondSet {
rd: Writable<Reg>,
cond: Cond,
},
/// A machine call instruction. N.B.: this allows only a +/- 128MB offset (it uses a relocation
/// of type `Reloc::Arm64Call`); if the destination distance is not `RelocDistance::Near`, the
/// code should use a `LoadExtName` / `CallInd` sequence instead, allowing an arbitrary 64-bit
/// target.
Call {
info: Box<CallInfo>,
},
/// A machine indirect-call instruction.
CallInd {
info: Box<CallIndInfo>,
},
// ---- branches (exactly one must appear at end of BB) ----
/// A machine return instruction.
Ret,
/// A placeholder instruction, generating no code, meaning that a function epilogue must be
/// inserted there.
EpiloguePlaceholder,
/// An unconditional branch.
Jump {
dest: BranchTarget,
},
/// A conditional branch. Contains two targets; at emission time, both are emitted, but
/// the MachBuffer knows to truncate the trailing branch if fallthrough. We optimize the
/// choice of taken/not_taken (inverting the branch polarity as needed) based on the
/// fallthrough at the time of lowering.
CondBr {
taken: BranchTarget,
not_taken: BranchTarget,
kind: CondBrKind,
},
/// A conditional trap: execute a `udf` if the condition is true. This is
/// one VCode instruction because it uses embedded control flow; it is
/// logically a single-in, single-out region, but needs to appear as one
/// unit to the register allocator.
///
/// The `CondBrKind` gives the conditional-branch condition that will
/// *execute* the embedded `Inst`. (In the emitted code, we use the inverse
/// of this condition in a branch that skips the trap instruction.)
TrapIf {
kind: CondBrKind,
trap_info: (SourceLoc, TrapCode),
},
/// An indirect branch through a register, augmented with set of all
/// possible successors.
IndirectBr {
rn: Reg,
targets: Vec<MachLabel>,
},
/// A "break" instruction, used for e.g. traps and debug breakpoints.
Brk,
/// An instruction guaranteed to always be undefined and to trigger an illegal instruction at
/// runtime.
Udf {
trap_info: (SourceLoc, TrapCode),
},
/// Compute the address (using a PC-relative offset) of a memory location, using the `ADR`
/// instruction. Note that we take a simple offset, not a `MemLabel`, here, because `Adr` is
/// only used for now in fixed lowering sequences with hardcoded offsets. In the future we may
/// need full `MemLabel` support.
Adr {
rd: Writable<Reg>,
/// Offset in range -2^20 .. 2^20.
off: i32,
},
/// Raw 32-bit word, used for inline constants and jump-table entries.
Word4 {
data: u32,
},
/// Raw 64-bit word, used for inline constants.
Word8 {
data: u64,
},
/// Jump-table sequence, as one compound instruction (see note in lower_inst.rs for rationale).
JTSequence {
info: Box<JTSequenceInfo>,
ridx: Reg,
rtmp1: Writable<Reg>,
rtmp2: Writable<Reg>,
},
/// Load an inline constant.
LoadConst64 {
rd: Writable<Reg>,
const_data: u64,
},
/// Load an inline symbol reference.
LoadExtName {
rd: Writable<Reg>,
name: Box<ExternalName>,
srcloc: SourceLoc,
offset: i64,
},
/// Load address referenced by `mem` into `rd`.
LoadAddr {
rd: Writable<Reg>,
mem: MemArg,
},
/// Marker, no-op in generated code: SP "virtual offset" is adjusted. This
/// controls how MemArg::NominalSPOffset args are lowered.
VirtualSPOffsetAdj {
offset: i64,
},
/// Meta-insn, no-op in generated code: emit constant/branch veneer island
/// at this point (with a guard jump around it) if less than the needed
/// space is available before the next branch deadline. See the `MachBuffer`
/// implementation in `machinst/buffer.rs` for the overall algorithm. In
/// brief, we retain a set of "pending/unresolved label references" from
/// branches as we scan forward through instructions to emit machine code;
/// if we notice we're about to go out of range on an unresolved reference,
/// we stop, emit a bunch of "veneers" (branches in a form that has a longer
/// range, e.g. a 26-bit-offset unconditional jump), and point the original
/// label references to those. This is an "island" because it comes in the
/// middle of the code.
///
/// This meta-instruction is a necessary part of the logic that determines
/// where to place islands. Ordinarily, we want to place them between basic
/// blocks, so we compute the worst-case size of each block, and emit the
/// island before starting a block if we would exceed a deadline before the
/// end of the block. However, some sequences (such as an inline jumptable)
/// are variable-length and not accounted for by this logic; so these
/// lowered sequences include an `EmitIsland` to trigger island generation
/// where necessary.
EmitIsland {
/// The needed space before the next deadline.
needed_space: CodeOffset,
},
}
fn count_zero_half_words(mut value: u64) -> usize {
let mut count = 0;
for _ in 0..4 {
if value & 0xffff == 0 {
count += 1;
}
value >>= 16;
}
count
}
#[test]
fn inst_size_test() {
// This test will help with unintentionally growing the size
// of the Inst enum.
assert_eq!(32, std::mem::size_of::<Inst>());
}
impl Inst {
/// Create a move instruction.
pub fn mov(to_reg: Writable<Reg>, from_reg: Reg) -> Inst {
assert!(to_reg.to_reg().get_class() == from_reg.get_class());
if from_reg.get_class() == RegClass::I64 {
Inst::Mov {
rd: to_reg,
rm: from_reg,
}
} else if from_reg.get_class() == RegClass::V128 {
Inst::FpuMove128 {
rd: to_reg,
rn: from_reg,
}
} else {
Inst::FpuMove64 {
rd: to_reg,
rn: from_reg,
}
}
}
/// Create a 32-bit move instruction.
pub fn mov32(to_reg: Writable<Reg>, from_reg: Reg) -> Inst {
Inst::Mov32 {
rd: to_reg,
rm: from_reg,
}
}
/// Create an instruction that loads a constant, using one of serveral options (MOVZ, MOVN,
/// logical immediate, or constant pool).
pub fn load_constant(rd: Writable<Reg>, value: u64) -> SmallVec<[Inst; 4]> {
if let Some(imm) = MoveWideConst::maybe_from_u64(value) {
// 16-bit immediate (shifted by 0, 16, 32 or 48 bits) in MOVZ
smallvec![Inst::MovZ { rd, imm }]
} else if let Some(imm) = MoveWideConst::maybe_from_u64(!value) {
// 16-bit immediate (shifted by 0, 16, 32 or 48 bits) in MOVN
smallvec![Inst::MovN { rd, imm }]
} else if let Some(imml) = ImmLogic::maybe_from_u64(value, I64) {
// Weird logical-instruction immediate in ORI using zero register
smallvec![Inst::AluRRImmLogic {
alu_op: ALUOp::Orr64,
rd,
rn: zero_reg(),
imml,
}]
} else {
let mut insts = smallvec![];
// If the number of 0xffff half words is greater than the number of 0x0000 half words
// it is more efficient to use `movn` for the first instruction.
let first_is_inverted = count_zero_half_words(!value) > count_zero_half_words(value);
// Either 0xffff or 0x0000 half words can be skipped, depending on the first
// instruction used.
let ignored_halfword = if first_is_inverted { 0xffff } else { 0 };
let mut first_mov_emitted = false;
for i in 0..4 {
let imm16 = (value >> (16 * i)) & 0xffff;
if imm16 != ignored_halfword {
if !first_mov_emitted {
first_mov_emitted = true;
if first_is_inverted {
let imm =
MoveWideConst::maybe_with_shift(((!imm16) & 0xffff) as u16, i * 16)
.unwrap();
insts.push(Inst::MovN { rd, imm });
} else {
let imm =
MoveWideConst::maybe_with_shift(imm16 as u16, i * 16).unwrap();
insts.push(Inst::MovZ { rd, imm });
}
} else {
let imm = MoveWideConst::maybe_with_shift(imm16 as u16, i * 16).unwrap();
insts.push(Inst::MovK { rd, imm });
}
}
}
assert!(first_mov_emitted);
insts
}
}
/// Create an instruction that loads a 32-bit floating-point constant.
pub fn load_fp_constant32(rd: Writable<Reg>, value: f32) -> Inst {
// TODO: use FMOV immediate form when `value` has sufficiently few mantissa/exponent bits.
Inst::LoadFpuConst32 {
rd,
const_data: value,
}
}
/// Create an instruction that loads a 64-bit floating-point constant.
pub fn load_fp_constant64(rd: Writable<Reg>, value: f64) -> Inst {
// TODO: use FMOV immediate form when `value` has sufficiently few mantissa/exponent bits.
Inst::LoadFpuConst64 {
rd,
const_data: value,
}
}
/// Create an instruction that loads a 128-bit vector constant.
pub fn load_fp_constant128(rd: Writable<Reg>, value: u128) -> Inst {
Inst::LoadFpuConst128 {
rd,
const_data: value,
}
}
}
//=============================================================================
// Instructions: get_regs
fn memarg_regs(memarg: &MemArg, collector: &mut RegUsageCollector) {
match memarg {
&MemArg::Unscaled(reg, ..) | &MemArg::UnsignedOffset(reg, ..) => {
collector.add_use(reg);
}
&MemArg::RegReg(r1, r2, ..)
| &MemArg::RegScaled(r1, r2, ..)
| &MemArg::RegScaledExtended(r1, r2, ..)
| &MemArg::RegExtended(r1, r2, ..) => {
collector.add_use(r1);
collector.add_use(r2);
}
&MemArg::Label(..) => {}
&MemArg::PreIndexed(reg, ..) | &MemArg::PostIndexed(reg, ..) => {
collector.add_mod(reg);
}
&MemArg::FPOffset(..) => {
collector.add_use(fp_reg());
}
&MemArg::SPOffset(..) | &MemArg::NominalSPOffset(..) => {
collector.add_use(stack_reg());
}
&MemArg::RegOffset(r, ..) => {
collector.add_use(r);
}
}
}
fn pairmemarg_regs(pairmemarg: &PairMemArg, collector: &mut RegUsageCollector) {
match pairmemarg {
&PairMemArg::SignedOffset(reg, ..) => {
collector.add_use(reg);
}
&PairMemArg::PreIndexed(reg, ..) | &PairMemArg::PostIndexed(reg, ..) => {
collector.add_mod(reg);
}
}
}
fn aarch64_get_regs(inst: &Inst, collector: &mut RegUsageCollector) {
match inst {
&Inst::AluRRR { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::AluRRRR { rd, rn, rm, ra, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
collector.add_use(ra);
}
&Inst::AluRRImm12 { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::AluRRImmLogic { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::AluRRImmShift { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::AluRRRShift { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::AluRRRExtend { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::BitRR { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::ULoad8 { rd, ref mem, .. }
| &Inst::SLoad8 { rd, ref mem, .. }
| &Inst::ULoad16 { rd, ref mem, .. }
| &Inst::SLoad16 { rd, ref mem, .. }
| &Inst::ULoad32 { rd, ref mem, .. }
| &Inst::SLoad32 { rd, ref mem, .. }
| &Inst::ULoad64 { rd, ref mem, .. } => {
collector.add_def(rd);
memarg_regs(mem, collector);
}
&Inst::Store8 { rd, ref mem, .. }
| &Inst::Store16 { rd, ref mem, .. }
| &Inst::Store32 { rd, ref mem, .. }
| &Inst::Store64 { rd, ref mem, .. } => {
collector.add_use(rd);
memarg_regs(mem, collector);
}
&Inst::StoreP64 {
rt, rt2, ref mem, ..
} => {
collector.add_use(rt);
collector.add_use(rt2);
pairmemarg_regs(mem, collector);
}
&Inst::LoadP64 {
rt, rt2, ref mem, ..
} => {
collector.add_def(rt);
collector.add_def(rt2);
pairmemarg_regs(mem, collector);
}
&Inst::Mov { rd, rm } => {
collector.add_def(rd);
collector.add_use(rm);
}
&Inst::Mov32 { rd, rm } => {
collector.add_def(rd);
collector.add_use(rm);
}
&Inst::MovZ { rd, .. } | &Inst::MovN { rd, .. } => {
collector.add_def(rd);
}
&Inst::MovK { rd, .. } => {
collector.add_mod(rd);
}
&Inst::CSel { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::CSet { rd, .. } => {
collector.add_def(rd);
}
&Inst::CCmpImm { rn, .. } => {
collector.add_use(rn);
}
&Inst::FpuMove64 { rd, rn } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuMove128 { rd, rn } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuMoveFromVec { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuRR { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuRRR { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::FpuRRI { fpu_op, rd, rn, .. } => {
match fpu_op {
FPUOpRI::UShr32(..) | FPUOpRI::UShr64(..) => collector.add_def(rd),
FPUOpRI::Sli32(..) | FPUOpRI::Sli64(..) => collector.add_mod(rd),
}
collector.add_use(rn);
}
&Inst::FpuRRRR { rd, rn, rm, ra, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
collector.add_use(ra);
}
&Inst::VecMisc { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::VecLanes { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuCmp32 { rn, rm } | &Inst::FpuCmp64 { rn, rm } => {
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::FpuLoad32 { rd, ref mem, .. } => {
collector.add_def(rd);
memarg_regs(mem, collector);
}
&Inst::FpuLoad64 { rd, ref mem, .. } => {
collector.add_def(rd);
memarg_regs(mem, collector);
}
&Inst::FpuLoad128 { rd, ref mem, .. } => {
collector.add_def(rd);
memarg_regs(mem, collector);
}
&Inst::FpuStore32 { rd, ref mem, .. } => {
collector.add_use(rd);
memarg_regs(mem, collector);
}
&Inst::FpuStore64 { rd, ref mem, .. } => {
collector.add_use(rd);
memarg_regs(mem, collector);
}
&Inst::FpuStore128 { rd, ref mem, .. } => {
collector.add_use(rd);
memarg_regs(mem, collector);
}
&Inst::LoadFpuConst32 { rd, .. }
| &Inst::LoadFpuConst64 { rd, .. }
| &Inst::LoadFpuConst128 { rd, .. } => {
collector.add_def(rd);
}
&Inst::FpuToInt { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::IntToFpu { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::FpuCSel32 { rd, rn, rm, .. } | &Inst::FpuCSel64 { rd, rn, rm, .. } => {
collector.add_def(rd);
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::FpuRound { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::MovToVec64 { rd, rn } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::MovFromVec { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::VecDup { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::VecDupFromFpu { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::VecExtend { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::VecRRR {
alu_op, rd, rn, rm, ..
} => {
if alu_op == VecALUOp::Bsl {
collector.add_mod(rd);
} else {
collector.add_def(rd);
}
collector.add_use(rn);
collector.add_use(rm);
}
&Inst::MovToNZCV { rn } => {
collector.add_use(rn);
}
&Inst::MovFromNZCV { rd } => {
collector.add_def(rd);
}
&Inst::CondSet { rd, .. } => {
collector.add_def(rd);
}
&Inst::Extend { rd, rn, .. } => {
collector.add_def(rd);
collector.add_use(rn);
}
&Inst::Jump { .. } | &Inst::Ret | &Inst::EpiloguePlaceholder => {}
&Inst::Call { ref info } => {
collector.add_uses(&*info.uses);
collector.add_defs(&*info.defs);
}
&Inst::CallInd { ref info } => {
collector.add_uses(&*info.uses);
collector.add_defs(&*info.defs);
collector.add_use(info.rn);
}
&Inst::CondBr { ref kind, .. } => match kind {
CondBrKind::Zero(rt) | CondBrKind::NotZero(rt) => {
collector.add_use(*rt);
}
CondBrKind::Cond(_) => {}
},
&Inst::IndirectBr { rn, .. } => {
collector.add_use(rn);
}
&Inst::Nop0 | Inst::Nop4 => {}
&Inst::Brk => {}
&Inst::Udf { .. } => {}
&Inst::TrapIf { ref kind, .. } => match kind {
CondBrKind::Zero(rt) | CondBrKind::NotZero(rt) => {
collector.add_use(*rt);
}
CondBrKind::Cond(_) => {}
},
&Inst::Adr { rd, .. } => {
collector.add_def(rd);
}
&Inst::Word4 { .. } | &Inst::Word8 { .. } => {}
&Inst::JTSequence {
ridx, rtmp1, rtmp2, ..
} => {
collector.add_use(ridx);
collector.add_def(rtmp1);
collector.add_def(rtmp2);
}
&Inst::LoadConst64 { rd, .. } | &Inst::LoadExtName { rd, .. } => {
collector.add_def(rd);
}
&Inst::LoadAddr { rd, mem: _ } => {
collector.add_def(rd);
}
&Inst::VirtualSPOffsetAdj { .. } => {}
&Inst::EmitIsland { .. } => {}
}
}
//=============================================================================
// Instructions: map_regs
fn aarch64_map_regs<RUM: RegUsageMapper>(inst: &mut Inst, mapper: &RUM) {
fn map_use<RUM: RegUsageMapper>(m: &RUM, r: &mut Reg) {
if r.is_virtual() {
let new = m.get_use(r.to_virtual_reg()).unwrap().to_reg();
*r = new;
}
}
fn map_def<RUM: RegUsageMapper>(m: &RUM, r: &mut Writable<Reg>) {
if r.to_reg().is_virtual() {
let new = m.get_def(r.to_reg().to_virtual_reg()).unwrap().to_reg();
*r = Writable::from_reg(new);
}
}
fn map_mod<RUM: RegUsageMapper>(m: &RUM, r: &mut Writable<Reg>) {
if r.to_reg().is_virtual() {
let new = m.get_mod(r.to_reg().to_virtual_reg()).unwrap().to_reg();
*r = Writable::from_reg(new);
}
}
fn map_mem<RUM: RegUsageMapper>(m: &RUM, mem: &mut MemArg) {
// N.B.: we take only the pre-map here, but this is OK because the
// only addressing modes that update registers (pre/post-increment on
// AArch64) both read and write registers, so they are "mods" rather
// than "defs", so must be the same in both the pre- and post-map.
match mem {
&mut MemArg::Unscaled(ref mut reg, ..) => map_use(m, reg),
&mut MemArg::UnsignedOffset(ref mut reg, ..) => map_use(m, reg),
&mut MemArg::RegReg(ref mut r1, ref mut r2)
| &mut MemArg::RegScaled(ref mut r1, ref mut r2, ..)
| &mut MemArg::RegScaledExtended(ref mut r1, ref mut r2, ..)
| &mut MemArg::RegExtended(ref mut r1, ref mut r2, ..) => {
map_use(m, r1);
map_use(m, r2);
}
&mut MemArg::Label(..) => {}
&mut MemArg::PreIndexed(ref mut r, ..) => map_mod(m, r),
&mut MemArg::PostIndexed(ref mut r, ..) => map_mod(m, r),
&mut MemArg::FPOffset(..)
| &mut MemArg::SPOffset(..)
| &mut MemArg::NominalSPOffset(..) => {}
&mut MemArg::RegOffset(ref mut r, ..) => map_use(m, r),
};
}
fn map_pairmem<RUM: RegUsageMapper>(m: &RUM, mem: &mut PairMemArg) {
match mem {
&mut PairMemArg::SignedOffset(ref mut reg, ..) => map_use(m, reg),
&mut PairMemArg::PreIndexed(ref mut reg, ..) => map_def(m, reg),
&mut PairMemArg::PostIndexed(ref mut reg, ..) => map_def(m, reg),
}
}
fn map_br<RUM: RegUsageMapper>(m: &RUM, br: &mut CondBrKind) {
match br {
&mut CondBrKind::Zero(ref mut reg) => map_use(m, reg),
&mut CondBrKind::NotZero(ref mut reg) => map_use(m, reg),
&mut CondBrKind::Cond(..) => {}
};
}
match inst {
&mut Inst::AluRRR {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::AluRRRR {
ref mut rd,
ref mut rn,
ref mut rm,
ref mut ra,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
map_use(mapper, ra);
}
&mut Inst::AluRRImm12 {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::AluRRImmLogic {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::AluRRImmShift {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::AluRRRShift {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::AluRRRExtend {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::BitRR {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::ULoad8 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::SLoad8 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::ULoad16 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::SLoad16 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::ULoad32 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::SLoad32 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::ULoad64 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::Store8 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::Store16 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::Store32 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::Store64 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::StoreP64 {
ref mut rt,
ref mut rt2,
ref mut mem,
} => {
map_use(mapper, rt);
map_use(mapper, rt2);
map_pairmem(mapper, mem);
}
&mut Inst::LoadP64 {
ref mut rt,
ref mut rt2,
ref mut mem,
} => {
map_def(mapper, rt);
map_def(mapper, rt2);
map_pairmem(mapper, mem);
}
&mut Inst::Mov {
ref mut rd,
ref mut rm,
} => {
map_def(mapper, rd);
map_use(mapper, rm);
}
&mut Inst::Mov32 {
ref mut rd,
ref mut rm,
} => {
map_def(mapper, rd);
map_use(mapper, rm);
}
&mut Inst::MovZ { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::MovN { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::MovK { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::CSel {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::CSet { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::CCmpImm { ref mut rn, .. } => {
map_use(mapper, rn);
}
&mut Inst::FpuMove64 {
ref mut rd,
ref mut rn,
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuMove128 {
ref mut rd,
ref mut rn,
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuMoveFromVec {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuRR {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuRRR {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::FpuRRI {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuRRRR {
ref mut rd,
ref mut rn,
ref mut rm,
ref mut ra,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
map_use(mapper, ra);
}
&mut Inst::VecMisc {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::VecLanes {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuCmp32 {
ref mut rn,
ref mut rm,
} => {
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::FpuCmp64 {
ref mut rn,
ref mut rm,
} => {
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::FpuLoad32 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::FpuLoad64 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::FpuLoad128 {
ref mut rd,
ref mut mem,
..
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::FpuStore32 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::FpuStore64 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::FpuStore128 {
ref mut rd,
ref mut mem,
..
} => {
map_use(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::LoadFpuConst32 { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::LoadFpuConst64 { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::LoadFpuConst128 { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::FpuToInt {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::IntToFpu {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::FpuCSel32 {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::FpuCSel64 {
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::FpuRound {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::MovToVec64 {
ref mut rd,
ref mut rn,
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::MovFromVec {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::VecDup {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::VecDupFromFpu {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::VecExtend {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::VecRRR {
alu_op,
ref mut rd,
ref mut rn,
ref mut rm,
..
} => {
if alu_op == VecALUOp::Bsl {
map_mod(mapper, rd);
} else {
map_def(mapper, rd);
}
map_use(mapper, rn);
map_use(mapper, rm);
}
&mut Inst::MovToNZCV { ref mut rn } => {
map_use(mapper, rn);
}
&mut Inst::MovFromNZCV { ref mut rd } => {
map_def(mapper, rd);
}
&mut Inst::CondSet { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::Extend {
ref mut rd,
ref mut rn,
..
} => {
map_def(mapper, rd);
map_use(mapper, rn);
}
&mut Inst::Jump { .. } => {}
&mut Inst::Call { ref mut info } => {
for r in info.uses.iter_mut() {
map_use(mapper, r);
}
for r in info.defs.iter_mut() {
map_def(mapper, r);
}
}
&mut Inst::Ret | &mut Inst::EpiloguePlaceholder => {}
&mut Inst::CallInd { ref mut info, .. } => {
for r in info.uses.iter_mut() {
map_use(mapper, r);
}
for r in info.defs.iter_mut() {
map_def(mapper, r);
}
map_use(mapper, &mut info.rn);
}
&mut Inst::CondBr { ref mut kind, .. } => {
map_br(mapper, kind);
}
&mut Inst::IndirectBr { ref mut rn, .. } => {
map_use(mapper, rn);
}
&mut Inst::Nop0 | &mut Inst::Nop4 | &mut Inst::Brk | &mut Inst::Udf { .. } => {}
&mut Inst::TrapIf { ref mut kind, .. } => {
map_br(mapper, kind);
}
&mut Inst::Adr { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::Word4 { .. } | &mut Inst::Word8 { .. } => {}
&mut Inst::JTSequence {
ref mut ridx,
ref mut rtmp1,
ref mut rtmp2,
..
} => {
map_use(mapper, ridx);
map_def(mapper, rtmp1);
map_def(mapper, rtmp2);
}
&mut Inst::LoadConst64 { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::LoadExtName { ref mut rd, .. } => {
map_def(mapper, rd);
}
&mut Inst::LoadAddr {
ref mut rd,
ref mut mem,
} => {
map_def(mapper, rd);
map_mem(mapper, mem);
}
&mut Inst::VirtualSPOffsetAdj { .. } => {}
&mut Inst::EmitIsland { .. } => {}
}
}
//=============================================================================
// Instructions: misc functions and external interface
impl MachInst for Inst {
type LabelUse = LabelUse;
fn get_regs(&self, collector: &mut RegUsageCollector) {
aarch64_get_regs(self, collector)
}
fn map_regs<RUM: RegUsageMapper>(&mut self, mapper: &RUM) {
aarch64_map_regs(self, mapper);
}
fn is_move(&self) -> Option<(Writable<Reg>, Reg)> {
match self {
&Inst::Mov { rd, rm } => Some((rd, rm)),
&Inst::FpuMove64 { rd, rn } => Some((rd, rn)),
&Inst::FpuMove128 { rd, rn } => Some((rd, rn)),
_ => None,
}
}
fn is_epilogue_placeholder(&self) -> bool {
if let Inst::EpiloguePlaceholder = self {
true
} else {
false
}
}
fn is_term<'a>(&'a self) -> MachTerminator<'a> {
match self {
&Inst::Ret | &Inst::EpiloguePlaceholder => MachTerminator::Ret,
&Inst::Jump { dest } => MachTerminator::Uncond(dest.as_label().unwrap()),
&Inst::CondBr {
taken, not_taken, ..
} => MachTerminator::Cond(taken.as_label().unwrap(), not_taken.as_label().unwrap()),
&Inst::IndirectBr { ref targets, .. } => MachTerminator::Indirect(&targets[..]),
&Inst::JTSequence { ref info, .. } => {
MachTerminator::Indirect(&info.targets_for_term[..])
}
_ => MachTerminator::None,
}
}
fn gen_move(to_reg: Writable<Reg>, from_reg: Reg, ty: Type) -> Inst {
assert!(ty.bits() <= 128);
Inst::mov(to_reg, from_reg)
}
fn gen_constant(to_reg: Writable<Reg>, value: u64, ty: Type) -> SmallVec<[Inst; 4]> {
if ty == F64 {
let mut ret = SmallVec::new();
ret.push(Inst::load_fp_constant64(to_reg, f64::from_bits(value)));
ret
} else if ty == F32 {
let mut ret = SmallVec::new();
ret.push(Inst::load_fp_constant32(
to_reg,
f32::from_bits(value as u32),
));
ret
} else {
// Must be an integer type.
debug_assert!(
ty == B1
|| ty == I8
|| ty == B8
|| ty == I16
|| ty == B16
|| ty == I32
|| ty == B32
|| ty == I64
|| ty == B64
);
Inst::load_constant(to_reg, value)
}
}
fn gen_zero_len_nop() -> Inst {
Inst::Nop0
}
fn gen_nop(preferred_size: usize) -> Inst {
// We can't give a NOP (or any insn) < 4 bytes.
assert!(preferred_size >= 4);
Inst::Nop4
}
fn maybe_direct_reload(&self, _reg: VirtualReg, _slot: SpillSlot) -> Option<Inst> {
None
}
fn rc_for_type(ty: Type) -> CodegenResult<RegClass> {
match ty {
I8 | I16 | I32 | I64 | B1 | B8 | B16 | B32 | B64 => Ok(RegClass::I64),
F32 | F64 => Ok(RegClass::V128),
IFLAGS | FFLAGS => Ok(RegClass::I64),
B8X16 | I8X16 | B16X8 | I16X8 | B32X4 | I32X4 | B64X2 | I64X2 | F32X4 | F64X2 => {
Ok(RegClass::V128)
}
_ => Err(CodegenError::Unsupported(format!(
"Unexpected SSA-value type: {}",
ty
))),
}
}
fn gen_jump(target: MachLabel) -> Inst {
Inst::Jump {
dest: BranchTarget::Label(target),
}
}
fn reg_universe(flags: &settings::Flags) -> RealRegUniverse {
create_reg_universe(flags)
}
fn worst_case_size() -> CodeOffset {
// The maximum size, in bytes, of any `Inst`'s emitted code. We have at least one case of
// an 8-instruction sequence (saturating int-to-float conversions) with three embedded
// 64-bit f64 constants.
//
// Note that inline jump-tables handle island/pool insertion separately, so we do not need
// to account for them here (otherwise the worst case would be 2^31 * 4, clearly not
// feasible for other reasons).
44
}
}
//=============================================================================
// Pretty-printing of instructions.
fn mem_finalize_for_show(mem: &MemArg, mb_rru: Option<&RealRegUniverse>) -> (String, MemArg) {
let (mem_insts, mem) = mem_finalize(0, mem, &mut Default::default());
let mut mem_str = mem_insts
.into_iter()
.map(|inst| inst.show_rru(mb_rru))
.collect::<Vec<_>>()
.join(" ; ");
if !mem_str.is_empty() {
mem_str += " ; ";
}
(mem_str, mem)
}
impl ShowWithRRU for Inst {
fn show_rru(&self, mb_rru: Option<&RealRegUniverse>) -> String {
fn op_name_size(alu_op: ALUOp) -> (&'static str, InstSize) {
match alu_op {
ALUOp::Add32 => ("add", InstSize::Size32),
ALUOp::Add64 => ("add", InstSize::Size64),
ALUOp::Sub32 => ("sub", InstSize::Size32),
ALUOp::Sub64 => ("sub", InstSize::Size64),
ALUOp::Orr32 => ("orr", InstSize::Size32),
ALUOp::Orr64 => ("orr", InstSize::Size64),
ALUOp::And32 => ("and", InstSize::Size32),
ALUOp::And64 => ("and", InstSize::Size64),
ALUOp::Eor32 => ("eor", InstSize::Size32),
ALUOp::Eor64 => ("eor", InstSize::Size64),
ALUOp::AddS32 => ("adds", InstSize::Size32),
ALUOp::AddS64 => ("adds", InstSize::Size64),
ALUOp::SubS32 => ("subs", InstSize::Size32),
ALUOp::SubS64 => ("subs", InstSize::Size64),
ALUOp::SubS64XR => ("subs", InstSize::Size64),
ALUOp::MAdd32 => ("madd", InstSize::Size32),
ALUOp::MAdd64 => ("madd", InstSize::Size64),
ALUOp::MSub32 => ("msub", InstSize::Size32),
ALUOp::MSub64 => ("msub", InstSize::Size64),
ALUOp::SMulH => ("smulh", InstSize::Size64),
ALUOp::UMulH => ("umulh", InstSize::Size64),
ALUOp::SDiv64 => ("sdiv", InstSize::Size64),
ALUOp::UDiv64 => ("udiv", InstSize::Size64),
ALUOp::AndNot32 => ("bic", InstSize::Size32),
ALUOp::AndNot64 => ("bic", InstSize::Size64),
ALUOp::OrrNot32 => ("orn", InstSize::Size32),
ALUOp::OrrNot64 => ("orn", InstSize::Size64),
ALUOp::EorNot32 => ("eon", InstSize::Size32),
ALUOp::EorNot64 => ("eon", InstSize::Size64),
ALUOp::RotR32 => ("ror", InstSize::Size32),
ALUOp::RotR64 => ("ror", InstSize::Size64),
ALUOp::Lsr32 => ("lsr", InstSize::Size32),
ALUOp::Lsr64 => ("lsr", InstSize::Size64),
ALUOp::Asr32 => ("asr", InstSize::Size32),
ALUOp::Asr64 => ("asr", InstSize::Size64),
ALUOp::Lsl32 => ("lsl", InstSize::Size32),
ALUOp::Lsl64 => ("lsl", InstSize::Size64),
}
}
match self {
&Inst::Nop0 => "nop-zero-len".to_string(),
&Inst::Nop4 => "nop".to_string(),
&Inst::AluRRR { alu_op, rd, rn, rm } => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let rm = show_ireg_sized(rm, mb_rru, size);
format!("{} {}, {}, {}", op, rd, rn, rm)
}
&Inst::AluRRRR {
alu_op,
rd,
rn,
rm,
ra,
} => {
let (op, size) = op_name_size(alu_op);
let four_args = alu_op != ALUOp::SMulH && alu_op != ALUOp::UMulH;
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let rm = show_ireg_sized(rm, mb_rru, size);
let ra = show_ireg_sized(ra, mb_rru, size);
if four_args {
format!("{} {}, {}, {}, {}", op, rd, rn, rm, ra)
} else {
// smulh and umulh have Ra "hard-wired" to the zero register
// and the canonical assembly form has only three regs.
format!("{} {}, {}, {}", op, rd, rn, rm)
}
}
&Inst::AluRRImm12 {
alu_op,
rd,
rn,
ref imm12,
} => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
if imm12.bits == 0 && alu_op == ALUOp::Add64 {
// special-case MOV (used for moving into SP).
format!("mov {}, {}", rd, rn)
} else {
let imm12 = imm12.show_rru(mb_rru);
format!("{} {}, {}, {}", op, rd, rn, imm12)
}
}
&Inst::AluRRImmLogic {
alu_op,
rd,
rn,
ref imml,
} => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let imml = imml.show_rru(mb_rru);
format!("{} {}, {}, {}", op, rd, rn, imml)
}
&Inst::AluRRImmShift {
alu_op,
rd,
rn,
ref immshift,
} => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let immshift = immshift.show_rru(mb_rru);
format!("{} {}, {}, {}", op, rd, rn, immshift)
}
&Inst::AluRRRShift {
alu_op,
rd,
rn,
rm,
ref shiftop,
} => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let rm = show_ireg_sized(rm, mb_rru, size);
let shiftop = shiftop.show_rru(mb_rru);
format!("{} {}, {}, {}, {}", op, rd, rn, rm, shiftop)
}
&Inst::AluRRRExtend {
alu_op,
rd,
rn,
rm,
ref extendop,
} => {
let (op, size) = op_name_size(alu_op);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
let rm = show_ireg_sized(rm, mb_rru, size);
let extendop = extendop.show_rru(mb_rru);
format!("{} {}, {}, {}, {}", op, rd, rn, rm, extendop)
}
&Inst::BitRR { op, rd, rn } => {
let size = op.inst_size();
let op = op.op_str();
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let rn = show_ireg_sized(rn, mb_rru, size);
format!("{} {}, {}", op, rd, rn)
}
&Inst::ULoad8 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::SLoad8 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::ULoad16 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::SLoad16 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::ULoad32 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::SLoad32 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::ULoad64 {
rd,
ref mem,
srcloc: _srcloc,
..
} => {
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let is_unscaled = match &mem {
&MemArg::Unscaled(..) => true,
_ => false,
};
let (op, size) = match (self, is_unscaled) {
(&Inst::ULoad8 { .. }, false) => ("ldrb", InstSize::Size32),
(&Inst::ULoad8 { .. }, true) => ("ldurb", InstSize::Size32),
(&Inst::SLoad8 { .. }, false) => ("ldrsb", InstSize::Size64),
(&Inst::SLoad8 { .. }, true) => ("ldursb", InstSize::Size64),
(&Inst::ULoad16 { .. }, false) => ("ldrh", InstSize::Size32),
(&Inst::ULoad16 { .. }, true) => ("ldurh", InstSize::Size32),
(&Inst::SLoad16 { .. }, false) => ("ldrsh", InstSize::Size64),
(&Inst::SLoad16 { .. }, true) => ("ldursh", InstSize::Size64),
(&Inst::ULoad32 { .. }, false) => ("ldr", InstSize::Size32),
(&Inst::ULoad32 { .. }, true) => ("ldur", InstSize::Size32),
(&Inst::SLoad32 { .. }, false) => ("ldrsw", InstSize::Size64),
(&Inst::SLoad32 { .. }, true) => ("ldursw", InstSize::Size64),
(&Inst::ULoad64 { .. }, false) => ("ldr", InstSize::Size64),
(&Inst::ULoad64 { .. }, true) => ("ldur", InstSize::Size64),
_ => unreachable!(),
};
let rd = show_ireg_sized(rd.to_reg(), mb_rru, size);
let mem = mem.show_rru(mb_rru);
format!("{}{} {}, {}", mem_str, op, rd, mem)
}
&Inst::Store8 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::Store16 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::Store32 {
rd,
ref mem,
srcloc: _srcloc,
}
| &Inst::Store64 {
rd,
ref mem,
srcloc: _srcloc,
..
} => {
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let is_unscaled = match &mem {
&MemArg::Unscaled(..) => true,
_ => false,
};
let (op, size) = match (self, is_unscaled) {
(&Inst::Store8 { .. }, false) => ("strb", InstSize::Size32),
(&Inst::Store8 { .. }, true) => ("sturb", InstSize::Size32),
(&Inst::Store16 { .. }, false) => ("strh", InstSize::Size32),
(&Inst::Store16 { .. }, true) => ("sturh", InstSize::Size32),
(&Inst::Store32 { .. }, false) => ("str", InstSize::Size32),
(&Inst::Store32 { .. }, true) => ("stur", InstSize::Size32),
(&Inst::Store64 { .. }, false) => ("str", InstSize::Size64),
(&Inst::Store64 { .. }, true) => ("stur", InstSize::Size64),
_ => unreachable!(),
};
let rd = show_ireg_sized(rd, mb_rru, size);
let mem = mem.show_rru(mb_rru);
format!("{}{} {}, {}", mem_str, op, rd, mem)
}
&Inst::StoreP64 { rt, rt2, ref mem } => {
let rt = rt.show_rru(mb_rru);
let rt2 = rt2.show_rru(mb_rru);
let mem = mem.show_rru_sized(mb_rru, /* size = */ 8);
format!("stp {}, {}, {}", rt, rt2, mem)
}
&Inst::LoadP64 { rt, rt2, ref mem } => {
let rt = rt.to_reg().show_rru(mb_rru);
let rt2 = rt2.to_reg().show_rru(mb_rru);
let mem = mem.show_rru_sized(mb_rru, /* size = */ 8);
format!("ldp {}, {}, {}", rt, rt2, mem)
}
&Inst::Mov { rd, rm } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rm = rm.show_rru(mb_rru);
format!("mov {}, {}", rd, rm)
}
&Inst::Mov32 { rd, rm } => {
let rd = show_ireg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
let rm = show_ireg_sized(rm, mb_rru, InstSize::Size32);
format!("mov {}, {}", rd, rm)
}
&Inst::MovZ { rd, ref imm } => {
let rd = rd.to_reg().show_rru(mb_rru);
let imm = imm.show_rru(mb_rru);
format!("movz {}, {}", rd, imm)
}
&Inst::MovN { rd, ref imm } => {
let rd = rd.to_reg().show_rru(mb_rru);
let imm = imm.show_rru(mb_rru);
format!("movn {}, {}", rd, imm)
}
&Inst::MovK { rd, ref imm } => {
let rd = rd.to_reg().show_rru(mb_rru);
let imm = imm.show_rru(mb_rru);
format!("movk {}, {}", rd, imm)
}
&Inst::CSel { rd, rn, rm, cond } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rn = rn.show_rru(mb_rru);
let rm = rm.show_rru(mb_rru);
let cond = cond.show_rru(mb_rru);
format!("csel {}, {}, {}, {}", rd, rn, rm, cond)
}
&Inst::CSet { rd, cond } => {
let rd = rd.to_reg().show_rru(mb_rru);
let cond = cond.show_rru(mb_rru);
format!("cset {}, {}", rd, cond)
}
&Inst::CCmpImm {
size,
rn,
imm,
nzcv,
cond,
} => {
let rn = show_ireg_sized(rn, mb_rru, size);
let imm = imm.show_rru(mb_rru);
let nzcv = nzcv.show_rru(mb_rru);
let cond = cond.show_rru(mb_rru);
format!("ccmp {}, {}, {}, {}", rn, imm, nzcv, cond)
}
&Inst::FpuMove64 { rd, rn } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rn = rn.show_rru(mb_rru);
format!("mov {}.8b, {}.8b", rd, rn)
}
&Inst::FpuMove128 { rd, rn } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rn = rn.show_rru(mb_rru);
format!("mov {}.16b, {}.16b", rd, rn)
}
&Inst::FpuMoveFromVec { rd, rn, idx, ty } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::from_ty(ty));
let rn = show_vreg_element(rn, mb_rru, idx, ty);
format!("mov {}, {}", rd, rn)
}
&Inst::FpuRR { fpu_op, rd, rn } => {
let (op, sizesrc, sizedest) = match fpu_op {
FPUOp1::Abs32 => ("fabs", InstSize::Size32, InstSize::Size32),
FPUOp1::Abs64 => ("fabs", InstSize::Size64, InstSize::Size64),
FPUOp1::Neg32 => ("fneg", InstSize::Size32, InstSize::Size32),
FPUOp1::Neg64 => ("fneg", InstSize::Size64, InstSize::Size64),
FPUOp1::Sqrt32 => ("fsqrt", InstSize::Size32, InstSize::Size32),
FPUOp1::Sqrt64 => ("fsqrt", InstSize::Size64, InstSize::Size64),
FPUOp1::Cvt32To64 => ("fcvt", InstSize::Size32, InstSize::Size64),
FPUOp1::Cvt64To32 => ("fcvt", InstSize::Size64, InstSize::Size32),
};
let rd = show_freg_sized(rd.to_reg(), mb_rru, sizedest);
let rn = show_freg_sized(rn, mb_rru, sizesrc);
format!("{} {}, {}", op, rd, rn)
}
&Inst::FpuRRR { fpu_op, rd, rn, rm } => {
let (op, size) = match fpu_op {
FPUOp2::Add32 => ("fadd", InstSize::Size32),
FPUOp2::Add64 => ("fadd", InstSize::Size64),
FPUOp2::Sub32 => ("fsub", InstSize::Size32),
FPUOp2::Sub64 => ("fsub", InstSize::Size64),
FPUOp2::Mul32 => ("fmul", InstSize::Size32),
FPUOp2::Mul64 => ("fmul", InstSize::Size64),
FPUOp2::Div32 => ("fdiv", InstSize::Size32),
FPUOp2::Div64 => ("fdiv", InstSize::Size64),
FPUOp2::Max32 => ("fmax", InstSize::Size32),
FPUOp2::Max64 => ("fmax", InstSize::Size64),
FPUOp2::Min32 => ("fmin", InstSize::Size32),
FPUOp2::Min64 => ("fmin", InstSize::Size64),
};
let rd = show_freg_sized(rd.to_reg(), mb_rru, size);
let rn = show_freg_sized(rn, mb_rru, size);
let rm = show_freg_sized(rm, mb_rru, size);
format!("{} {}, {}, {}", op, rd, rn, rm)
}
&Inst::FpuRRI { fpu_op, rd, rn } => {
let (op, imm, vector) = match fpu_op {
FPUOpRI::UShr32(imm) => ("ushr", imm.show_rru(mb_rru), true),
FPUOpRI::UShr64(imm) => ("ushr", imm.show_rru(mb_rru), false),
FPUOpRI::Sli32(imm) => ("sli", imm.show_rru(mb_rru), true),
FPUOpRI::Sli64(imm) => ("sli", imm.show_rru(mb_rru), false),
};
let show_vreg_fn: fn(Reg, Option<&RealRegUniverse>) -> String = if vector {
|reg, mb_rru| show_vreg_vector(reg, mb_rru, F32X2)
} else {
|reg, mb_rru| show_vreg_scalar(reg, mb_rru, F64)
};
let rd = show_vreg_fn(rd.to_reg(), mb_rru);
let rn = show_vreg_fn(rn, mb_rru);
format!("{} {}, {}, {}", op, rd, rn, imm)
}
&Inst::FpuRRRR {
fpu_op,
rd,
rn,
rm,
ra,
} => {
let (op, size) = match fpu_op {
FPUOp3::MAdd32 => ("fmadd", InstSize::Size32),
FPUOp3::MAdd64 => ("fmadd", InstSize::Size64),
};
let rd = show_freg_sized(rd.to_reg(), mb_rru, size);
let rn = show_freg_sized(rn, mb_rru, size);
let rm = show_freg_sized(rm, mb_rru, size);
let ra = show_freg_sized(ra, mb_rru, size);
format!("{} {}, {}, {}, {}", op, rd, rn, rm, ra)
}
&Inst::FpuCmp32 { rn, rm } => {
let rn = show_freg_sized(rn, mb_rru, InstSize::Size32);
let rm = show_freg_sized(rm, mb_rru, InstSize::Size32);
format!("fcmp {}, {}", rn, rm)
}
&Inst::FpuCmp64 { rn, rm } => {
let rn = show_freg_sized(rn, mb_rru, InstSize::Size64);
let rm = show_freg_sized(rm, mb_rru, InstSize::Size64);
format!("fcmp {}, {}", rn, rm)
}
&Inst::FpuLoad32 { rd, ref mem, .. } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}ldr {}, {}", mem_str, rd, mem)
}
&Inst::FpuLoad64 { rd, ref mem, .. } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size64);
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}ldr {}, {}", mem_str, rd, mem)
}
&Inst::FpuLoad128 { rd, ref mem, .. } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rd = "q".to_string() + &rd[1..];
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}ldr {}, {}", mem_str, rd, mem)
}
&Inst::FpuStore32 { rd, ref mem, .. } => {
let rd = show_freg_sized(rd, mb_rru, InstSize::Size32);
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}str {}, {}", mem_str, rd, mem)
}
&Inst::FpuStore64 { rd, ref mem, .. } => {
let rd = show_freg_sized(rd, mb_rru, InstSize::Size64);
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}str {}, {}", mem_str, rd, mem)
}
&Inst::FpuStore128 { rd, ref mem, .. } => {
let rd = rd.show_rru(mb_rru);
let rd = "q".to_string() + &rd[1..];
let (mem_str, mem) = mem_finalize_for_show(mem, mb_rru);
let mem = mem.show_rru(mb_rru);
format!("{}str {}, {}", mem_str, rd, mem)
}
&Inst::LoadFpuConst32 { rd, const_data } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
format!("ldr {}, pc+8 ; b 8 ; data.f32 {}", rd, const_data)
}
&Inst::LoadFpuConst64 { rd, const_data } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size64);
format!("ldr {}, pc+8 ; b 12 ; data.f64 {}", rd, const_data)
}
&Inst::LoadFpuConst128 { rd, const_data } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size128);
format!("ldr {}, pc+8 ; b 20 ; data.f128 0x{:032x}", rd, const_data)
}
&Inst::FpuToInt { op, rd, rn } => {
let (op, sizesrc, sizedest) = match op {
FpuToIntOp::F32ToI32 => ("fcvtzs", InstSize::Size32, InstSize::Size32),
FpuToIntOp::F32ToU32 => ("fcvtzu", InstSize::Size32, InstSize::Size32),
FpuToIntOp::F32ToI64 => ("fcvtzs", InstSize::Size32, InstSize::Size64),
FpuToIntOp::F32ToU64 => ("fcvtzu", InstSize::Size32, InstSize::Size64),
FpuToIntOp::F64ToI32 => ("fcvtzs", InstSize::Size64, InstSize::Size32),
FpuToIntOp::F64ToU32 => ("fcvtzu", InstSize::Size64, InstSize::Size32),
FpuToIntOp::F64ToI64 => ("fcvtzs", InstSize::Size64, InstSize::Size64),
FpuToIntOp::F64ToU64 => ("fcvtzu", InstSize::Size64, InstSize::Size64),
};
let rd = show_ireg_sized(rd.to_reg(), mb_rru, sizedest);
let rn = show_freg_sized(rn, mb_rru, sizesrc);
format!("{} {}, {}", op, rd, rn)
}
&Inst::IntToFpu { op, rd, rn } => {
let (op, sizesrc, sizedest) = match op {
IntToFpuOp::I32ToF32 => ("scvtf", InstSize::Size32, InstSize::Size32),
IntToFpuOp::U32ToF32 => ("ucvtf", InstSize::Size32, InstSize::Size32),
IntToFpuOp::I64ToF32 => ("scvtf", InstSize::Size64, InstSize::Size32),
IntToFpuOp::U64ToF32 => ("ucvtf", InstSize::Size64, InstSize::Size32),
IntToFpuOp::I32ToF64 => ("scvtf", InstSize::Size32, InstSize::Size64),
IntToFpuOp::U32ToF64 => ("ucvtf", InstSize::Size32, InstSize::Size64),
IntToFpuOp::I64ToF64 => ("scvtf", InstSize::Size64, InstSize::Size64),
IntToFpuOp::U64ToF64 => ("ucvtf", InstSize::Size64, InstSize::Size64),
};
let rd = show_freg_sized(rd.to_reg(), mb_rru, sizedest);
let rn = show_ireg_sized(rn, mb_rru, sizesrc);
format!("{} {}, {}", op, rd, rn)
}
&Inst::FpuCSel32 { rd, rn, rm, cond } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
let rn = show_freg_sized(rn, mb_rru, InstSize::Size32);
let rm = show_freg_sized(rm, mb_rru, InstSize::Size32);
let cond = cond.show_rru(mb_rru);
format!("fcsel {}, {}, {}, {}", rd, rn, rm, cond)
}
&Inst::FpuCSel64 { rd, rn, rm, cond } => {
let rd = show_freg_sized(rd.to_reg(), mb_rru, InstSize::Size64);
let rn = show_freg_sized(rn, mb_rru, InstSize::Size64);
let rm = show_freg_sized(rm, mb_rru, InstSize::Size64);
let cond = cond.show_rru(mb_rru);
format!("fcsel {}, {}, {}, {}", rd, rn, rm, cond)
}
&Inst::FpuRound { op, rd, rn } => {
let (inst, size) = match op {
FpuRoundMode::Minus32 => ("frintm", InstSize::Size32),
FpuRoundMode::Minus64 => ("frintm", InstSize::Size64),
FpuRoundMode::Plus32 => ("frintp", InstSize::Size32),
FpuRoundMode::Plus64 => ("frintp", InstSize::Size64),
FpuRoundMode::Zero32 => ("frintz", InstSize::Size32),
FpuRoundMode::Zero64 => ("frintz", InstSize::Size64),
FpuRoundMode::Nearest32 => ("frintn", InstSize::Size32),
FpuRoundMode::Nearest64 => ("frintn", InstSize::Size64),
};
let rd = show_freg_sized(rd.to_reg(), mb_rru, size);
let rn = show_freg_sized(rn, mb_rru, size);
format!("{} {}, {}", inst, rd, rn)
}
&Inst::MovToVec64 { rd, rn } => {
let rd = rd.to_reg().show_rru(mb_rru);
let rn = rn.show_rru(mb_rru);
format!("mov {}.d[0], {}", rd, rn)
}
&Inst::MovFromVec { rd, rn, idx, ty } => {
let op = match ty {
I32 | I64 => "mov",
_ => "umov",
};
let rd = show_ireg_sized(rd.to_reg(), mb_rru, InstSize::from_ty(ty));
let rn = show_vreg_element(rn, mb_rru, idx, ty);
format!("{} {}, {}", op, rd, rn)
}
&Inst::VecDup { rd, rn, ty } => {
let vector_type = match ty {
I8 => I8X16,
I16 => I16X8,
I32 => I32X4,
I64 => I64X2,
_ => unimplemented!(),
};
let rd = show_vreg_vector(rd.to_reg(), mb_rru, vector_type);
let rn = show_ireg_sized(rn, mb_rru, InstSize::from_ty(ty));
format!("dup {}, {}", rd, rn)
}
&Inst::VecDupFromFpu { rd, rn, ty } => {
let vector_type = match ty {
F32 => F32X4,
F64 => F64X2,
_ => unimplemented!(),
};
let rd = show_vreg_vector(rd.to_reg(), mb_rru, vector_type);
let rn = show_vreg_element(rn, mb_rru, 0, ty);
format!("dup {}, {}", rd, rn)
}
&Inst::VecExtend { t, rd, rn } => {
let (op, dest, src) = match t {
VecExtendOp::Sxtl8 => ("sxtl", I16X8, I8X8),
VecExtendOp::Sxtl16 => ("sxtl", I32X4, I16X4),
VecExtendOp::Sxtl32 => ("sxtl", I64X2, I32X2),
VecExtendOp::Uxtl8 => ("uxtl", I16X8, I8X8),
VecExtendOp::Uxtl16 => ("uxtl", I32X4, I16X4),
VecExtendOp::Uxtl32 => ("uxtl", I64X2, I32X2),
};
let rd = show_vreg_vector(rd.to_reg(), mb_rru, dest);
let rn = show_vreg_vector(rn, mb_rru, src);
format!("{} {}, {}", op, rd, rn)
}
&Inst::VecRRR {
rd,
rn,
rm,
alu_op,
ty,
} => {
let (op, vector, ty) = match alu_op {
VecALUOp::SQAddScalar => ("sqadd", false, ty),
VecALUOp::Sqadd => ("sqadd", true, ty),
VecALUOp::UQAddScalar => ("uqadd", false, ty),
VecALUOp::Uqadd => ("uqadd", true, ty),
VecALUOp::SQSubScalar => ("sqsub", false, ty),
VecALUOp::Sqsub => ("sqsub", true, ty),
VecALUOp::UQSubScalar => ("uqsub", false, ty),
VecALUOp::Uqsub => ("uqsub", true, ty),
VecALUOp::Cmeq => ("cmeq", true, ty),
VecALUOp::Cmge => ("cmge", true, ty),
VecALUOp::Cmgt => ("cmgt", true, ty),
VecALUOp::Cmhs => ("cmhs", true, ty),
VecALUOp::Cmhi => ("cmhi", true, ty),
VecALUOp::Fcmeq => ("fcmeq", true, ty),
VecALUOp::Fcmgt => ("fcmgt", true, ty),
VecALUOp::Fcmge => ("fcmge", true, ty),
VecALUOp::And => ("and", true, I8X16),
VecALUOp::Bic => ("bic", true, I8X16),
VecALUOp::Orr => ("orr", true, I8X16),
VecALUOp::Eor => ("eor", true, I8X16),
VecALUOp::Bsl => ("bsl", true, I8X16),
VecALUOp::Umaxp => ("umaxp", true, ty),
VecALUOp::Add => ("add", true, ty),
VecALUOp::Sub => ("sub", true, ty),
VecALUOp::Mul => ("mul", true, ty),
VecALUOp::Sshl => ("sshl", true, ty),
VecALUOp::Ushl => ("ushl", true, ty),
};
let show_vreg_fn: fn(Reg, Option<&RealRegUniverse>, Type) -> String = if vector {
|reg, mb_rru, ty| show_vreg_vector(reg, mb_rru, ty)
} else {
|reg, mb_rru, _ty| show_vreg_scalar(reg, mb_rru, I64)
};
let rd = show_vreg_fn(rd.to_reg(), mb_rru, ty);
let rn = show_vreg_fn(rn, mb_rru, ty);
let rm = show_vreg_fn(rm, mb_rru, ty);
format!("{} {}, {}, {}", op, rd, rn, rm)
}
&Inst::VecMisc { op, rd, rn, ty } => {
let (op, ty) = match op {
VecMisc2::Not => ("mvn", I8X16),
VecMisc2::Neg => ("neg", ty),
};
let rd = show_vreg_vector(rd.to_reg(), mb_rru, ty);
let rn = show_vreg_vector(rn, mb_rru, ty);
format!("{} {}, {}", op, rd, rn)
}
&Inst::VecLanes { op, rd, rn, ty } => {
let op = match op {
VecLanesOp::Uminv => "uminv",
};
let rd = show_vreg_scalar(rd.to_reg(), mb_rru, ty);
let rn = show_vreg_vector(rn, mb_rru, ty);
format!("{} {}, {}", op, rd, rn)
}
&Inst::MovToNZCV { rn } => {
let rn = rn.show_rru(mb_rru);
format!("msr nzcv, {}", rn)
}
&Inst::MovFromNZCV { rd } => {
let rd = rd.to_reg().show_rru(mb_rru);
format!("mrs {}, nzcv", rd)
}
&Inst::CondSet { rd, cond } => {
let rd = rd.to_reg().show_rru(mb_rru);
let cond = cond.show_rru(mb_rru);
format!("cset {}, {}", rd, cond)
}
&Inst::Extend {
rd,
rn,
signed,
from_bits,
to_bits,
} if from_bits >= 8 => {
// Is the destination a 32-bit register? Corresponds to whether
// extend-to width is <= 32 bits, *unless* we have an unsigned
// 32-to-64-bit extension, which is implemented with a "mov" to a
// 32-bit (W-reg) dest, because this zeroes the top 32 bits.
let dest_size = if !signed && from_bits == 32 && to_bits == 64 {
InstSize::Size32
} else {
InstSize::from_bits(to_bits)
};
let rd = show_ireg_sized(rd.to_reg(), mb_rru, dest_size);
let rn = show_ireg_sized(rn, mb_rru, InstSize::from_bits(from_bits));
let op = match (signed, from_bits, to_bits) {
(false, 8, 32) => "uxtb",
(true, 8, 32) => "sxtb",
(false, 16, 32) => "uxth",
(true, 16, 32) => "sxth",
(false, 8, 64) => "uxtb",
(true, 8, 64) => "sxtb",
(false, 16, 64) => "uxth",
(true, 16, 64) => "sxth",
(false, 32, 64) => "mov", // special case (see above).
(true, 32, 64) => "sxtw",
_ => panic!("Unsupported Extend case: {:?}", self),
};
format!("{} {}, {}", op, rd, rn)
}
&Inst::Extend {
rd,
rn,
signed,
from_bits,
to_bits,
} if from_bits == 1 && signed => {
let dest_size = InstSize::from_bits(to_bits);
let zr = if dest_size.is32() { "wzr" } else { "xzr" };
let rd32 = show_ireg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
let rd = show_ireg_sized(rd.to_reg(), mb_rru, dest_size);
let rn = show_ireg_sized(rn, mb_rru, InstSize::Size32);
format!("and {}, {}, #1 ; sub {}, {}, {}", rd32, rn, rd, zr, rd)
}
&Inst::Extend {
rd,
rn,
signed,
from_bits,
..
} if from_bits == 1 && !signed => {
let rd = show_ireg_sized(rd.to_reg(), mb_rru, InstSize::Size32);
let rn = show_ireg_sized(rn, mb_rru, InstSize::Size32);
format!("and {}, {}, #1", rd, rn)
}
&Inst::Extend { .. } => {
panic!("Unsupported Extend case");
}
&Inst::Call { .. } => format!("bl 0"),
&Inst::CallInd { ref info, .. } => {
let rn = info.rn.show_rru(mb_rru);
format!("blr {}", rn)
}
&Inst::Ret => "ret".to_string(),
&Inst::EpiloguePlaceholder => "epilogue placeholder".to_string(),
&Inst::Jump { ref dest } => {
let dest = dest.show_rru(mb_rru);
format!("b {}", dest)
}
&Inst::CondBr {
ref taken,
ref not_taken,
ref kind,
} => {
let taken = taken.show_rru(mb_rru);
let not_taken = not_taken.show_rru(mb_rru);
match kind {
&CondBrKind::Zero(reg) => {
let reg = reg.show_rru(mb_rru);
format!("cbz {}, {} ; b {}", reg, taken, not_taken)
}
&CondBrKind::NotZero(reg) => {
let reg = reg.show_rru(mb_rru);
format!("cbnz {}, {} ; b {}", reg, taken, not_taken)
}
&CondBrKind::Cond(c) => {
let c = c.show_rru(mb_rru);
format!("b.{} {} ; b {}", c, taken, not_taken)
}
}
}
&Inst::IndirectBr { rn, .. } => {
let rn = rn.show_rru(mb_rru);
format!("br {}", rn)
}
&Inst::Brk => "brk #0".to_string(),
&Inst::Udf { .. } => "udf".to_string(),
&Inst::TrapIf { ref kind, .. } => match kind {
&CondBrKind::Zero(reg) => {
let reg = reg.show_rru(mb_rru);
format!("cbnz {}, 8 ; udf", reg)
}
&CondBrKind::NotZero(reg) => {
let reg = reg.show_rru(mb_rru);
format!("cbz {}, 8 ; udf", reg)
}
&CondBrKind::Cond(c) => {
let c = c.invert().show_rru(mb_rru);
format!("b.{} 8 ; udf", c)
}
},
&Inst::Adr { rd, off } => {
let rd = rd.show_rru(mb_rru);
format!("adr {}, pc+{}", rd, off)
}
&Inst::Word4 { data } => format!("data.i32 {}", data),
&Inst::Word8 { data } => format!("data.i64 {}", data),
&Inst::JTSequence {
ref info,
ridx,
rtmp1,
rtmp2,
..
} => {
let ridx = ridx.show_rru(mb_rru);
let rtmp1 = rtmp1.show_rru(mb_rru);
let rtmp2 = rtmp2.show_rru(mb_rru);
let default_target = info.default_target.show_rru(mb_rru);
format!(
concat!(
"b.hs {} ; ",
"adr {}, pc+16 ; ",
"ldrsw {}, [{}, {}, LSL 2] ; ",
"add {}, {}, {} ; ",
"br {} ; ",
"jt_entries {:?}"
),
default_target,
rtmp1,
rtmp2,
rtmp1,
ridx,
rtmp1,
rtmp1,
rtmp2,
rtmp1,
info.targets
)
}
&Inst::LoadConst64 { rd, const_data } => {
let rd = rd.show_rru(mb_rru);
format!("ldr {}, 8 ; b 12 ; data {:?}", rd, const_data)
}
&Inst::LoadExtName {
rd,
ref name,
offset,
srcloc: _srcloc,
} => {
let rd = rd.show_rru(mb_rru);
format!("ldr {}, 8 ; b 12 ; data {:?} + {}", rd, name, offset)
}
&Inst::LoadAddr { rd, ref mem } => {
// TODO: we really should find a better way to avoid duplication of
// this logic between `emit()` and `show_rru()` -- a separate 1-to-N
// expansion stage (i.e., legalization, but without the slow edit-in-place
// of the existing legalization framework).
let (mem_insts, mem) = mem_finalize(0, mem, &EmitState::default());
let mut ret = String::new();
for inst in mem_insts.into_iter() {
ret.push_str(&inst.show_rru(mb_rru));
}
let (reg, offset) = match mem {
MemArg::Unscaled(r, simm9) => (r, simm9.value()),
MemArg::UnsignedOffset(r, uimm12scaled) => (r, uimm12scaled.value() as i32),
_ => panic!("Unsupported case for LoadAddr: {:?}", mem),
};
let abs_offset = if offset < 0 {
-offset as u64
} else {
offset as u64
};
let alu_op = if offset < 0 {
ALUOp::Sub64
} else {
ALUOp::Add64
};
if offset == 0 {
let mov = Inst::mov(rd, reg);
ret.push_str(&mov.show_rru(mb_rru));
} else if let Some(imm12) = Imm12::maybe_from_u64(abs_offset) {
let add = Inst::AluRRImm12 {
alu_op,
rd,
rn: reg,
imm12,
};
ret.push_str(&add.show_rru(mb_rru));
} else {
let tmp = writable_spilltmp_reg();
for inst in Inst::load_constant(tmp, abs_offset).into_iter() {
ret.push_str(&inst.show_rru(mb_rru));
}
let add = Inst::AluRRR {
alu_op,
rd,
rn: reg,
rm: tmp.to_reg(),
};
ret.push_str(&add.show_rru(mb_rru));
}
ret
}
&Inst::VirtualSPOffsetAdj { offset } => format!("virtual_sp_offset_adjust {}", offset),
&Inst::EmitIsland { needed_space } => format!("emit_island {}", needed_space),
}
}
}
//=============================================================================
// Label fixups and jump veneers.
/// Different forms of label references for different instruction formats.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum LabelUse {
/// 19-bit branch offset (conditional branches). PC-rel, offset is imm << 2. Immediate is 19
/// signed bits, in bits 23:5. Used by cbz, cbnz, b.cond.
Branch19,
/// 26-bit branch offset (unconditional branches). PC-rel, offset is imm << 2. Immediate is 26
/// signed bits, in bits 25:0. Used by b, bl.
Branch26,
/// 19-bit offset for LDR (load literal). PC-rel, offset is imm << 2. Immediate is 19 signed bits,
/// in bits 23:5.
Ldr19,
/// 21-bit offset for ADR (get address of label). PC-rel, offset is not shifted. Immediate is
/// 21 signed bits, with high 19 bits in bits 23:5 and low 2 bits in bits 30:29.
Adr21,
/// 32-bit PC relative constant offset (from address of constant itself),
/// signed. Used in jump tables.
PCRel32,
}
impl MachInstLabelUse for LabelUse {
/// Alignment for veneer code. Every AArch64 instruction must be 4-byte-aligned.
const ALIGN: CodeOffset = 4;
/// Maximum PC-relative range (positive), inclusive.
fn max_pos_range(self) -> CodeOffset {
match self {
// 19-bit immediate, left-shifted by 2, for 21 bits of total range. Signed, so +2^20
// from zero. Likewise for two other shifted cases below.
LabelUse::Branch19 => (1 << 20) - 1,
LabelUse::Branch26 => (1 << 27) - 1,
LabelUse::Ldr19 => (1 << 20) - 1,
// Adr does not shift its immediate, so the 21-bit immediate gives 21 bits of total
// range.
LabelUse::Adr21 => (1 << 20) - 1,
LabelUse::PCRel32 => 0x7fffffff,
}
}
/// Maximum PC-relative range (negative).
fn max_neg_range(self) -> CodeOffset {
// All forms are twos-complement signed offsets, so negative limit is one more than
// positive limit.
self.max_pos_range() + 1
}
/// Size of window into code needed to do the patch.
fn patch_size(self) -> CodeOffset {
// Patch is on one instruction only for all of these label reference types.
4
}
/// Perform the patch.
fn patch(self, buffer: &mut [u8], use_offset: CodeOffset, label_offset: CodeOffset) {
let pc_rel = (label_offset as i64) - (use_offset as i64);
debug_assert!(pc_rel <= self.max_pos_range() as i64);
debug_assert!(pc_rel >= -(self.max_neg_range() as i64));
let pc_rel = pc_rel as u32;
let insn_word = u32::from_le_bytes([buffer[0], buffer[1], buffer[2], buffer[3]]);
let mask = match self {
LabelUse::Branch19 => 0x00ffffe0, // bits 23..5 inclusive
LabelUse::Branch26 => 0x03ffffff, // bits 25..0 inclusive
LabelUse::Ldr19 => 0x00ffffe0, // bits 23..5 inclusive
LabelUse::Adr21 => 0x60ffffe0, // bits 30..29, 25..5 inclusive
LabelUse::PCRel32 => 0xffffffff,
};
let pc_rel_shifted = match self {
LabelUse::Adr21 | LabelUse::PCRel32 => pc_rel,
_ => {
debug_assert!(pc_rel & 3 == 0);
pc_rel >> 2
}
};
let pc_rel_inserted = match self {
LabelUse::Branch19 | LabelUse::Ldr19 => (pc_rel_shifted & 0x7ffff) << 5,
LabelUse::Branch26 => pc_rel_shifted & 0x3ffffff,
LabelUse::Adr21 => (pc_rel_shifted & 0x7ffff) << 5 | (pc_rel_shifted & 0x180000) << 10,
LabelUse::PCRel32 => pc_rel_shifted,
};
let is_add = match self {
LabelUse::PCRel32 => true,
_ => false,
};
let insn_word = if is_add {
insn_word.wrapping_add(pc_rel_inserted)
} else {
(insn_word & !mask) | pc_rel_inserted
};
buffer[0..4].clone_from_slice(&u32::to_le_bytes(insn_word));
}
/// Is a veneer supported for this label reference type?
fn supports_veneer(self) -> bool {
match self {
LabelUse::Branch19 => true, // veneer is a Branch26
_ => false,
}
}
/// How large is the veneer, if supported?
fn veneer_size(self) -> CodeOffset {
4
}
/// Generate a veneer into the buffer, given that this veneer is at `veneer_offset`, and return
/// an offset and label-use for the veneer's use of the original label.
fn generate_veneer(
self,
buffer: &mut [u8],
veneer_offset: CodeOffset,
) -> (CodeOffset, LabelUse) {
match self {
LabelUse::Branch19 => {
// veneer is a Branch26 (unconditional branch). Just encode directly here -- don't
// bother with constructing an Inst.
let insn_word = 0b000101 << 26;
buffer[0..4].clone_from_slice(&u32::to_le_bytes(insn_word));
(veneer_offset, LabelUse::Branch26)
}
_ => panic!("Unsupported label-reference type for veneer generation!"),
}
}
}
Reference in New Issue View Git Blame Copy Permalink