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Refactor the InstSize enum in the AArch64 backend

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The main issue with the InstSize enum was that it was used both for
GPR and SIMD & FP operands, even though machine instructions do not
mix them in general (as in a destination register is either a GPR
or not). As a result it had methods such as sf_bit() that made
sense only for one type of operand.

Another issue was that the enum name was not reflecting its purpose
accurately - it was meant to represent an instruction operand size,
not an instruction size, which is fixed in A64 (always 4 bytes).

Now the enum is split into one for GPR operands and another for
scalar SIMD & FP operands.

Copyright (c) 2020, Arm Limited.
This commit is contained in:
Anton Kirilov
2020-06-11 14:20:49 +01:00
parent 85ffc8f595
commit 79dfac5514
7 changed files with 268 additions and 231 deletions
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15
cranelift/codegen/src/isa/aarch64/inst/regs.rs
View File

@@ -1,7 +1,8 @@
//! AArch64 ISA definitions: registers.
use crate::ir::types::*;
use crate::isa::aarch64::inst::InstSize;
use crate::isa::aarch64::inst::OperandSize;
use crate::isa::aarch64::inst::ScalarSize;
use crate::machinst::*;
use crate::settings;
@@ -255,7 +256,7 @@ pub fn create_reg_universe(flags: &settings::Flags) -> RealRegUniverse {
/// If `ireg` denotes an I64-classed reg, make a best-effort attempt to show
/// its name at the 32-bit size.
pub fn show_ireg_sized(reg: Reg, mb_rru: Option<&RealRegUniverse>, size: InstSize) -> String {
pub fn show_ireg_sized(reg: Reg, mb_rru: Option<&RealRegUniverse>, size: OperandSize) -> String {
let mut s = reg.show_rru(mb_rru);
if reg.get_class() != RegClass::I64 || !size.is32() {
// We can't do any better.
@@ -277,15 +278,17 @@ pub fn show_ireg_sized(reg: Reg, mb_rru: Option<&RealRegUniverse>, size: InstSiz
}
/// Show a vector register.
pub fn show_freg_sized(reg: Reg, mb_rru: Option<&RealRegUniverse>, size: InstSize) -> String {
pub fn show_freg_sized(reg: Reg, mb_rru: Option<&RealRegUniverse>, size: ScalarSize) -> String {
let mut s = reg.show_rru(mb_rru);
if reg.get_class() != RegClass::V128 {
return s;
}
let prefix = match size {
InstSize::Size32 => "s",
InstSize::Size64 => "d",
InstSize::Size128 => "q",
ScalarSize::Size8 => "b",
ScalarSize::Size16 => "h",
ScalarSize::Size32 => "s",
ScalarSize::Size64 => "d",
ScalarSize::Size128 => "q",
};
s.replace_range(0..1, prefix);
s