peepmatic: Do not use paths in linear IR
Rather than using paths from the root instruction to the instruction we are matching against or checking if it is constant or whatever, use temporary variables. When we successfully match an instruction's opcode, we simultaneously define these temporaries for the instruction's operands. This is similar to how open-coding these matches in Rust would use `match` expressions with pattern matching to bind the operands to variables at the same time. This saves about 1.8% of instructions retired when Peepmatic is enabled.
This commit is contained in:
Nick Fitzgerald
@@ -14,14 +14,13 @@ use peepmatic_runtime::{
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cc::ConditionCode,
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instruction_set::InstructionSet,
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part::{Constant, Part},
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paths::Path,
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r#type::{BitWidth, Kind, Type},
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PeepholeOptimizations, PeepholeOptimizer,
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};
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use peepmatic_traits::TypingRules;
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use std::borrow::Cow;
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use std::boxed::Box;
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use std::convert::{TryFrom, TryInto};
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use std::iter;
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use std::ptr;
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use std::sync::atomic::{AtomicPtr, Ordering};
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@@ -573,35 +572,6 @@ fn intcc_to_peepmatic(cc: IntCC) -> ConditionCode {
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}
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}
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fn get_immediate(dfg: &DataFlowGraph, inst: Inst, i: usize) -> Part<ValueOrInst> {
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return match dfg[inst] {
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InstructionData::BinaryImm64 { imm, .. } if i == 0 => imm.into(),
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InstructionData::BranchIcmp { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::BranchInt { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::IntCompare { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::IntCompareImm { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::IntCompareImm { imm, .. } if i == 1 => imm.into(),
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InstructionData::IntCond { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::IntCondTrap { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::IntSelect { cond, .. } if i == 0 => intcc_to_peepmatic(cond).into(),
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InstructionData::UnaryBool { imm, .. } if i == 0 => {
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Constant::Bool(imm, BitWidth::Polymorphic).into()
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}
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InstructionData::UnaryImm { imm, .. } if i == 0 => imm.into(),
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ref otherwise => unsupported(otherwise),
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};
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#[inline(never)]
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#[cold]
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fn unsupported(data: &InstructionData) -> ! {
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panic!("unsupported instruction data: {:?}", data)
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}
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}
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fn get_argument(dfg: &DataFlowGraph, inst: Inst, i: usize) -> Option<Value> {
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dfg.inst_args(inst).get(i).copied()
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}
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fn peepmatic_ty_to_ir_ty(ty: Type, dfg: &DataFlowGraph, root: Inst) -> types::Type {
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match (ty.kind, bit_width(dfg, ty.bit_width, root)) {
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(Kind::Int, 8) => types::I8,
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@@ -681,39 +651,290 @@ unsafe impl<'a, 'b> InstructionSet<'b> for &'a dyn TargetIsa {
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}
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}
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fn get_part_at_path(
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fn operator<E>(
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&self,
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pos: &mut FuncCursor<'b>,
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root: ValueOrInst,
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path: Path,
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) -> Option<Part<ValueOrInst>> {
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// The root is path [0].
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debug_assert!(!path.0.is_empty());
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debug_assert_eq!(path.0[0], 0);
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let mut part = Part::Instruction(root);
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for p in path.0[1..].iter().copied() {
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let inst = part.as_instruction()?.resolve_inst(&pos.func.dfg)?;
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let operator = pos.func.dfg[inst].opcode();
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if p < operator.immediates_arity() {
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part = get_immediate(&pos.func.dfg, inst, p as usize);
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continue;
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value_or_inst: ValueOrInst,
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operands: &mut E,
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) -> Option<Opcode>
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where
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E: Extend<Part<Self::Instruction>>,
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{
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let inst = value_or_inst.resolve_inst(&pos.func.dfg)?;
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Some(match pos.func.dfg[inst] {
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InstructionData::Binary {
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opcode: opcode @ Opcode::Band,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Bor,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Bxor,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Iadd,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Ifcmp,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Imul,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Ishl,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Isub,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Rotl,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Rotr,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Sdiv,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Srem,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Sshr,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Udiv,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Urem,
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args,
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}
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| InstructionData::Binary {
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opcode: opcode @ Opcode::Ushr,
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args,
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} => {
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operands.extend(args.iter().map(|v| Part::Instruction((*v).into())));
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opcode
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}
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let arg = p - operator.immediates_arity();
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let arg = arg as usize;
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let value = get_argument(&pos.func.dfg, inst, arg)?;
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part = Part::Instruction(value.into());
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}
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InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::BandImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::BorImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::BxorImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::IaddImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::IfcmpImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::ImulImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::IrsubImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::IshlImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::RotlImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::RotrImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::SdivImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::SremImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::SshrImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::UdivImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::UremImm,
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imm,
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arg,
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}
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| InstructionData::BinaryImm64 {
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opcode: opcode @ Opcode::UshrImm,
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imm,
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arg,
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} => {
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operands.extend(
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iter::once(imm.into()).chain(iter::once(Part::Instruction(arg.into()))),
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);
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opcode
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}
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log::trace!("get_part_at_path({:?}) = {:?}", path, part);
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Some(part)
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}
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InstructionData::Branch {
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opcode: opcode @ Opcode::Brnz,
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ref args,
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destination: _,
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}
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| InstructionData::Branch {
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opcode: opcode @ Opcode::Brz,
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ref args,
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destination: _,
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} => {
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operands.extend(
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args.as_slice(&pos.func.dfg.value_lists)
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.iter()
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.map(|v| Part::Instruction((*v).into()))
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// NB: Peepmatic only knows about the condition, not any
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// of the arguments to the block, which are special
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// cased elsewhere, if/when we actually replace the
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// instruction.
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.take(1),
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);
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opcode
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}
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fn operator(&self, pos: &mut FuncCursor<'b>, value_or_inst: ValueOrInst) -> Option<Opcode> {
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let inst = value_or_inst.resolve_inst(&pos.func.dfg)?;
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Some(pos.func.dfg[inst].opcode())
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InstructionData::CondTrap {
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opcode: opcode @ Opcode::Trapnz,
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arg,
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code: _,
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}
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| InstructionData::CondTrap {
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opcode: opcode @ Opcode::Trapz,
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arg,
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code: _,
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} => {
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operands.extend(iter::once(Part::Instruction(arg.into())));
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opcode
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}
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InstructionData::IntCompare {
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opcode: opcode @ Opcode::Icmp,
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cond,
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args,
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} => {
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operands.extend(
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iter::once(intcc_to_peepmatic(cond).into())
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.chain(args.iter().map(|v| Part::Instruction((*v).into()))),
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);
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opcode
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}
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InstructionData::IntCompareImm {
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opcode: opcode @ Opcode::IcmpImm,
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cond,
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imm,
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arg,
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} => {
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operands.extend(
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iter::once(intcc_to_peepmatic(cond).into())
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.chain(iter::once(Part::Constant(imm.into())))
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.chain(iter::once(Part::Instruction(arg.into()))),
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);
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opcode
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}
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InstructionData::Ternary {
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opcode: opcode @ Opcode::Select,
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ref args,
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} => {
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operands.extend(args.iter().map(|v| Part::Instruction((*v).into())));
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opcode
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}
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InstructionData::Unary {
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opcode: opcode @ Opcode::AdjustSpDown,
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arg,
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}
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| InstructionData::Unary {
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opcode: opcode @ Opcode::Bint,
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arg,
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}
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| InstructionData::Unary {
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opcode: opcode @ Opcode::Ireduce,
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arg,
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}
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| InstructionData::Unary {
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opcode: opcode @ Opcode::Sextend,
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arg,
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}
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| InstructionData::Unary {
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opcode: opcode @ Opcode::Uextend,
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arg,
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} => {
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operands.extend(iter::once(Part::Instruction(arg.into())));
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opcode
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}
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InstructionData::UnaryBool { opcode, imm } => {
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operands.extend(iter::once(Part::Constant(Constant::Bool(
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imm,
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BitWidth::Polymorphic,
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))));
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opcode
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}
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InstructionData::UnaryImm {
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opcode: opcode @ Opcode::AdjustSpDownImm,
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imm,
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}
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| InstructionData::UnaryImm {
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opcode: opcode @ Opcode::Iconst,
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imm,
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} => {
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operands.extend(iter::once(imm.into()));
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opcode
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}
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ref otherwise => {
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log::trace!("Not supported by Peepmatic: {:?}", otherwise);
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return None;
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}
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})
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}
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fn make_inst_1(
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