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Address code review feedback

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- A64 can reuse any of a/b/c/d for output register
- X64 can reuse c/d for output register; only b can't be reused because
  it might be clobbered when a is loaded from memory
- Remove unused condition argument from SELECT_NUM as we assume == for now
This commit is contained in:
Arseny Kapoulkine 2025-01-13 13:15:38 -08:00
parent 07578df79a
commit 9641df9633
3 changed files with 3 additions and 3 deletions
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2
CodeGen/src/IrLoweringA64.cpp
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@ -707,7 +707,7 @@ void IrLoweringA64::lowerInst(IrInst& inst, uint32_t index, const IrBlock& next)
case IrCmd::SELECT_NUM:
{
LUAU_ASSERT(FFlag::LuauCodeGenLerp);
inst.regA64 = regs.allocReuse(KindA64::d, index, {inst.a, inst.b});
inst.regA64 = regs.allocReuse(KindA64::d, index, {inst.a, inst.b, inst.c, inst.d});
RegisterA64 temp1 = tempDouble(inst.a);
RegisterA64 temp2 = tempDouble(inst.b);

2
CodeGen/src/IrLoweringX64.cpp
View file

@ -626,7 +626,7 @@ void IrLoweringX64::lowerInst(IrInst& inst, uint32_t index, const IrBlock& next)
case IrCmd::SELECT_NUM:
{
LUAU_ASSERT(FFlag::LuauCodeGenLerp);
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a}); // can't reuse b if a is a memory operand
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.c, inst.d}); // can't reuse b if a is a memory operand
ScopedRegX64 tmp{regs, SizeX64::xmmword};

2
CodeGen/src/IrTranslateBuiltins.cpp
View file

@ -311,7 +311,7 @@ static BuiltinImplResult translateBuiltinMathLerp(
IrOp t = builtinLoadDouble(build, arg3);
IrOp l = build.inst(IrCmd::ADD_NUM, a, build.inst(IrCmd::MUL_NUM, build.inst(IrCmd::SUB_NUM, b, a), t));
IrOp r = build.inst(IrCmd::SELECT_NUM, l, b, t, build.constDouble(1.0), build.cond(IrCondition::Equal));
IrOp r = build.inst(IrCmd::SELECT_NUM, l, b, t, build.constDouble(1.0)); // select on t==1.0
build.inst(IrCmd::STORE_DOUBLE, build.vmReg(ra), r);