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[AArch64][GlobalISel] Do not create LIFETIME instructions in functions. #115669

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Merged
merged 1 commit into from
Nov 11, 2024
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[AArch64][GlobalISel] Do not create LIFETIME instructions in functions. #115669

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3 changes: 2 additions & 1 deletion llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2166,7 +2166,8 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end: {
// No stack colouring in O0, discard region information.
if (MF->getTarget().getOptLevel() == CodeGenOptLevel::None)
if (MF->getTarget().getOptLevel() == CodeGenOptLevel::None ||
MF->getFunction().hasOptNone())
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The DAG doesn't check this, fix both together?

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It looks like DAG goes via OptLevelChanger, which sets the OptLevel and resets it after handling the function. (And forces into using fast-isel, even if we would not usually use it).

return true;

unsigned Op = ID == Intrinsic::lifetime_start ? TargetOpcode::LIFETIME_START
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14 changes: 14 additions & 0 deletions llvm/test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
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Expand Up @@ -1477,6 +1477,20 @@ define void @test_lifetime_intrin() {
ret void
}

define void @test_lifetime_intrin_optnone() optnone noinline {
; CHECK-LABEL: name: test_lifetime_intrin_optnone
; CHECK: RET_ReallyLR
; O3-LABEL: name: test_lifetime_intrin_optnone
; O3: {{%[0-9]+}}:_(p0) = G_FRAME_INDEX %stack.0.slot
; O3-NEXT: G_STORE
; O3-NEXT: RET_ReallyLR
%slot = alloca i8, i32 4
call void @llvm.lifetime.start.p0(i64 0, ptr %slot)
store volatile i8 10, ptr %slot
call void @llvm.lifetime.end.p0(i64 0, ptr %slot)
ret void
}

define void @test_load_store_atomics(ptr %addr) {
; CHECK-LABEL: name: test_load_store_atomics
; CHECK: [[ADDR:%[0-9]+]]:_(p0) = COPY $x0
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