65 lines
2.4 KiB
LLVM
65 lines
2.4 KiB
LLVM
; RUN: opt -S -hotcoldsplit -hotcoldsplit-threshold=0 < %s 2>&1 | FileCheck %s
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
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declare void @use(i8*)
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declare void @cold_use2(i8*, i8*) cold
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; CHECK-LABEL: define {{.*}}@foo(
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define void @foo() {
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entry:
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%local1 = alloca i256
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%local2 = alloca i256
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%local1_cast = bitcast i256* %local1 to i8*
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%local2_cast = bitcast i256* %local2 to i8*
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br i1 undef, label %normalPath, label %outlinedPath
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normalPath:
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; These two uses of stack slots are non-overlapping. Based on this alone,
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; the stack slots could be merged.
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local1_cast)
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call void @use(i8* %local1_cast)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local1_cast)
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local2_cast)
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call void @use(i8* %local2_cast)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local2_cast)
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ret void
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; CHECK-LABEL: codeRepl:
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; CHECK: [[local1_cast:%.*]] = bitcast i256* %local1 to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local1_cast]])
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; CHECK-NEXT: [[local2_cast:%.*]] = bitcast i256* %local2 to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 -1, i8* [[local2_cast]])
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; CHECK-NEXT: call i1 @foo.cold.1(i8* %local1_cast, i8* %local2_cast)
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; CHECK-NEXT: br i1
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outlinedPath:
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; These two uses of stack slots are overlapping. This should prevent
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; merging of stack slots. CodeExtractor must replicate the effects of
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; these markers in the caller to inhibit stack coloring.
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%gep1 = getelementptr inbounds i8, i8* %local1_cast, i64 1
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %gep1)
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local2_cast)
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call void @cold_use2(i8* %local1_cast, i8* %local2_cast)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %gep1)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local2_cast)
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br i1 undef, label %outlinedPath2, label %outlinedPathExit
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outlinedPath2:
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; These extra lifetime markers are used to test that we emit only one
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; pair of guard markers in the caller per memory object.
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call void @llvm.lifetime.start.p0i8(i64 1, i8* %local2_cast)
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call void @use(i8* %local2_cast)
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call void @llvm.lifetime.end.p0i8(i64 1, i8* %local2_cast)
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ret void
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outlinedPathExit:
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ret void
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}
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; CHECK-LABEL: define {{.*}}@foo.cold.1(
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; CHECK-NOT: @llvm.lifetime
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