61 lines
2.0 KiB
LLVM
61 lines
2.0 KiB
LLVM
; RUN: opt -S -hotcoldsplit -hotcoldsplit-threshold=0 < %s 2>&1 | FileCheck %s
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declare void @llvm.lifetime.start.p0(i64, ptr nocapture)
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declare void @llvm.lifetime.end.p0(i64, ptr nocapture)
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declare void @use(ptr)
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declare void @cold_use2(ptr, ptr) 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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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.p0(i64 1, ptr %local1)
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call void @use(ptr %local1)
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call void @llvm.lifetime.end.p0(i64 1, ptr %local1)
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call void @llvm.lifetime.start.p0(i64 1, ptr %local2)
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call void @use(ptr %local2)
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call void @llvm.lifetime.end.p0(i64 1, ptr %local2)
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ret void
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; CHECK-LABEL: codeRepl:
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 -1, ptr %local1)
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(i64 -1, ptr %local2)
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; CHECK-NEXT: call i1 @foo.cold.1(ptr %local1, ptr %local2)
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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, ptr %local1, i64 1
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call void @llvm.lifetime.start.p0(i64 1, ptr %gep1)
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call void @llvm.lifetime.start.p0(i64 1, ptr %local2)
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call void @cold_use2(ptr %local1, ptr %local2)
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call void @llvm.lifetime.end.p0(i64 1, ptr %gep1)
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call void @llvm.lifetime.end.p0(i64 1, ptr %local2)
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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.p0(i64 1, ptr %local2)
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call void @use(ptr %local2)
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call void @llvm.lifetime.end.p0(i64 1, ptr %local2)
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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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