forked from OSchip/llvm-project
53 lines
1.6 KiB
LLVM
53 lines
1.6 KiB
LLVM
; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
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target triple = "i686-unknown-linux-gnu"
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; Check that instcombine doesn't sink dynamic allocas across llvm.stacksave.
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; Helper to generate branch conditions.
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declare i1 @cond()
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declare i32* @use_and_return(i32*)
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declare i8* @llvm.stacksave() #0
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declare void @llvm.stackrestore(i8*) #0
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define void @foo(i32 %x) {
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entry:
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%c1 = call i1 @cond()
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br i1 %c1, label %ret, label %nonentry
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nonentry: ; preds = %entry
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%argmem = alloca i32, i32 %x, align 4
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%sp = call i8* @llvm.stacksave()
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%c2 = call i1 @cond()
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br i1 %c2, label %ret, label %sinktarget
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sinktarget: ; preds = %nonentry
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; Arrange for there to be a single use of %argmem by returning it.
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%p = call i32* @use_and_return(i32* nonnull %argmem)
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store i32 13, i32* %p, align 4
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call void @llvm.stackrestore(i8* %sp)
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%0 = call i32* @use_and_return(i32* %p)
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br label %ret
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ret: ; preds = %sinktarget, %nonentry, %entry
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ret void
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}
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; CHECK-LABEL: define void @foo(i32 %x)
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; CHECK: nonentry:
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; CHECK: %argmem = alloca i32, i32 %x
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; CHECK: %sp = call i8* @llvm.stacksave()
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; CHECK: %c2 = call i1 @cond()
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; CHECK: br i1 %c2, label %ret, label %sinktarget
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; CHECK: sinktarget:
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; CHECK: %p = call i32* @use_and_return(i32* nonnull %argmem)
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; CHECK: store i32 13, i32* %p
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; CHECK: call void @llvm.stackrestore(i8* %sp)
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; CHECK: %0 = call i32* @use_and_return(i32* %p)
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attributes #0 = { nounwind }
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