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