llvm/test/CodeGen/X86/shrinkwrap-hang.ll
Michael Kuperstein f8ab3ef1eb [ShrinkWrap] Fix FindIDom to only have one kind of failure.
FindIDom() can fail in two different ways - it can either return nullptr or the
block itself, depending on the circumstances. Some users of FindIDom() check
one error condition, while others check the other.

Change it to always return nullptr on failure.
This fixes PR26004.

Differential Revision: http://reviews.llvm.org/D15847



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256955 91177308-0d34-0410-b5e6-96231b3b80d8
2016-01-06 18:40:11 +00:00

33 lines
1.1 KiB
LLVM

; RUN: llc %s -o - -enable-shrink-wrap=true | FileCheck %s
target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i686-pc-linux"
@b = global i32 1, align 4
@a = common global i32 0, align 4
declare void @fn1() #0
; CHECK-LABEL: fn2:
define void @fn2() #0 {
entry:
%0 = load i32, i32* @b, align 4
%tobool = icmp eq i32 %0, 0
br i1 %tobool, label %if.end, label %lbl
lbl: ; preds = %if.end, %entry
store i32 0, i32* @b, align 4
br label %if.end
if.end: ; preds = %entry, %lbl
tail call void @fn1()
%1 = load i32, i32* @b, align 4
%tobool1 = icmp eq i32 %1, 0
br i1 %tobool1, label %if.end3, label %lbl
if.end3: ; preds = %if.end
ret void
}
attributes #0 = { norecurse nounwind "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="pentium4" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }