mirror of
https://github.com/RPCSX/llvm.git
synced 2024-12-11 21:57:55 +00:00
8d5e4e48bc
This previously caused miscompilations as a result of phi nodes receiving undef incoming values from blocks dominated by such successors. Differential Revision: http://reviews.llvm.org/D10726 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240670 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
657 B
LLVM
39 lines
657 B
LLVM
; RUN: opt -gvn -S -o - %s | FileCheck %s
|
|
|
|
; If a branch has two identical successors, we cannot declare either dead.
|
|
|
|
define void @widget(i1 %p) {
|
|
entry:
|
|
br label %bb2
|
|
|
|
bb2:
|
|
%t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ]
|
|
%t2 = add i64 %t1, 1
|
|
%t3 = icmp ult i64 0, %t2
|
|
br i1 %t3, label %bb3, label %bb4
|
|
|
|
bb3:
|
|
%t4 = call i64 @f()
|
|
br label %bb4
|
|
|
|
bb4:
|
|
; CHECK-NOT: phi {{.*}} undef
|
|
%foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ]
|
|
br i1 %p, label %bb5, label %bb6
|
|
|
|
bb5:
|
|
br i1 true, label %bb7, label %bb7
|
|
|
|
bb6:
|
|
br i1 true, label %bb7, label %bb7
|
|
|
|
bb7:
|
|
%t5 = add i64 %t1, 1
|
|
br i1 %p, label %bb2, label %bb8
|
|
|
|
bb8:
|
|
ret void
|
|
}
|
|
|
|
declare i64 @f()
|