llvm/llvm/test/Transforms/LICM/PR21582.ll

; RUN: opt < %s -passes=licm -S | FileCheck %s
@b = external global i32, align 4
@fn3.i = external global i32, align 4

declare i32 @g() nounwind

define i32 @f() {
entry:
  br label %for.cond

for.cond:                                         ; preds = %for.end, %entry
; CHECK-LABEL: for.cond:
; CHECK: store i32 0, ptr @b
  store i32 0, ptr @b, align 4
  br i1 true, label %for.body.preheader, label %for.end

for.body.preheader:                               ; preds = %for.cond
  br label %for.body

for.body:                                         ; preds = %for.body, %for.body.preheader
  %g.15 = phi i32 [ undef, %for.body ], [ 0, %for.body.preheader ]
  %0 = load i32, ptr @fn3.i, align 4
  %call = call i32 @g()
  br i1 false, label %for.body, label %for.end.loopexit

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %for.cond
  %whatever = phi i32 [ %call, %for.end.loopexit ], [ undef, %for.cond ]
  br i1 false, label %for.cond, label %if.then

if.then:                                          ; preds = %for.end
; CHECK-LABEL: if.then:
; CHECK: phi i32 [ {{.*}}, %for.end ]
; CHECK-NOT: store i32 0, ptr @b
; CHECK: ret i32
  ret i32 %whatever
}