; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt < %s -passes=gvn -S | FileCheck %s

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-macosx10.7.0"

; rdar://12801584
; Value of %shouldExit can be changed by RunInMode.
; Make sure we do not replace load %shouldExit in while.cond.backedge
; with a phi node where the value from while.body is 0.
define i32 @test() nounwind ssp {
; CHECK-LABEL: define i32 @test(
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[SHOULDEXIT:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[TASKSIDLE:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 0, ptr [[SHOULDEXIT]], align 4
; CHECK-NEXT:    store i32 0, ptr [[TASKSIDLE]], align 4
; CHECK-NEXT:    call void @CTestInitialize(ptr [[TASKSIDLE]]) #[[ATTR1:[0-9]+]]
; CHECK-NEXT:    br i1 true, label %[[WHILE_BODY_LR_PH:.*]], label %[[ENTRY_WHILE_END_CRIT_EDGE:.*]]
; CHECK:       [[ENTRY_WHILE_END_CRIT_EDGE]]:
; CHECK-NEXT:    br label %[[WHILE_END:.*]]
; CHECK:       [[WHILE_BODY_LR_PH]]:
; CHECK-NEXT:    br label %[[WHILE_BODY:.*]]
; CHECK:       [[WHILE_BODY]]:
; CHECK-NEXT:    call void @RunInMode(i32 100) #[[ATTR1]]
; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[TASKSIDLE]], align 4
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT:    br i1 [[TOBOOL]], label %[[WHILE_COND_BACKEDGE:.*]], label %[[IF_THEN:.*]]
; CHECK:       [[IF_THEN]]:
; CHECK-NEXT:    store i32 0, ptr [[TASKSIDLE]], align 4
; CHECK-NEXT:    call void @TimerCreate(ptr [[SHOULDEXIT]]) #[[ATTR1]]
; CHECK-NEXT:    br label %[[WHILE_COND_BACKEDGE]]
; CHECK:       [[WHILE_COND_BACKEDGE]]:
; CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[SHOULDEXIT]], align 4
; CHECK-NEXT:    [[CMP:%.*]] = icmp eq i32 [[TMP1]], 0
; CHECK-NEXT:    br i1 [[CMP]], label %[[WHILE_BODY]], label %[[WHILE_COND_WHILE_END_CRIT_EDGE:.*]]
; CHECK:       [[WHILE_COND_WHILE_END_CRIT_EDGE]]:
; CHECK-NEXT:    br label %[[WHILE_END]]
; CHECK:       [[WHILE_END]]:
; CHECK-NEXT:    ret i32 0
;
entry:
  %shouldExit = alloca i32, align 4
  %tasksIdle = alloca i32, align 4
  store i32 0, ptr %shouldExit, align 4
  store i32 0, ptr %tasksIdle, align 4
  call void @CTestInitialize(ptr %tasksIdle) nounwind
  %0 = load i32, ptr %shouldExit, align 4
  %cmp1 = icmp eq i32 %0, 0
  br i1 %cmp1, label %while.body.lr.ph, label %while.end

while.body.lr.ph:
  br label %while.body

while.body:
  call void @RunInMode(i32 100) nounwind
  %1 = load i32, ptr %tasksIdle, align 4
  %tobool = icmp eq i32 %1, 0
  br i1 %tobool, label %while.cond.backedge, label %if.then

if.then:
  store i32 0, ptr %tasksIdle, align 4
  call void @TimerCreate(ptr %shouldExit) nounwind
  br label %while.cond.backedge

while.cond.backedge:
  %2 = load i32, ptr %shouldExit, align 4
  %cmp = icmp eq i32 %2, 0
  br i1 %cmp, label %while.body, label %while.cond.while.end_crit_edge

while.cond.while.end_crit_edge:
  br label %while.end

while.end:
  ret i32 0
}
declare void @CTestInitialize(ptr)
declare void @RunInMode(i32)
declare void @TimerCreate(ptr)