test/Transforms/InstCombine/2004-09-20-BadLoadCombine2.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt %s -passes=instcombine,mem2reg,simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S -o - | FileCheck %s

; Test to make sure that instcombine does not accidentally propagate the load
; into the PHI, which would break the program.

define i32 @test(i1 %C) {
; CHECK-LABEL: define i32 @test(
; CHECK-SAME: i1 [[C:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT:    [[X2:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 1, ptr [[X]], align 4
; CHECK-NEXT:    store i32 2, ptr [[X2]], align 4
; CHECK-NEXT:    [[SPEC_SELECT:%.*]] = select i1 [[C]], ptr [[X]], ptr [[X2]]
; CHECK-NEXT:    store i32 3, ptr [[X]], align 4
; CHECK-NEXT:    [[TMP_3:%.*]] = load i32, ptr [[SPEC_SELECT]], align 4
; CHECK-NEXT:    ret i32 [[TMP_3]]
;
entry:
  %X = alloca i32         ; <ptr> [#uses=3]
  %X2 = alloca i32                ; <ptr> [#uses=2]
  store i32 1, ptr %X
  store i32 2, ptr %X2
  br i1 %C, label %cond_true.i, label %cond_continue.i

cond_true.i:            ; preds = %entry
  br label %cond_continue.i

cond_continue.i:                ; preds = %cond_true.i, %entry
  %mem_tmp.i.0 = phi ptr [ %X, %cond_true.i ], [ %X2, %entry ]           ; <ptr> [#uses=1]
  store i32 3, ptr %X
  %tmp.3 = load i32, ptr %mem_tmp.i.0         ; <i32> [#uses=1]
  ret i32 %tmp.3
}