; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
; This test is checking that (a) this doesn't crash, and (b) we don't
; conclude the value of %tmp17 is available in bb1.bb15_crit_edge.
; rdar://9429882

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"

define i1 @rb_intern() nounwind ssp {
; CHECK-LABEL: @rb_intern(

bb:
  %tmp = alloca i8*, align 8
  store i8* null, i8** %tmp, align 8
  store i8 undef, i8* null, align 536870912
  br label %bb1

bb1:
  br i1 undef, label %bb3, label %bb15

; CHECK: bb1:
; CHECK: [[TMP:%.*]] = phi i8* [ getelementptr (i8, i8* null, i64 undef), %bb10 ], [ null, %bb ]

; CHECK: bb1.bb15_crit_edge:
; CHECK: %tmp17.pre = load i8, i8* [[TMP]], align 1

bb3:
  call void @isalnum()
  br i1 undef, label %bb10, label %bb5

bb5:
  br i1 undef, label %bb10, label %bb6

bb6:
  %tmp7 = load i8*, i8** %tmp, align 8
  %tmp8 = load i8, i8* %tmp7, align 1
  %tmp9 = zext i8 %tmp8 to i64
  br i1 undef, label %bb15, label %bb10

bb10:
  %tmp11 = load i8*, i8** %tmp, align 8
  %tmp12 = load i8, i8* %tmp11, align 1
  %tmp13 = zext i8 %tmp12 to i64
  %tmp14 = getelementptr inbounds i8, i8* null, i64 undef
  store i8* %tmp14, i8** %tmp, align 8
  br label %bb1

bb15:
  %tmp16 = load i8*, i8** %tmp, align 8
  %tmp17 = load i8, i8* %tmp16, align 1
  %tmp18 = icmp eq i8 %tmp17, 0
  br label %bb19

; CHECK: bb15:
; CHECK: %tmp17 = phi i8 [ %tmp17.pre, %bb1.bb15_crit_edge ], [ %tmp8, %bb6 ]

bb19:                                             ; preds = %bb15
  ret i1 %tmp18
}

declare void @isalnum() nounwind inlinehint ssp