1; RUN: opt < %s -passes='require<loops>,gvn' -S | FileCheck %s 2; This test is checking that (a) this doesn't crash, and (b) we don't 3; conclude the value of %tmp17 is available in bb1.bb15_crit_edge. 4; rdar://9429882 5 6target 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" 7target triple = "x86_64-apple-macosx10.7.0" 8define i1 @rb_intern(ptr %foo) nounwind ssp { 9; CHECK-LABEL: @rb_intern( 10 11bb: 12 %tmp = alloca ptr, align 8 13 store ptr null, ptr %tmp, align 8 14 store i8 undef, ptr null, align 536870912 15 br label %bb1 16 17bb1: 18 br i1 undef, label %bb3, label %bb15 19 20; CHECK: bb1: 21; CHECK: [[TMP:%.*]] = phi ptr [ %tmp14, %bb10 ], [ null, %bb ] 22 23; CHECK: bb1.bb15_crit_edge: 24; CHECK: %tmp17.pre = load i8, ptr [[TMP]], align 1 25 26bb3: 27 call void @isalnum() 28 br i1 undef, label %bb10, label %bb5 29 30bb5: 31 br i1 undef, label %bb10, label %bb6 32 33bb6: 34 %tmp7 = load ptr, ptr %tmp, align 8 35 %tmp8 = load i8, ptr %tmp7, align 1 36 %tmp9 = zext i8 %tmp8 to i64 37 br i1 undef, label %bb15, label %bb10 38 39bb10: 40 %tmp11 = load ptr, ptr %tmp, align 8 41 %tmp12 = load i8, ptr %tmp11, align 1 42 %tmp13 = zext i8 %tmp12 to i64 43 %tmp14 = getelementptr inbounds i8, ptr %foo, i64 undef 44 store ptr %tmp14, ptr %tmp, align 8 45 br label %bb1 46 47bb15: 48 %tmp16 = load ptr, ptr %tmp, align 8 49 %tmp17 = load i8, ptr %tmp16, align 1 50 %tmp18 = icmp eq i8 %tmp17, 0 51 br label %bb19 52 53; CHECK-LABEL: bb6: 54; CHECK: br i1 undef, label %bb15split, label %bb10 55 56; CHECK-LABEL: bb15split: ; preds = %bb6 57; CHECK-NEXT: br label %bb15 58 59; CHECK-LABEL: bb15: 60; CHECK: %tmp17 = phi i8 [ %tmp12.pre3, %bb15split ], [ %tmp17.pre, %bb1.bb15_crit_edge ] 61 62bb19: ; preds = %bb15 63 ret i1 %tmp18 64} 65 66declare void @isalnum() nounwind inlinehint ssp 67