Fix a bug where RecursivelyDeleteTriviallyDeadInstructions could

delete the instruction pointed to by CGP's current instruction
iterator, leading to a crash on the testcase.  This fixes PR9578.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129200 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 28 insertions, 0 deletions

diff --git a/test/CodeGen/Generic/crash.ll b/test/CodeGen/Generic/crash.ll
index 042739884d..e7cc7e3394 100644
--- a/test/CodeGen/Generic/crash.ll
+++ b/test/CodeGen/Generic/crash.ll
@@ -38,3 +38,31 @@ unreachable
 declare void @Parse_Vector(double*)
 declare i32 @llvm.objectsize.i32(i8*, i1)
 
+
+; PR9578
+%struct.S0 = type { i32, i8, i32 }
+
+define void @func_82() nounwind optsize {
+entry:
+  br label %for.body.i
+
+for.body.i:                                       ; preds = %for.body.i, %entry
+  br i1 undef, label %func_74.exit.for.cond29.thread_crit_edge, label %for.body.i
+
+func_74.exit.for.cond29.thread_crit_edge:         ; preds = %for.body.i
+  %f13576.pre = getelementptr inbounds %struct.S0* undef, i64 0, i32 1
+  store i8 0, i8* %f13576.pre, align 4, !tbaa !0
+  br label %lbl_468
+
+lbl_468:                                          ; preds = %lbl_468, %func_74.exit.for.cond29.thread_crit_edge
+  %f13577.ph = phi i8* [ %f13576.pre, %func_74.exit.for.cond29.thread_crit_edge ], [ %f135.pre, %lbl_468 ]
+  store i8 1, i8* %f13577.ph, align 1
+  %f135.pre = getelementptr inbounds %struct.S0* undef, i64 0, i32 1
+  br i1 undef, label %lbl_468, label %for.end74
+
+for.end74:                                        ; preds = %lbl_468
+  ret void
+}
+
+!0 = metadata !{metadata !"omnipotent char", metadata !1}
+!1 = metadata !{metadata !"Simple C/C++ TBAA", null}