fix PR4815: some cases where DeleteDeadInstruction can delete

the instruction BBI points to.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80768 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 0 deletions

diff --git a/test/Transforms/DeadStoreElimination/crash.ll b/test/Transforms/DeadStoreElimination/crash.ll
new file mode 100644
index 0000000000..b35bd1aa5c
--- /dev/null
+++ b/test/Transforms/DeadStoreElimination/crash.ll
@@ -0,0 +1,26 @@
+; RUN: llvm-as < %s | opt -dse | llvm-dis
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+target triple = "i386-apple-darwin10.0"
+
+@g80 = external global i8                         ; <i8*> [#uses=3]
+
+declare signext i8 @foo(i8 signext, i8 signext) nounwind readnone ssp
+
+declare i32 @func68(i32) nounwind readonly ssp
+
+; PR4815
+define void @test1(i32 %int32p54) noreturn nounwind ssp {
+entry:
+  br label %bb
+
+bb:                                               ; preds = %bb, %entry
+  %storemerge = phi i8 [ %2, %bb ], [ 1, %entry ] ; <i8> [#uses=1]
+  store i8 %storemerge, i8* @g80
+  %0 = tail call i32 @func68(i32 1) nounwind ssp  ; <i32> [#uses=1]
+  %1 = trunc i32 %0 to i8                         ; <i8> [#uses=1]
+  store i8 %1, i8* @g80, align 1
+  store i8 undef, i8* @g80, align 1
+  %2 = tail call signext i8 @foo(i8 signext undef, i8 signext 1) nounwind ; <i8> [#uses=1]
+  br label %bb
+}