gvn should never crash on this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60987 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GVN/2008-12-12-RLE-Crash.ll b/test/Transforms/GVN/2008-12-12-RLE-Crash.ll
new file mode 100644 (file)
index 0000000..99fadc7
--- /dev/null
+++ b/test/Transforms/GVN/2008-12-12-RLE-Crash.ll
@@ -0,0 +1,35 @@
+; RUN: llvm-as < %s | opt -gvn | 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-darwin7"
+
+define i32 @main(i32 %argc, i8** %argv) nounwind {
+entry:
+       br label %bb84
+
+bb41:          ; preds = %bb82
+       %tmp = load i8* %opt.0, align 1         ; <i8> [#uses=0]
+       %tmp1 = getelementptr i8* %opt.0, i32 1         ; <i8*> [#uses=2]
+       switch i32 0, label %bb81 [
+               i32 102, label %bb82
+               i32 110, label %bb79
+               i32 118, label %bb80
+       ]
+
+bb79:          ; preds = %bb41
+       br label %bb82
+
+bb80:          ; preds = %bb41
+       ret i32 0
+
+bb81:          ; preds = %bb41
+       ret i32 1
+
+bb82:          ; preds = %bb84, %bb79, %bb41
+       %opt.0 = phi i8* [ %tmp3, %bb84 ], [ %tmp1, %bb79 ], [ %tmp1, %bb41 ]           ; <i8*> [#uses=3]
+       %tmp2 = load i8* %opt.0, align 1                ; <i8> [#uses=0]
+       br i1 false, label %bb84, label %bb41
+
+bb84:          ; preds = %bb82, %entry
+       %tmp3 = getelementptr i8* null, i32 1           ; <i8*> [#uses=1]
+       br label %bb82
+}