new testcase that caused instcombine to crash on 176.gcc last night.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26039 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2006-02-07-SextZextCrash.ll b/test/Transforms/InstCombine/2006-02-07-SextZextCrash.ll
new file mode 100644 (file)
index 0000000..f3591e6
--- /dev/null
+++ b/test/Transforms/InstCombine/2006-02-07-SextZextCrash.ll
@@ -0,0 +1,22 @@
+; RUN: llvm-as < %s | opt -instcombine -disable-output 
+
+       %struct.rtx_const = type { uint, { %union.real_extract } }
+       %struct.rtx_def = type { int, [1 x %union.rtunion_def] }
+       %union.real_extract = type { double }
+       %union.rtunion_def = type { uint }
+
+implementation   ; Functions:
+
+fastcc void %decode_rtx_const(%struct.rtx_def* %x, %struct.rtx_const* %value) {
+       %tmp.54 = getelementptr %struct.rtx_const* %value, int 0, uint 0                ; <uint*> [#uses=1]
+       %tmp.56 = getelementptr %struct.rtx_def* %x, int 0, uint 0              ; <int*> [#uses=1]
+       %tmp.57 = load int* %tmp.56             ; <int> [#uses=1]
+       %tmp.58 = shl int %tmp.57, ubyte 8              ; <int> [#uses=1]
+       %tmp.59 = shr int %tmp.58, ubyte 24             ; <int> [#uses=1]
+       %tmp.60 = cast int %tmp.59 to ushort            ; <ushort> [#uses=1]
+       %tmp.61 = cast ushort %tmp.60 to uint           ; <uint> [#uses=1]
+       %tmp.62 = shl uint %tmp.61, ubyte 16            ; <uint> [#uses=1]
+       %tmp.65 = or uint 0, %tmp.62            ; <uint> [#uses=1]
+       store uint %tmp.65, uint* %tmp.54
+       ret void
+}