new testcase for PR905

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30265 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2006-09-11-EmptyStructCrash.ll b/test/Transforms/InstCombine/2006-09-11-EmptyStructCrash.ll
new file mode 100644 (file)
index 0000000..0369307
--- /dev/null
+++ b/test/Transforms/InstCombine/2006-09-11-EmptyStructCrash.ll
@@ -0,0 +1,47 @@
+; RUN: llvm-as < %s | opt -instcombine -disable-output
+; PR905
+
+       %RPYTHON_EXCEPTION = type { %RPYTHON_EXCEPTION_VTABLE* }
+       %RPYTHON_EXCEPTION_VTABLE = type { %RPYTHON_EXCEPTION_VTABLE*, int, int, %RPyOpaque_RuntimeTypeInfo*, %arraytype_Char*, %functiontype_12* }
+       %RPyOpaque_RuntimeTypeInfo = type opaque*
+       %arraytype_Char = type { int, [0 x sbyte] }
+       %fixarray_array1019 = type [1019 x sbyte*]
+       %functiontype_12 = type %RPYTHON_EXCEPTION* ()
+       %functiontype_14 = type void (%structtype_pypy.rpython.memory.gc.MarkSweepGC*)
+       %structtype_AddressLinkedListChunk = type { %structtype_AddressLinkedListChunk*, int, %fixarray_array1019 }
+       %structtype_exceptions.Exception = type { %RPYTHON_EXCEPTION }
+       %structtype_gc_pool = type {  }
+       %structtype_gc_pool_node = type { %structtype_header*, %structtype_gc_pool_node* }
+       %structtype_header = type { int, %structtype_header* }
+       %structtype_pypy.rpython.memory.gc.MarkSweepGC = type { %structtype_exceptions.Exception, int, int, bool, %structtype_gc_pool*, int, %structtype_header*, %structtype_header*, %structtype_gc_pool_node*, double, double }
+
+implementation   ; Functions:
+
+fastcc void %pypy_MarkSweepGC.collect() {
+block0:
+       %v1221 = load %structtype_AddressLinkedListChunk** null         ; <%structtype_AddressLinkedListChunk*> [#uses=1]
+       %v1222 = setne %structtype_AddressLinkedListChunk* %v1221, null         ; <bool> [#uses=1]
+       br bool %v1222, label %block79, label %block4
+
+block4:                ; preds = %block0
+       ret void
+
+block22:               ; preds = %block79
+       ret void
+
+block67:               ; preds = %block79
+       %v1459 = load %structtype_gc_pool** null                ; <%structtype_gc_pool*> [#uses=1]
+       %v1460 = cast %structtype_gc_pool* %v1459 to sbyte*             ; <sbyte*> [#uses=1]
+       %tmp_873 = cast sbyte* %v1460 to int            ; <int> [#uses=1]
+       %tmp_874 = sub int %tmp_873, 0          ; <int> [#uses=1]
+       %v1461 = cast int %tmp_874 to sbyte*            ; <sbyte*> [#uses=1]
+       %v1462 = cast sbyte* %v1461 to %structtype_header*              ; <%structtype_header*> [#uses=1]
+       %tmp_876 = getelementptr %structtype_header* %v1462, int 0, uint 0              ; <int*> [#uses=1]
+       store int 0, int* %tmp_876
+       ret void
+
+block79:               ; preds = %block0
+       %v1291 = load %structtype_gc_pool** null                ; <%structtype_gc_pool*> [#uses=1]
+       %v1292 = setne %structtype_gc_pool* %v1291, null                ; <bool> [#uses=1]
+       br bool %v1292, label %block67, label %block22
+}