Test case for the recently fixed FindModifiedNodeSlot bug.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30877 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/2006-10-10-FindModifiedNodeSlotBug.ll b/test/CodeGen/X86/2006-10-10-FindModifiedNodeSlotBug.ll
new file mode 100644 (file)
index 0000000..5cb233b
--- /dev/null
+++ b/test/CodeGen/X86/2006-10-10-FindModifiedNodeSlotBug.ll
@@ -0,0 +1,31 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep shrl
+; Bug in FindModifiedNodeSlot cause tmp14 load to become a zextload and shr 31
+; is then optimized away.
+
+%tree_code_type = external global [0 x uint]
+
+void %copy_if_shared_r() {
+       %tmp = load uint* null
+       %tmp56 = and uint %tmp, 255
+       %tmp8 = getelementptr [0 x uint]* %tree_code_type, int 0, uint %tmp56
+       %tmp9 = load uint* %tmp8
+       %tmp10 = add uint %tmp9, 4294967295
+       %tmp = setgt uint %tmp10, 2
+       %tmp14 = load uint* null
+       %tmp15 = shr uint %tmp14, ubyte 31
+       %tmp15 = cast uint %tmp15 to ubyte
+       %tmp16 = setne ubyte %tmp15, 0
+       br bool %tmp, label %cond_false25, label %cond_true
+
+cond_true:
+       br bool %tmp16, label %cond_true17, label %cond_false
+
+cond_true17:
+       ret void
+
+cond_false:
+       ret void
+
+cond_false25:
+       ret void
+}