Added a load folding bug test case.

llvm-svn: 25472

llvm/test/Regression/CodeGen/X86/2006-01-19-ISelFoldingBug.ll

@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep 'shld' | wc -l | grep 1
+;
+; Check that the isel does not fold the shld, which already folds a load
+; and has two uses, into a store.
+%A = external global uint
+
+uint %test5(uint %B, ubyte %C) {
+	%tmp.1 = load uint *%A;
+	%tmp.2 = shl uint %tmp.1, ubyte %C
+	%tmp.3 = sub ubyte 32, %C
+	%tmp.4 = shr uint %B, ubyte %tmp.3
+	%tmp.5 = or uint %tmp.4, %tmp.2
+	store uint %tmp.5, uint* %A
+	ret uint %tmp.5
+}