Added a load folding bug test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25472 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll b/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll
new file mode 100644 (file)
index 0000000..4dc9165
--- /dev/null
+++ b/test/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
+}