1 files changed, 16 insertions, 0 deletions
diff --git a/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll b/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll
new file mode 100644
index 0000000..02180cb
--- /dev/null
+++ b/test/CodeGen/X86/2006-01-19-ISelFoldingBug.ll
@@ -0,0 +1,16 @@
+; RUN: llvm-upgrade < %s | llvm-as | llc -march=x86 | \
+; RUN:   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
+}