New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2628 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GCSE/2002-05-14-OperandSwap.ll b/test/Transforms/GCSE/2002-05-14-OperandSwap.ll
new file mode 100644 (file)
index 0000000..a75e298
--- /dev/null
+++ b/test/Transforms/GCSE/2002-05-14-OperandSwap.ll
@@ -0,0 +1,18 @@
+; This entire chain of computation should be optimized away, but
+; wasn't because the two multiplies were not detected as being identical.
+;
+; RUN: if as < %s  | opt -gcse -instcombine -dce | dis | grep sub
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+implementation   ; Functions:
+
+uint "vnum_test4"(uint* %data) {
+       %reg1101 = load uint* %data, uint 1
+       %reg1111 = load uint* %data, uint 3
+       %reg109 = mul uint %reg1101, %reg1111
+       %reg108 = mul uint %reg1111, %reg1101
+       %reg121 = sub uint %reg108, %reg109
+       ret uint %reg121
+}