new testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21787 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/test/Transforms/Reassociate/mul-neg-add.ll b/test/Transforms/Reassociate/mul-neg-add.ll
new file mode 100644
index 0000000000..79eeb198ac
--- /dev/null
+++ b/test/Transforms/Reassociate/mul-neg-add.ll
@@ -0,0 +1,8 @@
+; RUN: llvm-as < %s | opt -reassociate -instcombine | llvm-dis | not grep 'sub int 0'
+
+int %test(int %X, int %Y, int %Z) {
+	%A = sub int 0, %X
+	%B = mul int %A, %Y
+	%C = add int %B, %Z   ; (-X)*Y + Z -> Z-X*Y
+	ret int %C
+}