[Reassociation] Add support for reassociation with unsafe algebra.
Vector instructions are (still) not supported for either integer or floating
point. Hopefully, that work will be landed shortly.
llvm-svn: 215647
diff --git a/llvm/test/Transforms/Reassociate/fast-ReassociateVector.ll b/llvm/test/Transforms/Reassociate/fast-ReassociateVector.ll
new file mode 100644
index 0000000..e4b5e93
--- /dev/null
+++ b/llvm/test/Transforms/Reassociate/fast-ReassociateVector.ll
@@ -0,0 +1,25 @@
+; RUN: opt < %s -reassociate -S | FileCheck %s
+
+; Don't handle floating point vector operations.
+define <4 x float> @test1() {
+; CHECK-LABEL: test1
+; CHECK-NEXT: %tmp1 = fsub fast <4 x float> zeroinitializer, zeroinitializer
+; CHECK-NEXT: %tmp2 = fmul fast <4 x float> zeroinitializer, %tmp1
+
+ %tmp1 = fsub fast <4 x float> zeroinitializer, zeroinitializer
+ %tmp2 = fmul fast <4 x float> zeroinitializer, %tmp1
+ ret <4 x float> %tmp2
+}
+
+; We don't currently commute integer vector operations.
+define <2 x i32> @test2(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: test2
+; CHECK-NEXT: %tmp1 = add <2 x i32> %x, %y
+; CHECK-NEXT: %tmp2 = add <2 x i32> %y, %x
+; CHECK-NEXT: %tmp3 = add <2 x i32> %tmp1, %tmp2
+
+ %tmp1 = add <2 x i32> %x, %y
+ %tmp2 = add <2 x i32> %y, %x
+ %tmp3 = add <2 x i32> %tmp1, %tmp2
+ ret <2 x i32> %tmp3
+}