[llvm] r337356 - [X86] Add test case for missed opportunity to commute vunpckhpd to enable use of vmovlps to fold a load.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Wed Jul 18 00:31:30 2018
New Revision: 337356

URL: http://llvm.org/viewvc/llvm-project?rev=337356&view=rev
Log:
[X86] Add test case for missed opportunity to commute vunpckhpd to enable use of vmovlps to fold a load.

We do this transform for SSE, but not AVX or AVX512VL.

Modified:
    llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll

Modified: llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll?rev=337356&r1=337355&r2=337356&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll (original)
+++ llvm/trunk/test/CodeGen/X86/vector-shuffle-128-v2.ll Wed Jul 18 00:31:30 2018
@@ -1301,3 +1301,19 @@ define <2 x double> @shuffle_mem_v2f64_1
   %shuffle = shufflevector <2 x double> %a, <2 x double> undef, <2 x i32> <i32 1, i32 0>
   ret <2 x double> %shuffle
 }
+
+define <2 x double> @shuffle_mem_v2f64_31(<2 x double> %a, <2 x double>* %b) {
+; SSE-LABEL: shuffle_mem_v2f64_31:
+; SSE:       # %bb.0:
+; SSE-NEXT:    movlps {{.*#+}} xmm0 = mem[0,1],xmm0[2,3]
+; SSE-NEXT:    retq
+;
+; AVX-LABEL: shuffle_mem_v2f64_31:
+; AVX:       # %bb.0:
+; AVX-NEXT:    vmovaps (%rdi), %xmm1
+; AVX-NEXT:    vunpckhpd {{.*#+}} xmm0 = xmm1[1],xmm0[1]
+; AVX-NEXT:    retq
+  %c = load <2 x double>, <2 x double>* %b
+  %f = shufflevector <2 x double> %a, <2 x double> %c, <2 x i32> <i32 3, i32 1>
+  ret <2 x double> %f
+}