[X86] Add test case that shows failure to use a vector ANDN when both inputs to the AND are XORs.

The matching code tries to canonicalize XOR to the left, but if there are two XORs and only one is a vnot, this canonicalization can prevent matching.

llvm-svn: 293402

1 files changed, 25 insertions, 2 deletions

diff --git a/llvm/test/CodeGen/X86/vec_logical.ll b/llvm/test/CodeGen/X86/vec_logical.ll
index b632616cde8..fb9db449ac9 100644
--- a/llvm/test/CodeGen/X86/vec_logical.ll
+++ b/llvm/test/CodeGen/X86/vec_logical.ll
@@ -5,13 +5,13 @@
 define void @t(<4 x float> %A) {
 ; SSE-LABEL: t:
 ; SSE:       # BB#0:
-; SSE-NEXT:    xorps .LCPI0_0, %xmm0
+; SSE-NEXT:    xorps {{\.LCPI.*}}, %xmm0
 ; SSE-NEXT:    movaps %xmm0, 0
 ; SSE-NEXT:    retl
 ;
 ; AVX-LABEL: t:
 ; AVX:       # BB#0:
-; AVX-NEXT:    vxorps .LCPI0_0, %xmm0, %xmm0
+; AVX-NEXT:    vxorps {{\.LCPI.*}}, %xmm0, %xmm0
 ; AVX-NEXT:    vmovaps %xmm0, 0
 ; AVX-NEXT:    retl
   %tmp1277 = fsub <4 x float> < float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00 >, %A
@@ -85,3 +85,26 @@ entry:
   store <4 x float> %tmp30, <4 x float>* %d
   ret void
 }
+
+define <2 x i64> @andn_double_xor(<2 x i64> %a, <2 x i64> %b, <2 x i64> %c) {
+; SSE-LABEL: andn_double_xor:
+; SSE:       # BB#0:
+; SSE-NEXT:    pcmpeqd %xmm3, %xmm3
+; SSE-NEXT:    pxor %xmm3, %xmm0
+; SSE-NEXT:    pxor %xmm2, %xmm1
+; SSE-NEXT:    pand %xmm1, %xmm0
+; SSE-NEXT:    retl
+;
+; AVX-LABEL: andn_double_xor:
+; AVX:       # BB#0:
+; AVX-NEXT:    vpcmpeqd %xmm3, %xmm3, %xmm3
+; AVX-NEXT:    vpxor %xmm3, %xmm0, %xmm0
+; AVX-NEXT:    vpxor %xmm2, %xmm1, %xmm1
+; AVX-NEXT:    vpand %xmm1, %xmm0, %xmm0
+; AVX-NEXT:    retl
+  %1 = xor <2 x i64> %a, <i64 -1, i64 -1>
+  %2 = xor <2 x i64> %b, %c
+  %3 = and <2 x i64> %1, %2
+  ret <2 x i64> %3
+}
+