[x86] add test to show ddup hole; NFC (PR37502)

llvm-svn: 349680

diff --git a/llvm/test/CodeGen/X86/build-vector-128.ll b/llvm/test/CodeGen/X86/build-vector-128.ll
index 6c0c2d3..9702e4b 100644 (file)
--- a/llvm/test/CodeGen/X86/build-vector-128.ll
+++ b/llvm/test/CodeGen/X86/build-vector-128.ll
@@ -507,3 +507,68 @@ define <4 x i32> @test_buildvector_v4i32_splat_zext_i8(i8 %in) {
   %splat = shufflevector <4 x i32> %insert, <4 x i32> undef, <4 x i32> zeroinitializer
   ret <4 x i32> %splat
 }
+
+; PR37502 - https://bugs.llvm.org/show_bug.cgi?id=37502
+; Don't use a series of insertps when movddup will do.
+
+define <4 x float> @PR37502(float %x, float %y) {
+; SSE2-32-LABEL: PR37502:
+; SSE2-32:       # %bb.0:
+; SSE2-32-NEXT:    movsd {{.*#+}} xmm0 = mem[0],zero
+; SSE2-32-NEXT:    movlhps {{.*#+}} xmm0 = xmm0[0,0]
+; SSE2-32-NEXT:    retl
+;
+; SSE2-64-LABEL: PR37502:
+; SSE2-64:       # %bb.0:
+; SSE2-64-NEXT:    unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
+; SSE2-64-NEXT:    movlhps {{.*#+}} xmm0 = xmm0[0,0]
+; SSE2-64-NEXT:    retq
+;
+; SSE41-32-LABEL: PR37502:
+; SSE41-32:       # %bb.0:
+; SSE41-32-NEXT:    movsd {{.*#+}} xmm0 = mem[0],zero
+; SSE41-32-NEXT:    insertps {{.*#+}} xmm0 = xmm0[0,1],mem[0],xmm0[3]
+; SSE41-32-NEXT:    insertps {{.*#+}} xmm0 = xmm0[0,1,2],mem[0]
+; SSE41-32-NEXT:    retl
+;
+; SSE41-64-LABEL: PR37502:
+; SSE41-64:       # %bb.0:
+; SSE41-64-NEXT:    movaps %xmm0, %xmm2
+; SSE41-64-NEXT:    insertps {{.*#+}} xmm2 = xmm2[0],xmm1[0],xmm2[2,3]
+; SSE41-64-NEXT:    insertps {{.*#+}} xmm2 = xmm2[0,1],xmm0[0],xmm2[3]
+; SSE41-64-NEXT:    insertps {{.*#+}} xmm2 = xmm2[0,1,2],xmm1[0]
+; SSE41-64-NEXT:    movaps %xmm2, %xmm0
+; SSE41-64-NEXT:    retq
+;
+; AVX1-32-LABEL: PR37502:
+; AVX1-32:       # %bb.0:
+; AVX1-32-NEXT:    vmovsd {{.*#+}} xmm0 = mem[0],zero
+; AVX1-32-NEXT:    vinsertps {{.*#+}} xmm0 = xmm0[0,1],mem[0],xmm0[3]
+; AVX1-32-NEXT:    vinsertps {{.*#+}} xmm0 = xmm0[0,1,2],mem[0]
+; AVX1-32-NEXT:    retl
+;
+; AVX1-64-LABEL: PR37502:
+; AVX1-64:       # %bb.0:
+; AVX1-64-NEXT:    vinsertps {{.*#+}} xmm2 = xmm0[0],xmm1[0],xmm0[2,3]
+; AVX1-64-NEXT:    vinsertps {{.*#+}} xmm0 = xmm2[0,1],xmm0[0],xmm2[3]
+; AVX1-64-NEXT:    vinsertps {{.*#+}} xmm0 = xmm0[0,1,2],xmm1[0]
+; AVX1-64-NEXT:    retq
+;
+; AVX2-32-LABEL: PR37502:
+; AVX2-32:       # %bb.0:
+; AVX2-32-NEXT:    vmovsd {{.*#+}} xmm0 = mem[0],zero
+; AVX2-32-NEXT:    vmovddup {{.*#+}} xmm0 = xmm0[0,0]
+; AVX2-32-NEXT:    retl
+;
+; AVX2-64-LABEL: PR37502:
+; AVX2-64:       # %bb.0:
+; AVX2-64-NEXT:    vunpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
+; AVX2-64-NEXT:    vmovddup {{.*#+}} xmm0 = xmm0[0,0]
+; AVX2-64-NEXT:    retq
+  %i0 = insertelement <4 x float> undef, float %x, i32 0
+  %i1 = insertelement <4 x float> %i0, float %y, i32 1
+  %i2 = insertelement <4 x float> %i1, float %x, i32 2
+  %i3 = insertelement <4 x float> %i2, float %y, i32 3
+  ret <4 x float> %i3
+}
+