1 files changed, 48 insertions, 7 deletions
diff --git a/test/CodeGen/X86/buildvec-insertvec.ll b/test/CodeGen/X86/buildvec-insertvec.ll
index 3fb69a48b3c7..73dbe1f650a1 100644
--- a/test/CodeGen/X86/buildvec-insertvec.ll
+++ b/test/CodeGen/X86/buildvec-insertvec.ll
@@ -1,15 +1,56 @@
-; RUN: llc < %s -mcpu=corei7 -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse4.1 | FileCheck %s
 
 define void @foo(<3 x float> %in, <4 x i8>* nocapture %out) nounwind {
+; CHECK-LABEL: foo:
+; CHECK:       # BB#0:
+; CHECK-NEXT:    cvttps2dq %xmm0, %xmm0
+; CHECK-NEXT:    movl $255, %eax
+; CHECK-NEXT:    pinsrd $3, %eax, %xmm0
+; CHECK-NEXT:    pshufb {{.*#+}} xmm0 = xmm0[0,4,8,12,u,u,u,u,u,u,u,u,u,u,u,u]
+; CHECK-NEXT:    movd %xmm0, (%rdi)
+; CHECK-NEXT:    retq
   %t0 = fptoui <3 x float> %in to <3 x i8>
   %t1 = shufflevector <3 x i8> %t0, <3 x i8> undef, <4 x i32> <i32 0, i32 1, i32 2, i32 undef>
   %t2 = insertelement <4 x i8> %t1, i8 -1, i32 3
   store <4 x i8> %t2, <4 x i8>* %out, align 4
   ret void
-; CHECK: foo
-; CHECK: cvttps2dq
-; CHECK-NOT: pextrd
-; CHECK: pinsrd
-; CHECK-NEXT: pshufb
-; CHECK: ret
+}
+
+; Verify that the DAGCombiner doesn't wrongly fold a build_vector into a
+; blend with a zero vector if the build_vector contains negative zero.
+;
+; TODO: the codegen for function 'test_negative_zero_1' is sub-optimal.
+; Ideally, we should generate a single shuffle blend operation.
+
+define <4 x float> @test_negative_zero_1(<4 x float> %A) {
+; CHECK-LABEL: test_negative_zero_1:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    movapd %xmm0, %xmm1
+; CHECK-NEXT:    shufpd {{.*#+}} xmm1 = xmm1[1,0]
+; CHECK-NEXT:    xorps %xmm2, %xmm2
+; CHECK-NEXT:    blendps {{.*#+}} xmm2 = xmm1[0],xmm2[1,2,3]
+; CHECK-NEXT:    movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
+; CHECK-NEXT:    unpcklps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[1],xmm1[1]
+; CHECK-NEXT:    unpcklpd {{.*#+}} xmm0 = xmm0[0],xmm2[0]
+; CHECK-NEXT:    retq
+entry:
+  %0 = extractelement <4 x float> %A, i32 0
+  %1 = insertelement <4 x float> undef, float %0, i32 0
+  %2 = insertelement <4 x float> %1, float -0.0, i32 1
+  %3 = extractelement <4 x float> %A, i32 2
+  %4 = insertelement <4 x float> %2, float %3, i32 2
+  %5 = insertelement <4 x float> %4, float 0.0, i32 3
+  ret <4 x float> %5
+}
+
+define <2 x double> @test_negative_zero_2(<2 x double> %A) {
+; CHECK-LABEL: test_negative_zero_2:
+; CHECK:       # BB#0: # %entry
+; CHECK-NEXT:    movhpd {{.*}}(%rip), %xmm0
+; CHECK-NEXT:    retq
+entry:
+  %0 = extractelement <2 x double> %A, i32 0
+  %1 = insertelement <2 x double> undef, double %0, i32 0
+  %2 = insertelement <2 x double> %1, double -0.0, i32 1
+  ret <2 x double> %2
 }