From 18b008b5771bf5085268aec2ade92c315081200f Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Thu, 20 Dec 2018 17:05:57 +0000
Subject: [PATCH] [x86] add test to show missed movddup load fold; NFC

llvm-svn: 349773
---
 llvm/test/CodeGen/X86/build-vector-128.ll | 48 +++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/llvm/test/CodeGen/X86/build-vector-128.ll b/llvm/test/CodeGen/X86/build-vector-128.ll
index 9702e4be22ac..d859be16083c 100644
--- a/llvm/test/CodeGen/X86/build-vector-128.ll
+++ b/llvm/test/CodeGen/X86/build-vector-128.ll
@@ -508,6 +508,54 @@ define <4 x i32> @test_buildvector_v4i32_splat_zext_i8(i8 %in) {
   ret <4 x i32> %splat
 }
 
+define <4 x float> @movddup_load_fold(float %x, float %y) {
+; SSE2-32-LABEL: movddup_load_fold:
+; 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: movddup_load_fold:
+; 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: movddup_load_fold:
+; SSE41-32:       # %bb.0:
+; SSE41-32-NEXT:    movsd {{.*#+}} xmm0 = mem[0],zero
+; SSE41-32-NEXT:    movddup {{.*#+}} xmm0 = xmm0[0,0]
+; SSE41-32-NEXT:    retl
+;
+; SSE41-64-LABEL: movddup_load_fold:
+; SSE41-64:       # %bb.0:
+; SSE41-64-NEXT:    insertps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[2,3]
+; SSE41-64-NEXT:    movddup {{.*#+}} xmm0 = xmm0[0,0]
+; SSE41-64-NEXT:    retq
+;
+; AVX-32-LABEL: movddup_load_fold:
+; AVX-32:       # %bb.0:
+; AVX-32-NEXT:    vmovsd {{.*#+}} xmm0 = mem[0],zero
+; AVX-32-NEXT:    vmovddup {{.*#+}} xmm0 = xmm0[0,0]
+; AVX-32-NEXT:    retl
+;
+; AVX1-64-LABEL: movddup_load_fold:
+; AVX1-64:       # %bb.0:
+; AVX1-64-NEXT:    vinsertps {{.*#+}} xmm0 = xmm0[0],xmm1[0],xmm0[2,3]
+; AVX1-64-NEXT:    vmovddup {{.*#+}} xmm0 = xmm0[0,0]
+; AVX1-64-NEXT:    retq
+;
+; AVX2-64-LABEL: movddup_load_fold:
+; 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> zeroinitializer, float %x, i32 0
+  %i1 = insertelement <4 x float> %i0, float %y, i32 1
+  %dup = shufflevector <4 x float> %i1, <4 x float> undef, <4 x i32> <i32 0, i32 1, i32 0, i32 1>
+  ret <4 x float> %dup
+}
+
 ; PR37502 - https://bugs.llvm.org/show_bug.cgi?id=37502
 ; Don't use a series of insertps when movddup will do.