From ded23a7fb172c198b20f9b9338e80d17cf0a51c8 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Sat, 13 May 2017 17:41:07 +0000
Subject: [PATCH] [X86][SSE] Test showing inability of ComputeNumSignBits to
 resolve shuffles

llvm-svn: 302992
---
 .../test/CodeGen/X86/known-signbits-vector.ll | 72 +++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/llvm/test/CodeGen/X86/known-signbits-vector.ll b/llvm/test/CodeGen/X86/known-signbits-vector.ll
index cea9ac26edbc..b69589c2dde8 100644
--- a/llvm/test/CodeGen/X86/known-signbits-vector.ll
+++ b/llvm/test/CodeGen/X86/known-signbits-vector.ll
@@ -137,3 +137,75 @@ define float @signbits_ashr_insert_ashr_extract_sitofp(i64 %a0, i64 %a1) nounwin
   %6 = sitofp i64 %5 to float
   ret float %6
 }
+
+define <4 x double> @signbits_sext_shuffle_sitofp(<4 x i32> %a0, <4 x i64> %a1) nounwind {
+; X32-LABEL: signbits_sext_shuffle_sitofp:
+; X32:       # BB#0:
+; X32-NEXT:    pushl %ebp
+; X32-NEXT:    movl %esp, %ebp
+; X32-NEXT:    andl $-8, %esp
+; X32-NEXT:    subl $64, %esp
+; X32-NEXT:    vpmovsxdq %xmm0, %xmm1
+; X32-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
+; X32-NEXT:    vpmovsxdq %xmm0, %xmm0
+; X32-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
+; X32-NEXT:    vpermilpd {{.*#+}} ymm0 = ymm0[1,0,3,2]
+; X32-NEXT:    vperm2f128 {{.*#+}} ymm0 = ymm0[2,3,0,1]
+; X32-NEXT:    vpextrd $1, %xmm0, %eax
+; X32-NEXT:    vpinsrd $1, %eax, %xmm0, %xmm1
+; X32-NEXT:    vmovq %xmm1, {{[0-9]+}}(%esp)
+; X32-NEXT:    vpextrd $3, %xmm0, %eax
+; X32-NEXT:    vpshufd {{.*#+}} xmm1 = xmm0[2,3,0,1]
+; X32-NEXT:    vpinsrd $1, %eax, %xmm1, %xmm1
+; X32-NEXT:    vmovq %xmm1, {{[0-9]+}}(%esp)
+; X32-NEXT:    vextractf128 $1, %ymm0, %xmm0
+; X32-NEXT:    vpextrd $1, %xmm0, %eax
+; X32-NEXT:    vpinsrd $1, %eax, %xmm0, %xmm1
+; X32-NEXT:    vmovq %xmm1, {{[0-9]+}}(%esp)
+; X32-NEXT:    vpextrd $3, %xmm0, %eax
+; X32-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
+; X32-NEXT:    vpinsrd $1, %eax, %xmm0, %xmm0
+; X32-NEXT:    vmovq %xmm0, {{[0-9]+}}(%esp)
+; X32-NEXT:    fildll {{[0-9]+}}(%esp)
+; X32-NEXT:    fstpl {{[0-9]+}}(%esp)
+; X32-NEXT:    fildll {{[0-9]+}}(%esp)
+; X32-NEXT:    fstpl {{[0-9]+}}(%esp)
+; X32-NEXT:    vmovsd {{.*#+}} xmm0 = mem[0],zero
+; X32-NEXT:    vmovhpd {{.*#+}} xmm0 = xmm0[0],mem[0]
+; X32-NEXT:    fildll {{[0-9]+}}(%esp)
+; X32-NEXT:    fstpl {{[0-9]+}}(%esp)
+; X32-NEXT:    fildll {{[0-9]+}}(%esp)
+; X32-NEXT:    fstpl (%esp)
+; X32-NEXT:    vmovsd {{.*#+}} xmm1 = mem[0],zero
+; X32-NEXT:    vmovhpd {{.*#+}} xmm1 = xmm1[0],mem[0]
+; X32-NEXT:    vinsertf128 $1, %xmm1, %ymm0, %ymm0
+; X32-NEXT:    movl %ebp, %esp
+; X32-NEXT:    popl %ebp
+; X32-NEXT:    retl
+;
+; X64-LABEL: signbits_sext_shuffle_sitofp:
+; X64:       # BB#0:
+; X64-NEXT:    vpmovsxdq %xmm0, %xmm1
+; X64-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[2,3,0,1]
+; X64-NEXT:    vpmovsxdq %xmm0, %xmm0
+; X64-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
+; X64-NEXT:    vpermilpd {{.*#+}} ymm0 = ymm0[1,0,3,2]
+; X64-NEXT:    vperm2f128 {{.*#+}} ymm0 = ymm0[2,3,0,1]
+; X64-NEXT:    vextractf128 $1, %ymm0, %xmm1
+; X64-NEXT:    vpextrq $1, %xmm1, %rax
+; X64-NEXT:    vcvtsi2sdq %rax, %xmm2, %xmm2
+; X64-NEXT:    vmovq %xmm1, %rax
+; X64-NEXT:    vcvtsi2sdq %rax, %xmm3, %xmm1
+; X64-NEXT:    vunpcklpd {{.*#+}} xmm1 = xmm1[0],xmm2[0]
+; X64-NEXT:    vpextrq $1, %xmm0, %rax
+; X64-NEXT:    vcvtsi2sdq %rax, %xmm3, %xmm2
+; X64-NEXT:    vmovq %xmm0, %rax
+; X64-NEXT:    vcvtsi2sdq %rax, %xmm3, %xmm0
+; X64-NEXT:    vunpcklpd {{.*#+}} xmm0 = xmm0[0],xmm2[0]
+; X64-NEXT:    vinsertf128 $1, %xmm1, %ymm0, %ymm0
+; X64-NEXT:    retq
+  %1 = sext <4 x i32> %a0 to <4 x i64>
+  %2 = shufflevector <4 x i64> %1, <4 x i64>%a1, <4 x i32> <i32 3, i32 2, i32 1, i32 0>
+  %3 = sitofp <4 x i64> %2 to <4 x double>
+  ret <4 x double> %3
+}