[X86] Add knownbits vector logical shift test

In preparation for demandedelts support

llvm-svn: 286447

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/known-bits-vector.ll b/llvm/test/CodeGen/X86/known-bits-vector.ll
index 0c21eb1cf3f..5f751edd4de 100644
--- a/llvm/test/CodeGen/X86/known-bits-vector.ll
+++ b/llvm/test/CodeGen/X86/known-bits-vector.ll
@@ -135,3 +135,26 @@ define <4 x float> @knownbits_mask_xor_shuffle_uitofp(<4 x i32> %a0) nounwind {
   %4 = uitofp <4 x i32> %3 to <4 x float>
   ret <4 x float> %4
 }
+
+define <4 x i32> @knownbits_mask_shl_shuffle_lshr(<4 x i32> %a0) nounwind {
+; X32-LABEL: knownbits_mask_shl_shuffle_lshr:
+; X32:       # BB#0:
+; X32-NEXT:    vpand {{\.LCPI.*}}, %xmm0, %xmm0
+; X32-NEXT:    vpslld $17, %xmm0, %xmm0
+; X32-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[0,0,3,3]
+; X32-NEXT:    vpsrld $15, %xmm0, %xmm0
+; X32-NEXT:    retl
+;
+; X64-LABEL: knownbits_mask_shl_shuffle_lshr:
+; X64:       # BB#0:
+; X64-NEXT:    vpand {{.*}}(%rip), %xmm0, %xmm0
+; X64-NEXT:    vpslld $17, %xmm0, %xmm0
+; X64-NEXT:    vpshufd {{.*#+}} xmm0 = xmm0[0,0,3,3]
+; X64-NEXT:    vpsrld $15, %xmm0, %xmm0
+; X64-NEXT:    retq
+  %1 = and <4 x i32> %a0, <i32 -65536, i32 -7, i32 -7, i32 -65536>
+  %2 = shl <4 x i32> %1, <i32 17, i32 17, i32 17, i32 17>
+  %3 = shufflevector <4 x i32> %2, <4 x i32> undef, <4 x i32> <i32 0, i32 0, i32 3, i32 3>
+  %4 = lshr <4 x i32> %3, <i32 15, i32 15, i32 15, i32 15>
+  ret <4 x i32> %4
+}