vpblend intrinsics combines as shifts intrinsics due to absence return stmt between them

Fix PR20088

Differential Revision: http://reviews.llvm.org/D4277

llvm-svn: 211617

2 files changed, 11 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index e3fd0ceae31..874257f2124 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -19188,6 +19188,8 @@ static SDValue PerformINTRINSIC_WO_CHAINCombine(SDNode *N, SelectionDAG &DAG,
       if (C->isAllOnesValue())
         return Op1;
     }
+
+    return SDValue();
   }
 
   // Packed SSE2/AVX2 arithmetic shift immediate intrinsics.
diff --git a/llvm/test/CodeGen/X86/pr20088.ll b/llvm/test/CodeGen/X86/pr20088.ll
new file mode 100644
index 00000000000..d7aab7fcba4
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr20088.ll
@@ -0,0 +1,9 @@
+; RUN: llc < %s -mattr=+avx | FileCheck %s
+
+declare <16 x i8> @llvm.x86.sse41.pblendvb(<16 x i8>, <16 x i8>, <16 x i8>)
+
+define <16 x i8> @foo(<16 x i8> %x) {
+; CHECK: vpblendvb
+  %res = call <16 x i8> @llvm.x86.sse41.pblendvb(<16 x i8> zeroinitializer, <16 x i8> <i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1, i8 1>, <16 x i8> %x)
+  ret <16 x i8> %res;
+}