[AArch64] Fix a fencepost error in lowering for llvm.aarch64.neon.uqshl.

Patch by Jiangning Liu!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211014 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/AArch64/AArch64ISelLowering.cpp b/lib/Target/AArch64/AArch64ISelLowering.cpp
index c2cf5b7..7a2c9c9 100644 (file)
--- a/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -7007,7 +7007,7 @@ static SDValue tryCombineShiftImm(unsigned IID, SDNode *N, SelectionDAG &DAG) {
   if (IsRightShift && ShiftAmount <= -1 && ShiftAmount >= -(int)ElemBits)
     return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
                        DAG.getConstant(-ShiftAmount, MVT::i32));
-  else if (!IsRightShift && ShiftAmount >= 0 && ShiftAmount <= ElemBits)
+  else if (!IsRightShift && ShiftAmount >= 0 && ShiftAmount < ElemBits)
     return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
                        DAG.getConstant(ShiftAmount, MVT::i32));
 

diff --git a/test/CodeGen/AArch64/arm64-vshift.ll b/test/CodeGen/AArch64/arm64-vshift.ll
index 82ae486..65bd50c 100644 (file)
--- a/test/CodeGen/AArch64/arm64-vshift.ll
+++ b/test/CodeGen/AArch64/arm64-vshift.ll
@@ -1313,6 +1313,15 @@ define <8 x i8> @uqshli8b(<8 x i8>* %A) nounwind {
         ret <8 x i8> %tmp3
 }
 
+define <8 x i8> @uqshli8b_1(<8 x i8>* %A) nounwind {
+;CHECK-LABEL: uqshli8b_1:
+;CHECK: movi.8b [[REG:v[0-9]+]], #0x8
+;CHECK: uqshl.8b v0, v0, [[REG]]
+        %tmp1 = load <8 x i8>* %A
+        %tmp3 = call <8 x i8> @llvm.aarch64.neon.uqshl.v8i8(<8 x i8> %tmp1, <8 x i8> <i8 8, i8 8, i8 8, i8 8, i8 8, i8 8, i8 8, i8 8>)
+        ret <8 x i8> %tmp3
+}
+
 define <4 x i16> @uqshli4h(<4 x i16>* %A) nounwind {
 ;CHECK-LABEL: uqshli4h:
 ;CHECK: uqshl.4h v0, {{v[0-9]+}}, #1