From d8a78889f633c5a60f0a1c7cb60bf9b18817d9d7 Mon Sep 17 00:00:00 2001
From: David Sherwood <david.sherwood@arm.com>
Date: Wed, 27 May 2020 15:00:00 +0100
Subject: [PATCH] [CodeGen] Fix warning in visitShuffleVector

Make sure we only ask for the number of elements after we've
bailed out for scalable vectors.

Differential revision: https://reviews.llvm.org/D80632
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index d40f7f92c4cb0..1dd5cfe1b49fa 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3458,7 +3458,6 @@ void SelectionDAGBuilder::visitShuffleVector(const User &I) {
   const TargetLowering &TLI = DAG.getTargetLoweringInfo();
   EVT VT = TLI.getValueType(DAG.getDataLayout(), I.getType());
   EVT SrcVT = Src1.getValueType();
-  unsigned SrcNumElts = SrcVT.getVectorNumElements();
 
   if (all_of(Mask, [](int Elem) { return Elem == 0; }) &&
       VT.isScalableVector()) {
@@ -3475,6 +3474,7 @@ void SelectionDAGBuilder::visitShuffleVector(const User &I) {
   // for targets that support a SPLAT_VECTOR for non-scalable vector types.
   assert(!VT.isScalableVector() && "Unsupported scalable vector shuffle");
 
+  unsigned SrcNumElts = SrcVT.getVectorNumElements();
   unsigned MaskNumElts = Mask.size();
 
   if (SrcNumElts == MaskNumElts) {