From a4876282704d2eb88405778f402f34973162f835 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Thu, 20 Jun 2019 10:56:37 +0000
Subject: [DAGCombine] Reduce scope of ShAmtVal variable. NFCI.

Fixes cppcheck warning.

Use the more capable getAPIntVal() instead of getZExtValue() as well since I'm here.

llvm-svn: 363921
---
 llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 33e339de354..5eee749d330 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -9840,14 +9840,13 @@ SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
       N0.getOperand(0).getOpcode() == ISD::ZERO_EXTEND &&
       N0.hasOneUse()) {
     SDValue ShAmt = N0.getOperand(1);
-    unsigned ShAmtVal = cast<ConstantSDNode>(ShAmt)->getZExtValue();
     if (N0.getOpcode() == ISD::SHL) {
       SDValue InnerZExt = N0.getOperand(0);
       // If the original shl may be shifting out bits, do not perform this
       // transformation.
       unsigned KnownZeroBits = InnerZExt.getValueSizeInBits() -
         InnerZExt.getOperand(0).getValueSizeInBits();
-      if (ShAmtVal > KnownZeroBits)
+      if (cast<ConstantSDNode>(ShAmt)->getAPIntValue().ugt(KnownZeroBits))
         return SDValue();
     }
 
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