From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Wed, 3 Apr 2019 11:00:55 +0000 (+0000)
Subject: [DAGCombine] Don't use getZExtValue() until we know the constant is in range.
X-Git-Tag: llvmorg-10-init~8595
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=02599de2e1e9688ed74e2d1080c4e4f73c6072af;p=platform%2Fupstream%2Fllvm.git

[DAGCombine] Don't use getZExtValue() until we know the constant is in range.

Noticed during prep for a patch for PR40758.

llvm-svn: 357571
---

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index e58e835..93d5bce 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -6843,8 +6843,8 @@ SDValue DAGCombiner::visitSHL(SDNode *N) {
   if (N1C && N0.getOpcode() == ISD::SRL && N0.hasOneUse() &&
       TLI.shouldFoldShiftPairToMask(N, Level)) {
     if (ConstantSDNode *N0C1 = isConstOrConstSplat(N0.getOperand(1))) {
-      uint64_t c1 = N0C1->getZExtValue();
-      if (c1 < OpSizeInBits) {
+      if (N0C1->getAPIntValue().ult(OpSizeInBits)) {
+        uint64_t c1 = N0C1->getZExtValue();
         uint64_t c2 = N1C->getZExtValue();
         APInt Mask = APInt::getHighBitsSet(OpSizeInBits, OpSizeInBits - c1);
         SDValue Shift;