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

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Noticed during prep for a patch for PR40758.

llvm-svn: 357571
This commit is contained in:
Simon Pilgrim 2019-04-03 11:00:55 +00:00
parent 4d91ddaebc
commit 15f5596487
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -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;