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[ValueTracking] Simplify KnownBits construction 

Use the simpler BitWidth constructor instead of the copy constructor to
make it clear when we don't actually need to copy an existing KnownBits
value. Split out from D74539. NFC.
This commit is contained in:
Jay Foad 2020-04-09 08:52:45 +01:00
parent 8f66f25f52
commit 94cc9eccf6
1 changed files with 3 additions and 3 deletions
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6
llvm/lib/Analysis/ValueTracking.cpp
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@ -1121,7 +1121,7 @@ static void computeKnownBitsFromOperator(const Operator *I,
const Query &Q) {
unsigned BitWidth = Known.getBitWidth();
KnownBits Known2(Known);
KnownBits Known2(BitWidth);
switch (I->getOpcode()) {
default: break;
case Instruction::Load:
@ -1534,7 +1534,7 @@ static void computeKnownBitsFromOperator(const Operator *I,
computeKnownBits(R, Known2, Depth + 1, RecQ);
// We need to take the minimum number of known bits
KnownBits Known3(Known);
KnownBits Known3(BitWidth);
RecQ.CxtI = LInst;
computeKnownBits(L, Known3, Depth + 1, RecQ);
@ -1688,7 +1688,7 @@ static void computeKnownBitsFromOperator(const Operator *I,
if (II->getIntrinsicID() == Intrinsic::fshr)
ShiftAmt = BitWidth - ShiftAmt;
KnownBits Known3(Known);
KnownBits Known3(BitWidth);
computeKnownBits(I->getOperand(0), Known2, Depth + 1, Q);
computeKnownBits(I->getOperand(1), Known3, Depth + 1, Q);