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[AArch64] Always use the version of computeKnownBits that returns a value. NFCI.

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Continues the work started by @bogner in rL340594 to remove uses of the KnownBits output paramater version.

llvm-svn: 349908
This commit is contained in:
Simon Pilgrim 2018-12-21 15:05:10 +00:00
parent 148762c6ec
commit 0a3fdb6a75
3 changed files with 7 additions and 12 deletions
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9
lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
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@ -2087,8 +2087,7 @@ static bool isBitfieldPositioningOp(SelectionDAG *CurDAG, SDValue Op,
(void)BitWidth;
assert(BitWidth == 32 || BitWidth == 64);
KnownBits Known;
CurDAG->computeKnownBits(Op, Known);
KnownBits Known = CurDAG->computeKnownBits(Op);
// Non-zero in the sense that they're not provably zero, which is the key
// point if we want to use this value
@ -2167,8 +2166,7 @@ static bool tryBitfieldInsertOpFromOrAndImm(SDNode *N, SelectionDAG *CurDAG) {
// Compute the Known Zero for the AND as this allows us to catch more general
// cases than just looking for AND with imm.
KnownBits Known;
CurDAG->computeKnownBits(And, Known);
KnownBits Known = CurDAG->computeKnownBits(And);
// Non-zero in the sense that they're not provably zero, which is the key
// point if we want to use this value.
@ -2309,8 +2307,7 @@ static bool tryBitfieldInsertOpFromOr(SDNode *N, const APInt &UsefulBits,
// This allows to catch more general case than just looking for
// AND with imm. Indeed, simplify-demanded-bits may have removed
// the AND instruction because it proves it was useless.
KnownBits Known;
CurDAG->computeKnownBits(OrOpd1Val, Known);
KnownBits Known = CurDAG->computeKnownBits(OrOpd1Val);
// Check if there is enough room for the second operand to appear
// in the first one

4
lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -993,8 +993,8 @@ void AArch64TargetLowering::computeKnownBitsForTargetNode(
break;
case AArch64ISD::CSEL: {
KnownBits Known2;
DAG.computeKnownBits(Op->getOperand(0), Known, Depth + 1);
DAG.computeKnownBits(Op->getOperand(1), Known2, Depth + 1);
Known = DAG.computeKnownBits(Op->getOperand(0), Depth + 1);
Known2 = DAG.computeKnownBits(Op->getOperand(1), Depth + 1);
Known.Zero &= Known2.Zero;
Known.One &= Known2.One;
break;

6
unittests/CodeGen/AArch64SelectionDAGTest.cpp
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@ -89,8 +89,7 @@ TEST_F(AArch64SelectionDAGTest, computeKnownBits_ZERO_EXTEND_VECTOR_INREG) {
auto InVec = DAG->getConstant(0, Loc, InVecVT);
auto Op = DAG->getNode(ISD::ZERO_EXTEND_VECTOR_INREG, Loc, OutVecVT, InVec);
auto DemandedElts = APInt(2, 3);
KnownBits Known;
DAG->computeKnownBits(Op, Known, DemandedElts);
KnownBits Known = DAG->computeKnownBits(Op, DemandedElts);
EXPECT_TRUE(Known.isZero());
}
@ -105,8 +104,7 @@ TEST_F(AArch64SelectionDAGTest, computeKnownBits_EXTRACT_SUBVECTOR) {
auto ZeroIdx = DAG->getConstant(0, Loc, IdxVT);
auto Op = DAG->getNode(ISD::EXTRACT_SUBVECTOR, Loc, VecVT, Vec, ZeroIdx);
auto DemandedElts = APInt(3, 7);
KnownBits Known;
DAG->computeKnownBits(Op, Known, DemandedElts);
KnownBits Known = DAG->computeKnownBits(Op, DemandedElts);
EXPECT_TRUE(Known.isZero());
}