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Add helpers for checking if a value is a target boolean constant.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205335 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-04-01 18:13:22 +00:00
parent 6b10f3a87d
commit 1ff5f1a061
2 changed files with 56 additions and 0 deletions
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8
include/llvm/Target/TargetLowering.h
View File

@ -1934,6 +1934,14 @@ public:
void CommitTargetLoweringOpt(const TargetLoweringOpt &TLO);
};
/// Return if the N is a constant or constant vector equal to the true value
/// from getBooleanContents().
bool isConstTrueVal(const SDNode *N) const;
/// Return if the N is a constant or constant vector equal to the false value
/// from getBooleanContents().
bool isConstFalseVal(const SDNode *N) const;
/// Try to simplify a setcc built with the specified operands and cc. If it is
/// unable to simplify it, return a null SDValue.
SDValue SimplifySetCC(EVT VT, SDValue N0, SDValue N1,

48
lib/CodeGen/SelectionDAG/TargetLowering.cpp
View File

@ -1117,6 +1117,54 @@ static bool ValueHasExactlyOneBitSet(SDValue Val, const SelectionDAG &DAG) {
(KnownOne.countPopulation() == 1);
}
bool TargetLowering::isConstTrueVal(const SDNode *N) const {
if (!N)
return false;
bool IsVec = false;
const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
if (!CN) {
const BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(N);
if (!BV)
return false;
IsVec = true;
CN = BV->getConstantSplatValue();
}
switch (getBooleanContents(IsVec)) {
case UndefinedBooleanContent:
return CN->getAPIntValue()[0];
case ZeroOrOneBooleanContent:
return CN->isOne();
case ZeroOrNegativeOneBooleanContent:
return CN->isAllOnesValue();
}
llvm_unreachable("Invalid boolean contents");
}
bool TargetLowering::isConstFalseVal(const SDNode *N) const {
if (!N)
return false;
bool IsVec = false;
const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
if (!CN) {
const BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(N);
if (!BV)
return false;
IsVec = true;
CN = BV->getConstantSplatValue();
}
if (getBooleanContents(IsVec) == UndefinedBooleanContent)
return !CN->getAPIntValue()[0];
return CN->isNullValue();
}
/// SimplifySetCC - Try to simplify a setcc built with the specified operands
/// and cc. If it is unable to simplify it, return a null SDValue.
SDValue