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Add ISD::isBuildVectorAllZeros predicate
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27147 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -459,6 +459,9 @@ namespace ISD {
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/// BUILD_VECTOR where all of the elements are ~0 or undef.
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bool isBuildVectorAllOnesInteger(const SDNode *N);
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/// isBuildVectorAllZeros - Return true if the specified node is a
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/// BUILD_VECTOR where all of the elements are 0 or undef.
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bool isBuildVectorAllZeros(const SDNode *N);
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//===--------------------------------------------------------------------===//
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/// ISD::CondCode enum - These are ordered carefully to make the bitfields
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@ -101,6 +101,30 @@ bool ISD::isBuildVectorAllOnesInteger(const SDNode *N) {
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}
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/// isBuildVectorAllZeros - Return true if the specified node is a
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/// BUILD_VECTOR where all of the elements are 0 or undef.
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bool ISD::isBuildVectorAllZeros(const SDNode *N) {
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if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
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bool AllUndef = true;
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for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
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SDOperand Elt = N->getOperand(i);
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if (Elt.getOpcode() != ISD::UNDEF) {
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AllUndef = false;
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if (isa<ConstantSDNode>(Elt)) {
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if (!cast<ConstantSDNode>(Elt)->isNullValue())
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return false;
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} else if (isa<ConstantFPSDNode>(Elt)) {
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if (!cast<ConstantFPSDNode>(Elt)->isExactlyValue(0.0))
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return false;
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} else
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return false;
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}
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}
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return !AllUndef;
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}
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/// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
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/// when given the operation for (X op Y).
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ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
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