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Update the comments for ComputeMaskedBits, which lost its Mask parameter

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in r154011.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208757 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jay Foad 2014-05-14 08:00:07 +00:00
parent b8236e532a
commit 5fa4d1cd1a
4 changed files with 9 additions and 12 deletions
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7
include/llvm/Analysis/ValueTracking.h
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@ -27,14 +27,13 @@ namespace llvm {
class MDNode;
class TargetLibraryInfo;
/// ComputeMaskedBits - Determine which of the bits specified in Mask are
/// ComputeMaskedBits - Determine which bits of V are
/// known to be either zero or one and return them in the KnownZero/KnownOne
/// bit sets. This code only analyzes bits in Mask, in order to short-circuit
/// processing.
/// bit sets.
///
/// This function is defined on values with integer type, values with pointer
/// type (but only if TD is non-null), and vectors of integers. In the case
/// where V is a vector, the mask, known zero, and known one values are the
/// where V is a vector, the known zero and known one values are the
/// same width as the vector element, and the bit is set only if it is true
/// for all of the elements in the vector.
void ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,

5
include/llvm/CodeGen/SelectionDAG.h
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@ -1079,10 +1079,9 @@ public:
bool MaskedValueIsZero(SDValue Op, const APInt &Mask, unsigned Depth = 0)
const;
/// ComputeMaskedBits - Determine which of the bits specified in Mask are
/// ComputeMaskedBits - Determine which bits of Op are
/// known to be either zero or one and return them in the KnownZero/KnownOne
/// bitsets. This code only analyzes bits in Mask, in order to short-circuit
/// processing. Targets can implement the computeMaskedBitsForTargetNode
/// bitsets. Targets can implement the computeMaskedBitsForTargetNode
/// method in the TargetLowering class to allow target nodes to be understood.
void ComputeMaskedBits(SDValue Op, APInt &KnownZero, APInt &KnownOne,
unsigned Depth = 0) const;

4
lib/Analysis/ValueTracking.cpp
View File

@ -211,7 +211,7 @@ void llvm::computeMaskedBitsLoad(const MDNode &Ranges, APInt &KnownZero) {
KnownZero = APInt::getHighBitsSet(BitWidth, MinLeadingZeros);
}
/// ComputeMaskedBits - Determine which of the bits are known to be either zero
/// ComputeMaskedBits - Determine which bits of V are known to be either zero
/// or one and return them in the KnownZero/KnownOne bit sets.
///
/// NOTE: we cannot consider 'undef' to be "IsZero" here. The problem is that
@ -241,7 +241,7 @@ void llvm::ComputeMaskedBits(Value *V, APInt &KnownZero, APInt &KnownOne,
V->getType()->getScalarSizeInBits() == BitWidth) &&
KnownZero.getBitWidth() == BitWidth &&
KnownOne.getBitWidth() == BitWidth &&
"V, Mask, KnownOne and KnownZero should have same BitWidth");
"V, KnownOne and KnownZero should have same BitWidth");
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
// We know all of the bits for a constant!

5
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -1812,10 +1812,9 @@ bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask,
return (KnownZero & Mask) == Mask;
}
/// ComputeMaskedBits - Determine which of the bits specified in Mask are
/// ComputeMaskedBits - Determine which bits of Op are
/// known to be either zero or one and return them in the KnownZero/KnownOne
/// bitsets. This code only analyzes bits in Mask, in order to short-circuit
/// processing.
/// bitsets.
void SelectionDAG::ComputeMaskedBits(SDValue Op, APInt &KnownZero,
APInt &KnownOne, unsigned Depth) const {
const TargetLowering *TLI = TM.getTargetLowering();