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Improve comments for SDNode use-count methods. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54123 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-07-27 17:44:52 +00:00
parent 4ddc41e58c
commit 7a24cdc4ed
1 changed files with 21 additions and 10 deletions
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31
include/llvm/CodeGen/SelectionDAGNodes.h
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@ -858,13 +858,15 @@ public:
bool reachesChainWithoutSideEffects(SDOperand Dest,
unsigned Depth = 2) const;
/// hasOneUse - Return true if there is exactly one operation using this
/// result value of the defining operator.
inline bool hasOneUse() const;
/// use_empty - Return true if there are no operations using this
/// result value of the defining operator.
/// use_empty - Return true if there are no nodes using value ResNo
/// of node Val.
///
inline bool use_empty() const;
/// use_empty - Return true if there is exactly one node using value
/// ResNo of node Val.
///
inline bool hasOneUse() const;
};
@ -1096,12 +1098,21 @@ public:
return ~NodeType;
}
size_t use_size() const { return std::distance(use_begin(), use_end()); }
/// use_empty - Return true if there are no uses of this value.
///
bool use_empty() const { return Uses == NULL; }
/// hasOneUse - Return true if there is exactly one use of this value.
///
bool hasOneUse() const {
return !use_empty() && next(use_begin()) == use_end();
}
/// use_size - Return the number of uses of this value. This method takes
/// time proportional to the number of uses.
///
size_t use_size() const { return std::distance(use_begin(), use_end()); }
/// getNodeId - Return the unique node id.
///
int getNodeId() const { return NodeId; }
@ -1373,12 +1384,12 @@ inline bool SDOperand::isMachineOpcode() const {
inline unsigned SDOperand::getMachineOpcode() const {
return Val->getMachineOpcode();
}
inline bool SDOperand::hasOneUse() const {
return Val->hasNUsesOfValue(1, ResNo);
}
inline bool SDOperand::use_empty() const {
return !Val->hasAnyUseOfValue(ResNo);
}
inline bool SDOperand::hasOneUse() const {
return Val->hasNUsesOfValue(1, ResNo);
}
/// UnarySDNode - This class is used for single-operand SDNodes. This is solely
/// to allow co-allocation of node operands with the node itself.