[llvm-commits] [llvm] r54123 - /llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h
Dan Gohman
gohman at apple.com
Sun Jul 27 10:44:53 PDT 2008
Author: djg
Date: Sun Jul 27 12:44:52 2008
New Revision: 54123
URL: http://llvm.org/viewvc/llvm-project?rev=54123&view=rev
Log:
Improve comments for SDNode use-count methods. No functionality change.
Modified:
llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h
Modified: llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h?rev=54123&r1=54122&r2=54123&view=diff
==============================================================================
--- llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h (original)
+++ llvm/trunk/include/llvm/CodeGen/SelectionDAGNodes.h Sun Jul 27 12:44:52 2008
@@ -858,13 +858,15 @@
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 @@
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 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.
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