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add a little helper function that does PHI translation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60405 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-12-02 07:16:45 +00:00
parent 88d84b245c
commit c7f7c1dc50
2 changed files with 24 additions and 0 deletions
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11
include/llvm/Value.h
View File

@ -242,6 +242,17 @@ public:
const Value *getUnderlyingObject() const {
return const_cast<Value*>(this)->getUnderlyingObject();
}
/// DoPHITranslation - If this value is a PHI node with CurBB as a its parent,
/// return the value in the PHI node corresponding to PredBB. If not, return
/// ourself. This is useful if you want to know the value something has in a
/// predecessor block.
Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB);
const Value *DoPHITranslation(const BasicBlock *CurBB,
const BasicBlock *PredBB) const{
return const_cast<Value*>(this)->DoPHITranslation(CurBB, PredBB);
}
};
inline std::ostream &operator<<(std::ostream &OS, const Value &V) {

13
lib/VMCore/Value.cpp
View File

@ -358,6 +358,19 @@ Value *Value::getUnderlyingObject() {
return this;
}
/// DoPHITranslation - If this value is a PHI node with CurBB as a its parent,
/// return the value in the PHI node corresponding to PredBB. If not, return
/// ourself. This is useful if you want to know the value something has in a
/// predecessor block.
Value *Value::DoPHITranslation(const BasicBlock *CurBB,
const BasicBlock *PredBB) {
PHINode *PN = dyn_cast<PHINode>(this);
if (PN && PN->getParent() == CurBB)
return PN->getIncomingValueForBlock(PredBB);
return this;
}
//===----------------------------------------------------------------------===//
// User Class
//===----------------------------------------------------------------------===//