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Add interfaces to update value numbering results

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13677 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-05-23 21:11:17 +00:00
parent c43e0ae350
commit bc78225518
1 changed files with 22 additions and 5 deletions
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27
include/llvm/Analysis/ValueNumbering.h
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@ -39,13 +39,30 @@ struct ValueNumbering {
///===-------------------------------------------------------------------===//
/// Interfaces to update value numbering analysis information as the client
/// changes the program
/// changes the program.
///
/// deleteInstruction - Clients should invoke this method when they delete an
/// instruction from the program. This allows the analysis implementations to
/// avoid having dangling pointers in their representation.
virtual void deleteInstruction(Instruction *I) {}
/// deleteValue - This method should be called whenever an LLVM Value is
/// deleted from the program, for example when an instruction is found to be
/// redundant and is eliminated.
///
virtual void deleteValue(Value *V) {}
/// copyValue - This method should be used whenever a preexisting value in the
/// program is copied or cloned, introducing a new value. Note that analysis
/// implementations should tolerate clients that use this method to introduce
/// the same value multiple times: if the analysis already knows about a
/// value, it should ignore the request.
///
virtual void copyValue(Value *From, Value *To) {}
/// replaceWithNewValue - This method is the obvious combination of the two
/// above, and it provided as a helper to simplify client code.
///
void replaceWithNewValue(Value *Old, Value *New) {
copyValue(Old, New);
deleteValue(Old);
}
};
extern void BasicValueNumberingStub();