From bc782255181229e4b63d33489ea1165156f10d68 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 23 May 2004 21:11:17 +0000 Subject: Add interfaces to update value numbering results git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13677 91177308-0d34-0410-b5e6-96231b3b80d8 --- include/llvm/Analysis/ValueNumbering.h | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) (limited to 'include/llvm/Analysis/ValueNumbering.h') diff --git a/include/llvm/Analysis/ValueNumbering.h b/include/llvm/Analysis/ValueNumbering.h index 965e87fe97..8190b3fc7a 100644 --- a/include/llvm/Analysis/ValueNumbering.h +++ b/include/llvm/Analysis/ValueNumbering.h @@ -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(); -- cgit v1.2.3