Re: SSA-form and cmove

Tim Harris <>
27 Aug 2000 21:50:47 -0400

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From: Tim Harris <>
Newsgroups: comp.compilers
Date: 27 Aug 2000 21:50:47 -0400
Organization: University of Cambridge Computer Laboratory
References: 00-08-066
Keywords: analysis

If you want to encode instructions in an SSA form then some other
problems might exist for swap/exchange instructions that update
both of their operands and maybe, in principle at least, for
CAS (compare and swap).

Breaking these into multiple SSA-like instructions may itself be
problematic if the original instructions are intended to operate
atomically:-). I expect, in practise, that this is not really
a problem in most cases where one of the operands to CAS must be
an address in the heap.



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