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From: Johan Rydberg<jrydberg@g...>
Date: Fri May 14 14:46:38 CEST 2004
Subject: [openrisc] 1 bit condition code register

On Sat, 15 May 2004, Damjan Lampret wrote:

: Actually, I was doing a lot of analysis in 1999 looking at the Alpha model
: and comparing it to the traditional model of flags. If you remember at the
: time I defined only one true flag and that is "F" flag; the one set by sfXX
: instructions. Everything else like CY came later and these are not real
: flags... The alpha model doesn't have much advantage.

I do not have any problems at all with having a single -flag- register.
But I wouldn't miss a "set register if flag is set" instruction, or
simply a copy-flag-to-gpr instruction. This would not break the
current ISA, but could be seen as an extension. Maybe something to
think about for the next revision?

Hope you're feeling better, Damjan.

~j