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Re: Fetch-and-store for PowerPC... and more!

From: Kevin Ryde
Subject: Re: Fetch-and-store for PowerPC... and more!
Date: Fri, 18 Mar 2005 07:48:12 +1100
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.3 (gnu/linux)

address@hidden (Ludovic Courtès) writes:
> I don't think so since `mem', as an address, isn't changed.

Yep, I meant the contents.

> `memory' denotes the reservation bit I guess).

No, memory normally means any crazy fetch or store, so gcc won't defer
storing stuff and wont hold stuff in registers across your asm.

"*mem" is the only actual change, so expressing that only it is
fetched/stored should give better code.  Though the actual current
usages are simple enough that it probably doesn't make any difference.

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