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Re: question regarding asm()
- To: Richard Henderson <rth at cygnus dot com>
- Subject: Re: question regarding asm()
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Thu, 16 Oct 1997 15:02:29 -0600
- cc: Marc Lehmann <pcg at goof dot com>, egcs at cygnus dot com
- Reply-To: law at cygnus dot com
In message <19971016013930.22185@dot.cygnus.com>you write:
> On Wed, Oct 15, 1997 at 10:05:34PM -0600, Jeffrey A Law wrote:
> "The input operands are guaranteed not to use any of the clobbered
> registers, and neither will the output operands' addresses, so you
> can read and write the clobbered registers as many times as you like."
>
> That from 'info gcc "c ext" "extended asm"'.
Right. That seems pretty unambigious to me.
> > and in some cases it can't even tell you that it did something
> > wrong. This is especially important on machines with weird register
> > sets like the x86.
>
> Ouch.
Yup. I wouldn't be suprised if this ends up being similar to the problems
with passing args in registers for SMALL_REGISTER_CLASS machines.
jeff