From: Josef Angermeier <sijoange@cip.informatik.uni-erlangen.de>
To: gcc-help@gcc.gnu.org
Subject: Re: gcc's x86 "RET"-machine instruction optimization
Date: Mon, 01 Aug 2005 19:01:00 -0000 [thread overview]
Message-ID: <20050801190125.GE11284@faui00i.informatik.uni-erlangen.de> (raw)
In-Reply-To: <m34qa97eye.fsf@gossamer.airs.com>
Hello
> > GCC uses a jmp-instruction instead of a call one, so 'speeds up' execution by
> > saving the execution of bios_16_xxxx's return instruction (lretw one). This of course
> > ruins my efforts. Therfore i'd like to know how this optimization is called, and if
> > there is any gcc option to disable this particular optimization.
> These are called sibling calls, and you can turn the optimization off
> using -fno-optimize-sibling-calls.
oh great!
> (I wouldn't be surprised if you run into other problems with your
> approach, but that switch should take care of that particular
> problem.)
Mmm, i'd appreciate all hints to what problems could happen when going
this approach. Doesn't matter how vague.
> Ian
Thanks Ian, again !
josef
ciao
prev parent reply other threads:[~2005-08-01 19:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-01 13:56 Josef Angermeier
2005-08-01 17:19 ` Ian Lance Taylor
2005-08-01 19:01 ` Josef Angermeier [this message]
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