Date: Mon, 27 Aug 2001 13:18:14 +0300 From: Valentin Nechayev <netch@lucky.net> To: Steve Roome <stephen_roome@yahoo.com> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: function calls/rets in assembly Message-ID: <20010827131814.A18891@lucky.net> In-Reply-To: <20010827081112.C365@dylan.home> References: <20010824010139.E365@dylan.home> <20010827081112.C365@dylan.home>
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Mon, Aug 27, 2001 at 08:11:12, stephen_roome wrote about "Re: function calls/rets in assembly":
> One final question... (which may be a gcc question, sorry if it is..)
>
> why do we have some people proposing the use of "leave". When from the
> docs I've read, leave takes longer than a mov and return ?
To optimize for some higher than i386, use -mcpu=<version>
With -mcpu=i486 and higher, gcc writes
movl %ebp,%esp
popl %ebp
Also consider -march= option.
/netch
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