[FFmpeg-devel] [PATCH]Remove test for cpuid instruction from cpuid.c

Måns Rullgård mans
Sun Nov 23 15:13:21 CET 2008

Carl Eugen Hoyos <cehoyos at ag.or.at> writes:

> Hi!
> M?ns Rullg?rd <mans <at> mansr.com> writes:
>> >> cpuid is an ia32 instruction that was added for later 80486 processors. I 
>> >> propose to remove the check for its existence from i386/cpuid.c.
>> >> ffmpeg can still be compiled for 80386 with --disable-mmx.
>> >>
>> >> (Fixes compilation with icc 11.0)
>> >>
>> >> Please comment, Carl Eugen
>> >
>> > Iam against this (which is effectitly droping support for 386 & 486 CPU
>> > for normal binary ffmpeg packages)
> True, but is there really an ia32 system without cpuid that runs a
> distribution where such a package can be installed?
>> The only 486 still in existence I'm aware of is the one on-board the
>> Hubble space telescope.  Do you suppose they run FFmpeg there?
> Please note that most 80486 processors would still be supported;-)
> You did already comment on issue 709: The application crashes after
> return - I don't know if it's really the stack (debugging is,
> however, impossible), but I reported the problem to intel and they
> "escalated" the problem. IMO, that just means it will be tested next
> time when a new version of the compiler will be released.

Can you create a minimal stand-alone test case?  That should be much
easier to debug.

M?ns Rullg?rd
mans at mansr.com

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