[FFmpeg-devel] [PATCH] fix h264_deblock_sse2.asm segfaults on clang/x86-32

Måns Rullgård mans
Thu Sep 2 11:09:20 CEST 2010

Michael Niedermayer <michaelni at gmx.at> writes:

> On Wed, Sep 01, 2010 at 06:06:11PM +0200, Reimar D?ffinger wrote:
>> On Wed, Sep 01, 2010 at 07:43:29AM -0400, Ronald S. Bultje wrote:
>> > We can optimize the code for compilers that do realign the way we want
>> > if people prefer that.
>> If there's no measurable slowdown that would just make things worse
>> in the maintainability sense I think.
>> But since the majority does not seem to consider "ignore clang for now"
>> an option I withdraw any objections (well, I mostly meant to ask rather
>> than object anyway).
> supporting plain C with clang is all fine but to support clang with
> asm optimizations clang first must support the feature set we require
> for that and maintaining alignment is one of these.
> I dont mind if people disable optimized code for clang or add such
> workarounds conditional on the compiler being clang.
> But iam against such workarounds being added as if it was a bugfix
> because once clang will be fixed all these hacks would then be forgoten
> without ifdef clang/buggy_whatever. And there are enough hacks in the
> code that noone knows why they where added

Not aligning the stack is not a bug.

M?ns Rullg?rd
mans at mansr.com

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