[FFmpeg-devel] [PATCH] Fix compilation of FASTDIV() with llvm-gcc on x86_64

Måns Rullgård mans
Mon Jul 5 17:01:26 CEST 2010


Michael Niedermayer <michaelni at gmx.at> writes:

> On Mon, Jul 05, 2010 at 02:54:09PM +0100, Mans Rullgard wrote:
>> LLVM requires matching input and output asm parameters to have the
>> same type.  For the FASTDIV macro, an (int) cast on the input fixes
>> this trivially.
>
> the extra cast likely slows it down

GCC generates the same code.

> if asm as "specified" by gcc can handle it anything that cannot
> is not compatible and they likely want to fix it to be compatible.

I think the llvm error is perfectly reasonable.  How can an operand
have two types at the same time?

-- 
M?ns Rullg?rd
mans at mansr.com



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