[FFmpeg-devel] [Ffmpeg-devel] [PATCH] detect support for 10 operands in configure
Mon Feb 9 21:37:30 CET 2009
Loren Merritt <lorenm at u.washington.edu> writes:
> On Mon, 9 Feb 2009, Diego Biurrun wrote:
>> I think this is the proper solution for the gcc 2.95 breakage that just
>> occurred. Probably there is a better way to write the check, but it
>> seems to work and I know no Assembler.
> Your patch implicitly checks have_7regs too.
> --Loren Merritt
> Index: configure
> --- configure (revision 17097)
> +++ configure (working copy)
> @@ -898,6 +900,7 @@
> + ten_operands
> @@ -1778,6 +1782,19 @@
> # check wether EBX is available on x86
> check_asm ebx_available '"":::"%ebx"'
> + # check whether more than 10 operands are supported
> + check_cc -O1 <<EOF && enable ten_operands
> +int main(void)
> + int x=0;
> + __asm__ volatile(
> + "nop\n"
You could even make that an empty string. GCC doesn't care.
> + :"+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x)
Does & make a difference with +?
mans at mansr.com
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