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Code Issues Releases Activity

gcc 2.95 and 3.4.x on x86 32bit without fomit-frame-pointer can't even find 5 registers for asm input.

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0.5% slower vorbis.

Originally committed as revision 5964 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2006-08-09 06:33:49 +00:00
parent 8331891957
commit 2494bdd90d
1 changed files with 16 additions and 10 deletions
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26
libavcodec/i386/fft_3dn2.c
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@ -154,20 +154,23 @@ void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
in1 = input;
in2 = input + n2 - 1;
for(k = 0; k < n4; k++) {
// FIXME a single block is faster, but gcc 2.95 and 3.4.x on 32bit can't compile it
asm volatile(
"movd %1, %%mm0 \n\t"
"movd %3, %%mm1 \n\t"
"punpckldq %2, %%mm0 \n\t"
"punpckldq %4, %%mm1 \n\t"
"movd %0, %%mm0 \n\t"
"movd %2, %%mm1 \n\t"
"punpckldq %1, %%mm0 \n\t"
"punpckldq %3, %%mm1 \n\t"
"movq %%mm0, %%mm2 \n\t"
"pfmul %%mm1, %%mm0 \n\t"
"pswapd %%mm1, %%mm1 \n\t"
"pfmul %%mm1, %%mm2 \n\t"
"pfpnacc %%mm2, %%mm0 \n\t"
::"m"(in2[-2*k]), "m"(in1[2*k]),
"m"(tcos[k]), "m"(tsin[k])
);
asm volatile(
"movq %%mm0, %0 \n\t"
:"=m"(z[revtab[k]])
:"m"(in2[-2*k]), "m"(in1[2*k]),
"m"(tcos[k]), "m"(tsin[k])
);
}
@ -190,11 +193,15 @@ void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
);
}
z += n8;
asm volatile("movd %0, %%mm7" ::"r"(1<<31));
for(k = 0; k < n8; k++) {
asm volatile(
"movq %4, %%mm0 \n\t"
"pswapd %5, %%mm1 \n\t"
"movq %0, %%mm0 \n\t"
"pswapd %1, %%mm1 \n\t"
::"m"(z[k]), "m"(z[-1-k])
);
asm volatile(
"movq %%mm0, %%mm2 \n\t"
"pxor %%mm7, %%mm2 \n\t"
"punpckldq %%mm1, %%mm2 \n\t"
@ -209,8 +216,7 @@ void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
"movq %%mm3, %3 \n\t" // { z[n8-1-k].im, -z[n8+k].re }
:"=m"(output[2*k]), "=m"(output[n2-2-2*k]),
"=m"(output[n2+2*k]), "=m"(output[n-2-2*k])
:"m"(z[n8+k]), "m"(z[n8-1-k])
:"memory"
::"memory"
);
}
asm volatile("emms");