mirror of https://git.ffmpeg.org/ffmpeg.git
tweak ff_imdct_calc_3dn2
Originally committed as revision 6312 to svn://svn.ffmpeg.org/ffmpeg/trunk
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ebbafcb454
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@ -177,15 +177,13 @@ void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
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);
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}
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z += n8;
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k = n-8;
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asm volatile("movd %0, %%mm7" ::"r"(1<<31));
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for(k = 0; k < n8; k++) {
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asm volatile(
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"movq %0, %%mm0 \n\t"
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"pswapd %1, %%mm1 \n\t"
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::"m"(z[k]), "m"(z[-1-k])
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);
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asm volatile(
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asm volatile(
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"1: \n\t"
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"movq (%4,%0), %%mm0 \n\t" // z[n8+k]
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"neg %0 \n\t"
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"pswapd -8(%4,%0), %%mm1 \n\t" // z[n8-1-k]
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"movq %%mm0, %%mm2 \n\t"
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"pxor %%mm7, %%mm2 \n\t"
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"punpckldq %%mm1, %%mm2 \n\t"
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@ -194,15 +192,17 @@ void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
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"pswapd %%mm0, %%mm4 \n\t"
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"pxor %%mm7, %%mm0 \n\t"
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"pxor %%mm7, %%mm4 \n\t"
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"movq %%mm0, %0 \n\t" // { -z[n8+k].im, z[n8-1-k].re }
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"movq %%mm4, %1 \n\t" // { -z[n8-1-k].re, z[n8+k].im }
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"movq %%mm2, %2 \n\t" // { -z[n8+k].re, z[n8-1-k].im }
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"movq %%mm3, %3 \n\t" // { z[n8-1-k].im, -z[n8+k].re }
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:"=m"(output[2*k]), "=m"(output[n2-2-2*k]),
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"=m"(output[n2+2*k]), "=m"(output[n-2-2*k])
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::"memory"
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);
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}
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"movq %%mm3, -8(%3,%0) \n\t" // output[n-2-2*k] = { z[n8-1-k].im, -z[n8+k].re }
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"movq %%mm4, -8(%2,%0) \n\t" // output[n2-2-2*k]= { -z[n8-1-k].re, z[n8+k].im }
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"neg %0 \n\t"
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"movq %%mm0, (%1,%0) \n\t" // output[2*k] = { -z[n8+k].im, z[n8-1-k].re }
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"movq %%mm2, (%2,%0) \n\t" // output[n2+2*k] = { -z[n8+k].re, z[n8-1-k].im }
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"sub $8, %0 \n\t"
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"jge 1b \n\t"
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:"+r"(k)
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:"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8)
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:"memory"
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);
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asm volatile("femms");
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}
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