void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output, const FFTSample *input, FFTSample *tmp) { long n8, n4, n2, n; x86_reg k; const uint16_t *revtab = s->fft.revtab; const FFTSample *tcos = s->tcos; const FFTSample *tsin = s->tsin; const FFTSample *in1, *in2; FFTComplex *z = (FFTComplex *)tmp; n = 1 << s->nbits; n2 = n >> 1; n4 = n >> 2; n8 = n >> 3; /* pre rotation */ 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 %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]]) ); } ff_fft_calc(&s->fft, z); /* post rotation + reordering */ for(k = 0; k < n4; k++) { asm volatile( "movq %0, %%mm0 \n\t" "movd %1, %%mm1 \n\t" "punpckldq %2, %%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" "movq %%mm0, %0 \n\t" :"+m"(z[k]) :"m"(tcos[k]), "m"(tsin[k]) ); } k = n-8; asm volatile("movd %0, %%mm7" ::"r"(1<<31)); asm volatile( "1: \n\t" "movq (%4,%0), %%mm0 \n\t" // z[n8+k] "neg %0 \n\t" "pswapd -8(%4,%0), %%mm1 \n\t" // z[n8-1-k] "movq %%mm0, %%mm2 \n\t" "pxor %%mm7, %%mm2 \n\t" "punpckldq %%mm1, %%mm2 \n\t" "pswapd %%mm2, %%mm3 \n\t" "punpckhdq %%mm1, %%mm0 \n\t" "pswapd %%mm0, %%mm4 \n\t" "pxor %%mm7, %%mm0 \n\t" "pxor %%mm7, %%mm4 \n\t" "movq %%mm3, -8(%3,%0) \n\t" // output[n-2-2*k] = { z[n8-1-k].im, -z[n8+k].re } "movq %%mm4, -8(%2,%0) \n\t" // output[n2-2-2*k]= { -z[n8-1-k].re, z[n8+k].im } "neg %0 \n\t" "movq %%mm0, (%1,%0) \n\t" // output[2*k] = { -z[n8+k].im, z[n8-1-k].re } "movq %%mm2, (%2,%0) \n\t" // output[n2+2*k] = { -z[n8+k].re, z[n8-1-k].im } "sub $8, %0 \n\t" "jge 1b \n\t" :"+r"(k) :"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8) :"memory" ); asm volatile("femms"); }