void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output, const FFTSample *input, FFTSample *tmp) { long k, n8, n4, n2, n; 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; asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1)); /* pre rotation */ in1 = input; in2 = input + n2 - 4; /* Complex multiplication Two complex products per iteration, we could have 4 with 8 xmm registers, 8 with 16 xmm registers. Maybe we should unroll more. */ for (k = 0; k < n4; k += 2) { asm volatile ( "movaps %0, %%xmm0 \n\t" // xmm0 = r0 X r1 X : in2 "movaps %1, %%xmm3 \n\t" // xmm3 = X i1 X i0: in1 "movlps %2, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos "movlps %3, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin "shufps $95, %%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0 "shufps $160,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0 "unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0 "movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 "xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0 "mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR "shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0 "mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii "addps %%xmm3, %%xmm0 \n\t" // xmm0 = result ::"m"(in2[-2*k]), "m"(in1[2*k]), "m"(tcos[k]), "m"(tsin[k]) ); /* Should be in the same block, hack for gcc2.95 & gcc3 */ asm ( "movlps %%xmm0, %0 \n\t" "movhps %%xmm0, %1 \n\t" :"=m"(z[revtab[k]]), "=m"(z[revtab[k + 1]]) ); } ff_fft_calc_sse(&s->fft, z); /* Not currently needed, added for safety */ asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1)); /* post rotation + reordering */ for (k = 0; k < n4; k += 2) { asm ( "movaps %0, %%xmm0 \n\t" // xmm0 = i1 r1 i0 r0: z "movlps %1, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos "movaps %%xmm0, %%xmm3 \n\t" // xmm3 = i1 r1 i0 r0 "movlps %2, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin "shufps $160,%%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0 "shufps $245,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0 "unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0 "movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0 "xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0 "mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR "shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0 "mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii "addps %%xmm3, %%xmm0 \n\t" // xmm0 = result "movaps %%xmm0, %0 \n\t" :"+m"(z[k]) :"m"(tcos[k]), "m"(tsin[k]) ); } /* Mnemonics: 0 = z[k].re 1 = z[k].im 2 = z[k + 1].re 3 = z[k + 1].im 4 = z[-k - 2].re 5 = z[-k - 2].im 6 = z[-k - 1].re 7 = z[-k - 1].im */ k = 16-n; asm volatile("movaps %0, %%xmm7 \n\t"::"m"(*m1m1m1m1)); asm volatile( "1: \n\t" "movaps -16(%4,%0), %%xmm1 \n\t" // xmm1 = 4 5 6 7 = z[-2-k] "neg %0 \n\t" "movaps (%4,%0), %%xmm0 \n\t" // xmm0 = 0 1 2 3 = z[k] "xorps %%xmm7, %%xmm0 \n\t" // xmm0 = -0 -1 -2 -3 "movaps %%xmm0, %%xmm2 \n\t" // xmm2 = -0 -1 -2 -3 "shufps $141,%%xmm1, %%xmm0 \n\t" // xmm0 = -1 -3 4 6 "shufps $216,%%xmm1, %%xmm2 \n\t" // xmm2 = -0 -2 5 7 "shufps $156,%%xmm0, %%xmm0 \n\t" // xmm0 = -1 6 -3 4 ! "shufps $156,%%xmm2, %%xmm2 \n\t" // xmm2 = -0 7 -2 5 ! "movaps %%xmm0, (%1,%0) \n\t" // output[2*k] "movaps %%xmm2, (%2,%0) \n\t" // output[n2+2*k] "neg %0 \n\t" "shufps $27, %%xmm0, %%xmm0 \n\t" // xmm0 = 4 -3 6 -1 "xorps %%xmm7, %%xmm0 \n\t" // xmm0 = -4 3 -6 1 ! "shufps $27, %%xmm2, %%xmm2 \n\t" // xmm2 = 5 -2 7 -0 ! "movaps %%xmm0, -16(%2,%0) \n\t" // output[n2-4-2*k] "movaps %%xmm2, -16(%3,%0) \n\t" // output[n-4-2*k] "add $16, %0 \n\t" "jle 1b \n\t" :"+r"(k) :"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8) :"memory" ); }