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Faster SSE FFT/MDCT, patch by Zuxy Meng %zuxy P meng A gmail P com%
unrolls some loops, utilizing all 8 xmm registers. fft-test shows ~10% speed up in (I)FFT and ~8% speed up in (I)MDCT on Dothan Originally committed as revision 9017 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Zuxy Meng
Guillaume Poirier
parent
3a136a06fd
commit
25e4f8aaee
@ -100,20 +100,33 @@ void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
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i = nloops*8;
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asm volatile(
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"1: \n\t"
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"sub $16, %0 \n\t"
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"sub $32, %0 \n\t"
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"movaps (%2,%0), %%xmm1 \n\t"
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"movaps (%1,%0), %%xmm0 \n\t"
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"movaps 16(%2,%0), %%xmm5 \n\t"
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"movaps 16(%1,%0), %%xmm4 \n\t"
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"movaps %%xmm1, %%xmm2 \n\t"
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"movaps %%xmm5, %%xmm6 \n\t"
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"shufps $0xA0, %%xmm1, %%xmm1 \n\t"
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"shufps $0xF5, %%xmm2, %%xmm2 \n\t"
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"shufps $0xA0, %%xmm5, %%xmm5 \n\t"
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"shufps $0xF5, %%xmm6, %%xmm6 \n\t"
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"mulps (%3,%0,2), %%xmm1 \n\t" // cre*re cim*re
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"mulps 16(%3,%0,2), %%xmm2 \n\t" // -cim*im cre*im
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"mulps 32(%3,%0,2), %%xmm5 \n\t" // cre*re cim*re
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"mulps 48(%3,%0,2), %%xmm6 \n\t" // -cim*im cre*im
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"addps %%xmm2, %%xmm1 \n\t"
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"addps %%xmm6, %%xmm5 \n\t"
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"movaps %%xmm0, %%xmm3 \n\t"
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"movaps %%xmm4, %%xmm7 \n\t"
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"addps %%xmm1, %%xmm0 \n\t"
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"subps %%xmm1, %%xmm3 \n\t"
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"addps %%xmm5, %%xmm4 \n\t"
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"subps %%xmm5, %%xmm7 \n\t"
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"movaps %%xmm0, (%1,%0) \n\t"
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"movaps %%xmm3, (%2,%0) \n\t"
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"movaps %%xmm4, 16(%1,%0) \n\t"
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"movaps %%xmm7, 16(%2,%0) \n\t"
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"jg 1b \n\t"
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:"+r"(i)
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:"r"(p), "r"(p + nloops), "r"(cptr)
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@ -141,67 +154,106 @@ void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output,
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n4 = n >> 2;
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n8 = n >> 3;
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asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1));
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#ifdef ARCH_X86_64
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asm volatile ("movaps %0, %%xmm8\n\t"::"m"(*p1m1p1m1));
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#define P1M1P1M1 "%%xmm8"
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#else
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#define P1M1P1M1 "%4"
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#endif
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/* pre rotation */
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in1 = input;
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in2 = input + n2 - 4;
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/* Complex multiplication
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Two complex products per iteration, we could have 4 with 8 xmm
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registers, 8 with 16 xmm registers.
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Maybe we should unroll more.
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*/
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for (k = 0; k < n4; k += 2) {
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/* Complex multiplication */
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for (k = 0; k < n4; k += 4) {
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asm volatile (
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"movaps %0, %%xmm0 \n\t" // xmm0 = r0 X r1 X : in2
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"movaps %1, %%xmm3 \n\t" // xmm3 = X i1 X i0: in1
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"movaps -16+%0, %%xmm4 \n\t" // xmm4 = r0 X r1 X : in2
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"movaps 16+%1, %%xmm7 \n\t" // xmm7 = X i1 X i0: in1
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"movlps %2, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos
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"movlps %3, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin
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"movlps 8+%2, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos
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"movlps 8+%3, %%xmm6 \n\t" // xmm6 = X X I1 I0: tsin
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"shufps $95, %%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0
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"shufps $160,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0
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"shufps $95, %%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0
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"shufps $160,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0
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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0
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"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0
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"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0
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"xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
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"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0
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"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
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"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = -I1 R1 -I0 R0
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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
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"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
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"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 -I1 R0 -I0
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
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"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri -Ii Ri -Ii
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result
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"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result
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::"m"(in2[-2*k]), "m"(in1[2*k]),
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"m"(tcos[k]), "m"(tsin[k])
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#ifndef ARCH_X86_64
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,"m"(*p1m1p1m1)
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#endif
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);
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/* Should be in the same block, hack for gcc2.95 & gcc3 */
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asm (
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"movlps %%xmm0, %0 \n\t"
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"movhps %%xmm0, %1 \n\t"
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:"=m"(z[revtab[k]]), "=m"(z[revtab[k + 1]])
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"movlps %%xmm4, %2 \n\t"
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"movhps %%xmm4, %3 \n\t"
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:"=m"(z[revtab[k]]), "=m"(z[revtab[k + 1]]),
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"=m"(z[revtab[k + 2]]), "=m"(z[revtab[k + 3]])
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);
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}
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ff_fft_calc_sse(&s->fft, z);
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/* Not currently needed, added for safety */
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asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1));
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#ifndef ARCH_X86_64
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#undef P1M1P1M1
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#define P1M1P1M1 "%3"
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#endif
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/* post rotation + reordering */
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for (k = 0; k < n4; k += 2) {
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for (k = 0; k < n4; k += 4) {
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asm (
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"movaps %0, %%xmm0 \n\t" // xmm0 = i1 r1 i0 r0: z
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"movaps 16+%0, %%xmm4 \n\t" // xmm4 = i1 r1 i0 r0: z
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"movlps %1, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos
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"movlps 8+%1, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos
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"movaps %%xmm0, %%xmm3 \n\t" // xmm3 = i1 r1 i0 r0
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"movaps %%xmm4, %%xmm7 \n\t" // xmm7 = i1 r1 i0 r0
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"movlps %2, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin
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"movlps 8+%2, %%xmm6 \n\t" // xmm6 = X X I1 I0: tsin
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"shufps $160,%%xmm0, %%xmm0 \n\t" // xmm0 = r1 r1 r0 r0
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"shufps $245,%%xmm3, %%xmm3 \n\t" // xmm3 = i1 i1 i0 i0
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"shufps $160,%%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0
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"shufps $245,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0
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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0
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"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0
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"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0
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"xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
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"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0
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"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
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"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = -I1 R1 -I0 R0
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"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
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"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 -I1 R0 -I0
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
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"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri -Ii Ri -Ii
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result
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"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result
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"movaps %%xmm0, %0 \n\t"
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"movaps %%xmm4, 16+%0 \n\t"
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:"+m"(z[k])
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:"m"(tcos[k]), "m"(tsin[k])
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#ifndef ARCH_X86_64
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,"m"(*p1m1p1m1)
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#endif
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);
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}
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