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Faster SSE FFT/MDCT, patch by Zuxy Meng %zuxy P meng A gmail P com%

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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 2007-05-13 16:32:32 +00:00 committed by Guillaume Poirier
parent 3a136a06fd
commit 25e4f8aaee
1 changed files with 66 additions and 14 deletions
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80
libavcodec/i386/fft_sse.c
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@ -100,20 +100,33 @@ void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
i = nloops*8;
asm volatile(
"1: \n\t"
"sub $16, %0 \n\t"
"sub $32, %0 \n\t"
"movaps (%2,%0), %%xmm1 \n\t"
"movaps (%1,%0), %%xmm0 \n\t"
"movaps 16(%2,%0), %%xmm5 \n\t"
"movaps 16(%1,%0), %%xmm4 \n\t"
"movaps %%xmm1, %%xmm2 \n\t"
"movaps %%xmm5, %%xmm6 \n\t"
"shufps $0xA0, %%xmm1, %%xmm1 \n\t"
"shufps $0xF5, %%xmm2, %%xmm2 \n\t"
"shufps $0xA0, %%xmm5, %%xmm5 \n\t"
"shufps $0xF5, %%xmm6, %%xmm6 \n\t"
"mulps (%3,%0,2), %%xmm1 \n\t" // cre*re cim*re
"mulps 16(%3,%0,2), %%xmm2 \n\t" // -cim*im cre*im
"mulps 32(%3,%0,2), %%xmm5 \n\t" // cre*re cim*re
"mulps 48(%3,%0,2), %%xmm6 \n\t" // -cim*im cre*im
"addps %%xmm2, %%xmm1 \n\t"
"addps %%xmm6, %%xmm5 \n\t"
"movaps %%xmm0, %%xmm3 \n\t"
"movaps %%xmm4, %%xmm7 \n\t"
"addps %%xmm1, %%xmm0 \n\t"
"subps %%xmm1, %%xmm3 \n\t"
"addps %%xmm5, %%xmm4 \n\t"
"subps %%xmm5, %%xmm7 \n\t"
"movaps %%xmm0, (%1,%0) \n\t"
"movaps %%xmm3, (%2,%0) \n\t"
"movaps %%xmm4, 16(%1,%0) \n\t"
"movaps %%xmm7, 16(%2,%0) \n\t"
"jg 1b \n\t"
:"+r"(i)
:"r"(p), "r"(p + nloops), "r"(cptr)
@ -141,67 +154,106 @@ void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output,
n4 = n >> 2;
n8 = n >> 3;
asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1));
#ifdef ARCH_X86_64
asm volatile ("movaps %0, %%xmm8\n\t"::"m"(*p1m1p1m1));
#define P1M1P1M1 "%%xmm8"
#else
#define P1M1P1M1 "%4"
#endif
/* 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) {
/* Complex multiplication */
for (k = 0; k < n4; k += 4) {
asm volatile (
"movaps %0, %%xmm0 \n\t" // xmm0 = r0 X r1 X : in2
"movaps %1, %%xmm3 \n\t" // xmm3 = X i1 X i0: in1
"movaps -16+%0, %%xmm4 \n\t" // xmm4 = r0 X r1 X : in2
"movaps 16+%1, %%xmm7 \n\t" // xmm7 = 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
"movlps 8+%2, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos
"movlps 8+%3, %%xmm6 \n\t" // xmm6 = 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
"shufps $95, %%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0
"shufps $160,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0
"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0
"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0
"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0
"xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0
"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = -I1 R1 -I0 R0
"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR
"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 -I1 R0 -I0
"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri -Ii Ri -Ii
"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result
"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result
::"m"(in2[-2*k]), "m"(in1[2*k]),
"m"(tcos[k]), "m"(tsin[k])
#ifndef ARCH_X86_64
,"m"(*p1m1p1m1)
#endif
);
/* 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]])
"movlps %%xmm4, %2 \n\t"
"movhps %%xmm4, %3 \n\t"
:"=m"(z[revtab[k]]), "=m"(z[revtab[k + 1]]),
"=m"(z[revtab[k + 2]]), "=m"(z[revtab[k + 3]])
);
}
ff_fft_calc_sse(&s->fft, z);
/* Not currently needed, added for safety */
asm volatile ("movaps %0, %%xmm7\n\t"::"m"(*p1m1p1m1));
#ifndef ARCH_X86_64
#undef P1M1P1M1
#define P1M1P1M1 "%3"
#endif
/* post rotation + reordering */
for (k = 0; k < n4; k += 2) {
for (k = 0; k < n4; k += 4) {
asm (
"movaps %0, %%xmm0 \n\t" // xmm0 = i1 r1 i0 r0: z
"movaps 16+%0, %%xmm4 \n\t" // xmm4 = i1 r1 i0 r0: z
"movlps %1, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos
"movlps 8+%1, %%xmm5 \n\t" // xmm5 = X X R1 R0: tcos
"movaps %%xmm0, %%xmm3 \n\t" // xmm3 = i1 r1 i0 r0
"movaps %%xmm4, %%xmm7 \n\t" // xmm7 = i1 r1 i0 r0
"movlps %2, %%xmm2 \n\t" // xmm2 = X X I1 I0: tsin
"movlps 8+%2, %%xmm6 \n\t" // xmm6 = 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
"shufps $160,%%xmm4, %%xmm4 \n\t" // xmm4 = r1 r1 r0 r0
"shufps $245,%%xmm7, %%xmm7 \n\t" // xmm7 = i1 i1 i0 i0
"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = I1 R1 I0 R0
"unpcklps %%xmm6, %%xmm5 \n\t" // xmm5 = I1 R1 I0 R0
"movaps %%xmm1, %%xmm2 \n\t" // xmm2 = I1 R1 I0 R0
"xorps %%xmm7, %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
"movaps %%xmm5, %%xmm6 \n\t" // xmm6 = I1 R1 I0 R0
"xorps "P1M1P1M1", %%xmm2 \n\t" // xmm2 = -I1 R1 -I0 R0
"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
"xorps "P1M1P1M1", %%xmm6 \n\t" // xmm6 = -I1 R1 -I0 R0
"mulps %%xmm5, %%xmm4 \n\t" // xmm4 = rI rR rI rR
"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
"shufps $177,%%xmm6, %%xmm6 \n\t" // xmm6 = R1 -I1 R0 -I0
"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
"mulps %%xmm6, %%xmm7 \n\t" // xmm7 = Ri -Ii Ri -Ii
"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result
"addps %%xmm7, %%xmm4 \n\t" // xmm4 = result
"movaps %%xmm0, %0 \n\t"
"movaps %%xmm4, 16+%0 \n\t"
:"+m"(z[k])
:"m"(tcos[k]), "m"(tsin[k])
#ifndef ARCH_X86_64
,"m"(*p1m1p1m1)
#endif
);
}