mirror of https://git.ffmpeg.org/ffmpeg.git
248 lines
8.7 KiB
C
248 lines
8.7 KiB
C
/*
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* FFT/MDCT transform with SSE optimizations
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* Copyright (c) 2002 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "../dsputil.h"
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static const int p1p1p1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 0, 1 << 31 };
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static const int p1p1m1p1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 0 };
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static const int p1p1m1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 1 << 31 };
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static const int p1m1p1m1[4] __attribute__((aligned(16))) =
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{ 0, 1 << 31, 0, 1 << 31 };
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static const int m1m1m1m1[4] __attribute__((aligned(16))) =
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{ 1 << 31, 1 << 31, 1 << 31, 1 << 31 };
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#if 0
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static void print_v4sf(const char *str, __m128 a)
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{
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float *p = (float *)&a;
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printf("%s: %f %f %f %f\n",
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str, p[0], p[1], p[2], p[3]);
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}
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#endif
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/* XXX: handle reverse case */
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void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
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{
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int ln = s->nbits;
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long i, j;
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long nblocks, nloops;
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FFTComplex *p, *cptr;
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asm volatile(
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"movaps %0, %%xmm4 \n\t"
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"movaps %1, %%xmm5 \n\t"
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::"m"(*p1p1m1m1),
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"m"(*(s->inverse ? p1p1m1p1 : p1p1p1m1))
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);
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i = 8 << ln;
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asm volatile(
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"1: \n\t"
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"sub $32, %0 \n\t"
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/* do the pass 0 butterfly */
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"movaps (%0,%1), %%xmm0 \n\t"
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"movaps %%xmm0, %%xmm1 \n\t"
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"shufps $0x4E, %%xmm0, %%xmm0 \n\t"
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"xorps %%xmm4, %%xmm1 \n\t"
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"addps %%xmm1, %%xmm0 \n\t"
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"movaps 16(%0,%1), %%xmm2 \n\t"
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"movaps %%xmm2, %%xmm3 \n\t"
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"shufps $0x4E, %%xmm2, %%xmm2 \n\t"
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"xorps %%xmm4, %%xmm3 \n\t"
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"addps %%xmm3, %%xmm2 \n\t"
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/* multiply third by -i */
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/* by toggling the sign bit */
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"shufps $0xB4, %%xmm2, %%xmm2 \n\t"
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"xorps %%xmm5, %%xmm2 \n\t"
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/* do the pass 1 butterfly */
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"movaps %%xmm0, %%xmm1 \n\t"
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"addps %%xmm2, %%xmm0 \n\t"
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"subps %%xmm2, %%xmm1 \n\t"
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"movaps %%xmm0, (%0,%1) \n\t"
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"movaps %%xmm1, 16(%0,%1) \n\t"
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"jg 1b \n\t"
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:"+r"(i)
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:"r"(z)
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);
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/* pass 2 .. ln-1 */
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nblocks = 1 << (ln-3);
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nloops = 1 << 2;
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cptr = s->exptab1;
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do {
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p = z;
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j = nblocks;
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do {
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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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"movaps (%2,%0), %%xmm1 \n\t"
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"movaps (%1,%0), %%xmm0 \n\t"
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"movaps %%xmm1, %%xmm2 \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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"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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"addps %%xmm2, %%xmm1 \n\t"
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"movaps %%xmm0, %%xmm3 \n\t"
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"addps %%xmm1, %%xmm0 \n\t"
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"subps %%xmm1, %%xmm3 \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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"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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);
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p += nloops*2;
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} while (--j);
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cptr += nloops*2;
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nblocks >>= 1;
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nloops <<= 1;
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} while (nblocks != 0);
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}
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void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output,
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const FFTSample *input, FFTSample *tmp)
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{
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long k, n8, n4, n2, n;
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const uint16_t *revtab = s->fft.revtab;
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const FFTSample *tcos = s->tcos;
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const FFTSample *tsin = s->tsin;
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const FFTSample *in1, *in2;
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FFTComplex *z = (FFTComplex *)tmp;
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n = 1 << s->nbits;
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n2 = n >> 1;
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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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/* 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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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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"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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"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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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = 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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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = 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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);
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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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);
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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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/* post rotation + reordering */
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for (k = 0; k < n4; k += 2) {
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asm (
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"movaps %0, %%xmm0 \n\t" // xmm0 = i1 r1 i0 r0: z
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"movlps %1, %%xmm1 \n\t" // xmm1 = X X R1 R0: tcos
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"movaps %%xmm0, %%xmm3 \n\t" // xmm3 = i1 r1 i0 r0
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"movlps %2, %%xmm2 \n\t" // xmm2 = 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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"unpcklps %%xmm2, %%xmm1 \n\t" // xmm1 = 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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"mulps %%xmm1, %%xmm0 \n\t" // xmm0 = rI rR rI rR
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"shufps $177,%%xmm2, %%xmm2 \n\t" // xmm2 = R1 -I1 R0 -I0
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"mulps %%xmm2, %%xmm3 \n\t" // xmm3 = Ri -Ii Ri -Ii
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"addps %%xmm3, %%xmm0 \n\t" // xmm0 = result
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"movaps %%xmm0, %0 \n\t"
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:"+m"(z[k])
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:"m"(tcos[k]), "m"(tsin[k])
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);
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}
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/*
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Mnemonics:
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0 = z[k].re
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1 = z[k].im
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2 = z[k + 1].re
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3 = z[k + 1].im
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4 = z[-k - 2].re
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5 = z[-k - 2].im
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6 = z[-k - 1].re
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7 = z[-k - 1].im
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*/
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k = 16-n;
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asm volatile("movaps %0, %%xmm7 \n\t"::"m"(*m1m1m1m1));
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asm volatile(
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"1: \n\t"
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"movaps -16(%4,%0), %%xmm1 \n\t" // xmm1 = 4 5 6 7 = z[-2-k]
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"neg %0 \n\t"
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"movaps (%4,%0), %%xmm0 \n\t" // xmm0 = 0 1 2 3 = z[k]
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"xorps %%xmm7, %%xmm0 \n\t" // xmm0 = -0 -1 -2 -3
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"movaps %%xmm0, %%xmm2 \n\t" // xmm2 = -0 -1 -2 -3
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"shufps $141,%%xmm1, %%xmm0 \n\t" // xmm0 = -1 -3 4 6
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"shufps $216,%%xmm1, %%xmm2 \n\t" // xmm2 = -0 -2 5 7
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"shufps $156,%%xmm0, %%xmm0 \n\t" // xmm0 = -1 6 -3 4 !
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"shufps $156,%%xmm2, %%xmm2 \n\t" // xmm2 = -0 7 -2 5 !
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"movaps %%xmm0, (%1,%0) \n\t" // output[2*k]
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"movaps %%xmm2, (%2,%0) \n\t" // output[n2+2*k]
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"neg %0 \n\t"
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"shufps $27, %%xmm0, %%xmm0 \n\t" // xmm0 = 4 -3 6 -1
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"xorps %%xmm7, %%xmm0 \n\t" // xmm0 = -4 3 -6 1 !
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"shufps $27, %%xmm2, %%xmm2 \n\t" // xmm2 = 5 -2 7 -0 !
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"movaps %%xmm0, -16(%2,%0) \n\t" // output[n2-4-2*k]
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"movaps %%xmm2, -16(%3,%0) \n\t" // output[n-4-2*k]
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"add $16, %0 \n\t"
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"jle 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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}
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