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PPC: Altivec split-radix FFT
1.8x faster than altivec radix-2 on a G4 8% faster vorbis decoding Patch (mostly) by Loren Merritt Originally committed as revision 23956 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård
parent
135448fa1a
commit
bf7ba15372
@ -13,10 +13,14 @@ ALTIVEC-OBJS-$(CONFIG_MP3FLOAT_DECODER) += ppc/mpegaudiodec_altivec.o
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ALTIVEC-OBJS-$(CONFIG_MP3ON4FLOAT_DECODER) += ppc/mpegaudiodec_altivec.o
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ALTIVEC-OBJS-$(CONFIG_MP3ADUFLOAT_DECODER) += ppc/mpegaudiodec_altivec.o
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FFT-OBJS-$(HAVE_GNU_AS) += ppc/fft_altivec_s.o \
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ALTIVEC-OBJS-$(CONFIG_FFT) += ppc/fft_altivec.o \
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$(FFT-OBJS-yes)
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OBJS-$(HAVE_ALTIVEC) += ppc/check_altivec.o \
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ppc/dsputil_altivec.o \
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ppc/fdct_altivec.o \
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ppc/fft_altivec.o \
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ppc/float_altivec.o \
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ppc/gmc_altivec.o \
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ppc/idct_altivec.o \
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@ -1,8 +1,7 @@
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/*
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* FFT/IFFT transforms
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* AltiVec-enabled
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* Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
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* Based on code Copyright (c) 2002 Fabrice Bellard
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* Copyright (c) 2009 Loren Merritt
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*
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* This file is part of FFmpeg.
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*
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@ -22,7 +21,8 @@
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*/
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#include "libavcodec/fft.h"
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#include "util_altivec.h"
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#include "dsputil_altivec.h"
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#include "types_altivec.h"
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#include "regs.h"
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/**
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* Do a complex FFT with the parameters defined in ff_fft_init(). The
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@ -31,107 +31,65 @@
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* AltiVec-enabled
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* This code assumes that the 'z' pointer is 16 bytes-aligned
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* It also assumes all FFTComplex are 8 bytes-aligned pair of float
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* The code is exactly the same as the SSE version, except
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* that successive MUL + ADD/SUB have been merged into
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* fused multiply-add ('vec_madd' in altivec)
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*/
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// Pointers to functions. Not using function pointer syntax, because
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// that involves an extra level of indirection on some PPC ABIs.
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extern void *ff_fft_dispatch_altivec[2][15];
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// Convert from simd order to C order.
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static void swizzle(vec_f *z, int n)
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{
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int i;
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n >>= 1;
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for (i = 0; i < n; i += 2) {
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vec_f re = z[i];
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vec_f im = z[i+1];
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z[i] = vec_mergeh(re, im);
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z[i+1] = vec_mergel(re, im);
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}
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}
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static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
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{
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register const vector float vczero = (const vector float)vec_splat_u32(0.);
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int ln = s->nbits;
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int j, np, np2;
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int nblocks, nloops;
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register FFTComplex *p, *q;
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FFTComplex *cptr, *cptr1;
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int k;
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np = 1 << ln;
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{
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vector float *r, a, b, a1, c1, c2;
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r = (vector float *)&z[0];
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c1 = vcii(p,p,n,n);
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if (s->inverse) {
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c2 = vcii(p,p,n,p);
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} else {
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c2 = vcii(p,p,p,n);
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}
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j = (np >> 2);
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do {
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a = vec_ld(0, r);
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a1 = vec_ld(sizeof(vector float), r);
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b = vec_perm(a,a,vcprmle(1,0,3,2));
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a = vec_madd(a,c1,b);
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/* do the pass 0 butterfly */
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b = vec_perm(a1,a1,vcprmle(1,0,3,2));
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b = vec_madd(a1,c1,b);
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/* do the pass 0 butterfly */
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/* multiply third by -i */
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b = vec_perm(b,b,vcprmle(2,3,1,0));
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/* do the pass 1 butterfly */
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vec_st(vec_madd(b,c2,a), 0, r);
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vec_st(vec_nmsub(b,c2,a), sizeof(vector float), r);
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r += 2;
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} while (--j != 0);
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}
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/* pass 2 .. ln-1 */
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nblocks = np >> 3;
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nloops = 1 << 2;
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np2 = np >> 1;
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cptr1 = s->exptab1;
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do {
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p = z;
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q = z + nloops;
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j = nblocks;
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do {
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cptr = cptr1;
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k = nloops >> 1;
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do {
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vector float a,b,c,t1;
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a = vec_ld(0, (float*)p);
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b = vec_ld(0, (float*)q);
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/* complex mul */
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c = vec_ld(0, (float*)cptr);
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/* cre*re cim*re */
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t1 = vec_madd(c, vec_perm(b,b,vcprmle(2,2,0,0)),vczero);
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c = vec_ld(sizeof(vector float), (float*)cptr);
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/* -cim*im cre*im */
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b = vec_madd(c, vec_perm(b,b,vcprmle(3,3,1,1)),t1);
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/* butterfly */
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vec_st(vec_add(a,b), 0, (float*)p);
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vec_st(vec_sub(a,b), 0, (float*)q);
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p += 2;
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q += 2;
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cptr += 4;
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} while (--k);
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p += nloops;
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q += nloops;
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} while (--j);
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cptr1 += nloops * 2;
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nblocks = nblocks >> 1;
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nloops = nloops << 1;
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} while (nblocks != 0);
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register vec_f v14 __asm__("v14") = {0,0,0,0};
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register vec_f v15 __asm__("v15") = *(const vec_f*)ff_cos_16;
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register vec_f v16 __asm__("v16") = {0, 0.38268343, M_SQRT1_2, 0.92387953};
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register vec_f v17 __asm__("v17") = {-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2,-M_SQRT1_2};
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register vec_f v18 __asm__("v18") = { M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2};
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register vec_u8 v19 __asm__("v19") = vcprm(s0,3,2,1);
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register vec_u8 v20 __asm__("v20") = vcprm(0,1,s2,s1);
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register vec_u8 v21 __asm__("v21") = vcprm(2,3,s0,s3);
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register vec_u8 v22 __asm__("v22") = vcprm(2,s3,3,s2);
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register vec_u8 v23 __asm__("v23") = vcprm(0,1,s0,s1);
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register vec_u8 v24 __asm__("v24") = vcprm(2,3,s2,s3);
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register vec_u8 v25 __asm__("v25") = vcprm(2,3,0,1);
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register vec_u8 v26 __asm__("v26") = vcprm(1,2,s3,s0);
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register vec_u8 v27 __asm__("v27") = vcprm(0,3,s2,s1);
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register vec_u8 v28 __asm__("v28") = vcprm(0,2,s1,s3);
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register vec_u8 v29 __asm__("v29") = vcprm(1,3,s0,s2);
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register FFTSample *const*cos_tabs __asm__("r12") = ff_cos_tabs;
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register FFTComplex *zarg __asm__("r3") = z;
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__asm__(
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"mtctr %0 \n"
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"li "r(9)", 16 \n"
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"subi "r(1)","r(1) ",%1 \n"
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"bctrl \n"
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"addi "r(1)","r(1) ",%1 \n"
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::"r"(ff_fft_dispatch_altivec[1][s->nbits-2]), "i"(12*sizeof(void*)),
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"r"(zarg), "r"(cos_tabs),
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"v"(v14),"v"(v15),"v"(v16),"v"(v17),"v"(v18),"v"(v19),"v"(v20),"v"(v21),
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"v"(v22),"v"(v23),"v"(v24),"v"(v25),"v"(v26),"v"(v27),"v"(v28),"v"(v29)
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: "lr","ctr","r0","r4","r5","r6","r7","r8","r9","r10","r11",
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"v0","v1","v2","v3","v4","v5","v6","v7","v8","v9","v10","v11","v12","v13"
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);
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if (s->nbits <= 4)
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swizzle((vec_f*)z, 1<<s->nbits);
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}
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av_cold void ff_fft_init_altivec(FFTContext *s)
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{
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s->fft_calc = ff_fft_calc_altivec;
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s->split_radix = 0;
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if (HAVE_GNU_AS)
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s->fft_calc = ff_fft_calc_altivec;
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s->split_radix = 1;
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}
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335
libavcodec/ppc/fft_altivec_s.S
Normal file
335
libavcodec/ppc/fft_altivec_s.S
Normal file
@ -0,0 +1,335 @@
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/*
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* FFT transform with Altivec optimizations
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* Copyright (c) 2009 Loren Merritt
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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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/*
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* These functions are not individually interchangeable with the C versions.
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* While C takes arrays of FFTComplex, Altivec leaves intermediate results
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* in blocks as convenient to the vector size.
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* i.e. {4x real, 4x imaginary, 4x real, ...}
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*
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* I ignore standard calling convention.
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* Instead, the following registers are treated as global constants:
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* v14: zero
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* v15..v18: cosines
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* v19..v29: permutations
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* r9: 16
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* r12: ff_cos_tabs
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* and the rest are free for local use.
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*/
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#include "config.h"
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#include "asm.S"
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.text
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/* Apple gas doesn't support this shorthand */
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.macro mtctr rx
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mtspr 9, \rx
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.endm
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.macro addi2 ra, imm // add 32-bit immediate
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.if \imm & 0xffff
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addi \ra, \ra, \imm@l
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.endif
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.if (\imm+0x8000)>>16
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addis \ra, \ra, \imm@ha
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.endif
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.endm
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#if ARCH_PPC64
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#define PTR .quad
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.macro LOAD_PTR ra, rbase, offset
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ld \ra,(\offset)*8(\rbase)
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.endm
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.macro STORE_PTR ra, rbase, offset
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std \ra,(\offset)*8(\rbase)
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.endm
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#else
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#define PTR .int
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.macro LOAD_PTR ra, rbase, offset
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lwz \ra,(\offset)*4(\rbase)
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.endm
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.macro STORE_PTR ra, rbase, offset
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stw \ra,(\offset)*4(\rbase)
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.endm
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#endif
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.macro FFT4 a0, a1, a2, a3 // in:0-1 out:2-3
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vperm \a2,\a0,\a1,v20 // vcprm(0,1,s2,s1) // {r0,i0,r3,i2}
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vperm \a3,\a0,\a1,v21 // vcprm(2,3,s0,s3) // {r1,i1,r2,i3}
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vaddfp \a0,\a2,\a3 // {t1,t2,t6,t5}
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vsubfp \a1,\a2,\a3 // {t3,t4,t8,t7}
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vmrghw \a2,\a0,\a1 // vcprm(0,s0,1,s1) // {t1,t3,t2,t4}
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vperm \a3,\a0,\a1,v22 // vcprm(2,s3,3,s2) // {t6,t7,t5,t8}
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vaddfp \a0,\a2,\a3 // {r0,r1,i0,i1}
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vsubfp \a1,\a2,\a3 // {r2,r3,i2,i3}
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vperm \a2,\a0,\a1,v23 // vcprm(0,1,s0,s1) // {r0,r1,r2,r3}
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vperm \a3,\a0,\a1,v24 // vcprm(2,3,s2,s3) // {i0,i1,i2,i3}
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.endm
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.macro FFT4x2 a0, a1, b0, b1, a2, a3, b2, b3
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vperm \a2,\a0,\a1,v20 // vcprm(0,1,s2,s1) // {r0,i0,r3,i2}
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vperm \a3,\a0,\a1,v21 // vcprm(2,3,s0,s3) // {r1,i1,r2,i3}
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vperm \b2,\b0,\b1,v20
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vperm \b3,\b0,\b1,v21
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vaddfp \a0,\a2,\a3 // {t1,t2,t6,t5}
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vsubfp \a1,\a2,\a3 // {t3,t4,t8,t7}
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vaddfp \b0,\b2,\b3
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vsubfp \b1,\b2,\b3
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vmrghw \a2,\a0,\a1 // vcprm(0,s0,1,s1) // {t1,t3,t2,t4}
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vperm \a3,\a0,\a1,v22 // vcprm(2,s3,3,s2) // {t6,t7,t5,t8}
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vmrghw \b2,\b0,\b1
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vperm \b3,\b0,\b1,v22
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vaddfp \a0,\a2,\a3 // {r0,r1,i0,i1}
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vsubfp \a1,\a2,\a3 // {r2,r3,i2,i3}
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vaddfp \b0,\b2,\b3
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vsubfp \b1,\b2,\b3
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vperm \a2,\a0,\a1,v23 // vcprm(0,1,s0,s1) // {r0,r1,r2,r3}
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vperm \a3,\a0,\a1,v24 // vcprm(2,3,s2,s3) // {i0,i1,i2,i3}
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vperm \b2,\b0,\b1,v23
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vperm \b3,\b0,\b1,v24
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.endm
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.macro FFT8 a0, a1, b0, b1, a2, a3, b2, b3, b4 // in,out:a0-b1
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vmrghw \b2,\b0,\b1 // vcprm(0,s0,1,s1) // {r4,r6,i4,i6}
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vmrglw \b3,\b0,\b1 // vcprm(2,s2,3,s3) // {r5,r7,i5,i7}
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vperm \a2,\a0,\a1,v20 // FFT4 ...
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vperm \a3,\a0,\a1,v21
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vaddfp \b0,\b2,\b3 // {t1,t3,t2,t4}
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vsubfp \b1,\b2,\b3 // {r5,r7,i5,i7}
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vperm \b4,\b1,\b1,v25 // vcprm(2,3,0,1) // {i5,i7,r5,r7}
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vaddfp \a0,\a2,\a3
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vsubfp \a1,\a2,\a3
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vmaddfp \b1,\b1,v17,v14 // * {-1,1,1,-1}/sqrt(2)
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vmaddfp \b1,\b4,v18,\b1 // * { 1,1,1,1 }/sqrt(2) // {t8,ta,t7,t9}
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vmrghw \a2,\a0,\a1
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vperm \a3,\a0,\a1,v22
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vperm \b2,\b0,\b1,v26 // vcprm(1,2,s3,s0) // {t3,t2,t9,t8}
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vperm \b3,\b0,\b1,v27 // vcprm(0,3,s2,s1) // {t1,t4,t7,ta}
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vaddfp \a0,\a2,\a3
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vsubfp \a1,\a2,\a3
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vaddfp \b0,\b2,\b3 // {t1,t2,t9,ta}
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vsubfp \b1,\b2,\b3 // {t6,t5,tc,tb}
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vperm \a2,\a0,\a1,v23
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vperm \a3,\a0,\a1,v24
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vperm \b2,\b0,\b1,v28 // vcprm(0,2,s1,s3) // {t1,t9,t5,tb}
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vperm \b3,\b0,\b1,v29 // vcprm(1,3,s0,s2) // {t2,ta,t6,tc}
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vsubfp \b0,\a2,\b2 // {r4,r5,r6,r7}
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vsubfp \b1,\a3,\b3 // {i4,i5,i6,i7}
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vaddfp \a0,\a2,\b2 // {r0,r1,r2,r3}
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vaddfp \a1,\a3,\b3 // {i0,i1,i2,i3}
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.endm
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.macro BF d0,d1,s0,s1
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vsubfp \d1,\s0,\s1
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vaddfp \d0,\s0,\s1
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.endm
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fft4_altivec:
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lvx v0, 0,r3
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lvx v1,r9,r3
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FFT4 v0,v1,v2,v3
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stvx v2, 0,r3
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stvx v3,r9,r3
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blr
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fft8_altivec:
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addi r4,r3,32
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lvx v0, 0,r3
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lvx v1,r9,r3
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lvx v2, 0,r4
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lvx v3,r9,r4
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FFT8 v0,v1,v2,v3,v4,v5,v6,v7,v8
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stvx v0, 0,r3
|
||||
stvx v1,r9,r3
|
||||
stvx v2, 0,r4
|
||||
stvx v3,r9,r4
|
||||
blr
|
||||
|
||||
fft16_altivec:
|
||||
addi r5,r3,64
|
||||
addi r6,r3,96
|
||||
addi r4,r3,32
|
||||
lvx v0, 0,r5
|
||||
lvx v1,r9,r5
|
||||
lvx v2, 0,r6
|
||||
lvx v3,r9,r6
|
||||
FFT4x2 v0,v1,v2,v3,v4,v5,v6,v7
|
||||
lvx v0, 0,r3
|
||||
lvx v1,r9,r3
|
||||
lvx v2, 0,r4
|
||||
lvx v3,r9,r4
|
||||
FFT8 v0,v1,v2,v3,v8,v9,v10,v11,v12
|
||||
vmaddfp v8,v4,v15,v14 // r2*wre
|
||||
vmaddfp v9,v5,v15,v14 // i2*wre
|
||||
vmaddfp v10,v6,v15,v14 // r3*wre
|
||||
vmaddfp v11,v7,v15,v14 // i3*wre
|
||||
vmaddfp v8,v5,v16,v8 // i2*wim
|
||||
vnmsubfp v9,v4,v16,v9 // r2*wim
|
||||
vnmsubfp v10,v7,v16,v10 // i3*wim
|
||||
vmaddfp v11,v6,v16,v11 // r3*wim
|
||||
BF v10,v12,v10,v8
|
||||
BF v11,v13,v9,v11
|
||||
BF v0,v4,v0,v10
|
||||
BF v3,v7,v3,v12
|
||||
stvx v0, 0,r3
|
||||
stvx v4, 0,r5
|
||||
stvx v3,r9,r4
|
||||
stvx v7,r9,r6
|
||||
BF v1,v5,v1,v11
|
||||
BF v2,v6,v2,v13
|
||||
stvx v1,r9,r3
|
||||
stvx v5,r9,r5
|
||||
stvx v2, 0,r4
|
||||
stvx v6, 0,r6
|
||||
blr
|
||||
|
||||
// void pass(float *z, float *wre, int n)
|
||||
.macro PASS interleave, suffix
|
||||
fft_pass\suffix\()_altivec:
|
||||
mtctr r5
|
||||
slwi r0,r5,4
|
||||
slwi r7,r5,6 // o2
|
||||
slwi r5,r5,5 // o1
|
||||
add r10,r5,r7 // o3
|
||||
add r0,r4,r0 // wim
|
||||
addi r6,r5,16 // o1+16
|
||||
addi r8,r7,16 // o2+16
|
||||
addi r11,r10,16 // o3+16
|
||||
1:
|
||||
lvx v8, 0,r4 // wre
|
||||
lvx v10, 0,r0 // wim
|
||||
sub r0,r0,r9
|
||||
lvx v9, 0,r0
|
||||
vperm v9,v9,v10,v19 // vcprm(s0,3,2,1) => wim[0 .. -3]
|
||||
lvx v4,r3,r7 // r2 = z[o2]
|
||||
lvx v5,r3,r8 // i2 = z[o2+16]
|
||||
lvx v6,r3,r10 // r3 = z[o3]
|
||||
lvx v7,r3,r11 // i3 = z[o3+16]
|
||||
vmaddfp v10,v4,v8,v14 // r2*wre
|
||||
vmaddfp v11,v5,v8,v14 // i2*wre
|
||||
vmaddfp v12,v6,v8,v14 // r3*wre
|
||||
vmaddfp v13,v7,v8,v14 // i3*wre
|
||||
lvx v0, 0,r3 // r0 = z[0]
|
||||
lvx v3,r3,r6 // i1 = z[o1+16]
|
||||
vmaddfp v10,v5,v9,v10 // i2*wim
|
||||
vnmsubfp v11,v4,v9,v11 // r2*wim
|
||||
vnmsubfp v12,v7,v9,v12 // i3*wim
|
||||
vmaddfp v13,v6,v9,v13 // r3*wim
|
||||
lvx v1,r3,r9 // i0 = z[16]
|
||||
lvx v2,r3,r5 // r1 = z[o1]
|
||||
BF v12,v8,v12,v10
|
||||
BF v13,v9,v11,v13
|
||||
BF v0,v4,v0,v12
|
||||
BF v3,v7,v3,v8
|
||||
.if !\interleave
|
||||
stvx v0, 0,r3
|
||||
stvx v4,r3,r7
|
||||
stvx v3,r3,r6
|
||||
stvx v7,r3,r11
|
||||
.endif
|
||||
BF v1,v5,v1,v13
|
||||
BF v2,v6,v2,v9
|
||||
.if !\interleave
|
||||
stvx v1,r3,r9
|
||||
stvx v2,r3,r5
|
||||
stvx v5,r3,r8
|
||||
stvx v6,r3,r10
|
||||
.else
|
||||
vmrghw v8,v0,v1
|
||||
vmrglw v9,v0,v1
|
||||
stvx v8, 0,r3
|
||||
stvx v9,r3,r9
|
||||
vmrghw v8,v2,v3
|
||||
vmrglw v9,v2,v3
|
||||
stvx v8,r3,r5
|
||||
stvx v9,r3,r6
|
||||
vmrghw v8,v4,v5
|
||||
vmrglw v9,v4,v5
|
||||
stvx v8,r3,r7
|
||||
stvx v9,r3,r8
|
||||
vmrghw v8,v6,v7
|
||||
vmrglw v9,v6,v7
|
||||
stvx v8,r3,r10
|
||||
stvx v9,r3,r11
|
||||
.endif
|
||||
addi r3,r3,32
|
||||
addi r4,r4,16
|
||||
bdnz 1b
|
||||
sub r3,r3,r5
|
||||
blr
|
||||
.endm
|
||||
|
||||
.macro DECL_FFT suffix, bits, n, n2, n4
|
||||
fft\n\suffix\()_altivec:
|
||||
mflr r0
|
||||
STORE_PTR r0,r1,\bits-5
|
||||
bl fft\n2\()_altivec
|
||||
addi2 r3,\n*4
|
||||
bl fft\n4\()_altivec
|
||||
addi2 r3,\n*2
|
||||
bl fft\n4\()_altivec
|
||||
addi2 r3,\n*-6
|
||||
LOAD_PTR r0,r1,\bits-5
|
||||
LOAD_PTR r4,r12,\bits
|
||||
mtlr r0
|
||||
li r5,\n/16
|
||||
b fft_pass\suffix\()_altivec
|
||||
.endm
|
||||
|
||||
.macro DECL_FFTS interleave, suffix
|
||||
.text
|
||||
PASS \interleave, \suffix
|
||||
DECL_FFT \suffix, 5, 32, 16, 8
|
||||
DECL_FFT \suffix, 6, 64, 32, 16
|
||||
DECL_FFT \suffix, 7, 128, 64, 32
|
||||
DECL_FFT \suffix, 8, 256, 128, 64
|
||||
DECL_FFT \suffix, 9, 512, 256, 128
|
||||
DECL_FFT \suffix,10, 1024, 512, 256
|
||||
DECL_FFT \suffix,11, 2048, 1024, 512
|
||||
DECL_FFT \suffix,12, 4096, 2048, 1024
|
||||
DECL_FFT \suffix,13, 8192, 4096, 2048
|
||||
DECL_FFT \suffix,14,16384, 8192, 4096
|
||||
DECL_FFT \suffix,15,32768,16384, 8192
|
||||
DECL_FFT \suffix,16,65536,32768,16384
|
||||
|
||||
.rodata
|
||||
.global EXTERN_ASM\()ff_fft_dispatch\suffix\()_altivec
|
||||
EXTERN_ASM\()ff_fft_dispatch\suffix\()_altivec:
|
||||
PTR fft4_altivec
|
||||
PTR fft8_altivec
|
||||
PTR fft16_altivec
|
||||
PTR fft32\suffix\()_altivec
|
||||
PTR fft64\suffix\()_altivec
|
||||
PTR fft128\suffix\()_altivec
|
||||
PTR fft256\suffix\()_altivec
|
||||
PTR fft512\suffix\()_altivec
|
||||
PTR fft1024\suffix\()_altivec
|
||||
PTR fft2048\suffix\()_altivec
|
||||
PTR fft4096\suffix\()_altivec
|
||||
PTR fft8192\suffix\()_altivec
|
||||
PTR fft16384\suffix\()_altivec
|
||||
PTR fft32768\suffix\()_altivec
|
||||
PTR fft65536\suffix\()_altivec
|
||||
.endm
|
||||
|
||||
DECL_FFTS 0
|
||||
DECL_FFTS 1, _interleave
|
||||
@ -30,6 +30,7 @@
|
||||
#define vec_s16 vector signed short
|
||||
#define vec_u32 vector unsigned int
|
||||
#define vec_s32 vector signed int
|
||||
#define vec_f vector float
|
||||
|
||||
/***********************************************************************
|
||||
* Null vector
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user