diff options
Diffstat (limited to 'ffmpeg/libavcodec/ppc/gmc_altivec.c')
| -rw-r--r-- | ffmpeg/libavcodec/ppc/gmc_altivec.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/ppc/gmc_altivec.c b/ffmpeg/libavcodec/ppc/gmc_altivec.c new file mode 100644 index 0000000..4db761d --- /dev/null +++ b/ffmpeg/libavcodec/ppc/gmc_altivec.c @@ -0,0 +1,130 @@ +/* + * GMC (Global Motion Compensation) + * AltiVec-enabled + * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/mem.h" +#include "libavutil/ppc/types_altivec.h" +#include "libavutil/ppc/util_altivec.h" +#include "dsputil_altivec.h" + +/* + altivec-enhanced gmc1. ATM this code assume stride is a multiple of 8, + to preserve proper dst alignment. +*/ +void ff_gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */, int stride, int h, int x16, int y16, int rounder) +{ + const DECLARE_ALIGNED(16, unsigned short, rounder_a) = rounder; + const DECLARE_ALIGNED(16, unsigned short, ABCD)[8] = + { + (16-x16)*(16-y16), /* A */ + ( x16)*(16-y16), /* B */ + (16-x16)*( y16), /* C */ + ( x16)*( y16), /* D */ + 0, 0, 0, 0 /* padding */ + }; + register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0); + register const vector unsigned short vcsr8 = (const vector unsigned short)vec_splat_u16(8); + register vector unsigned char dstv, dstv2, src_0, src_1, srcvA, srcvB, srcvC, srcvD; + register vector unsigned short Av, Bv, Cv, Dv, rounderV, tempA, tempB, tempC, tempD; + int i; + unsigned long dst_odd = (unsigned long)dst & 0x0000000F; + unsigned long src_really_odd = (unsigned long)src & 0x0000000F; + + tempA = vec_ld(0, (const unsigned short*)ABCD); + Av = vec_splat(tempA, 0); + Bv = vec_splat(tempA, 1); + Cv = vec_splat(tempA, 2); + Dv = vec_splat(tempA, 3); + + rounderV = vec_splat((vec_u16)vec_lde(0, &rounder_a), 0); + + // we'll be able to pick-up our 9 char elements + // at src from those 32 bytes + // we load the first batch here, as inside the loop + // we can re-use 'src+stride' from one iteration + // as the 'src' of the next. + src_0 = vec_ld(0, src); + src_1 = vec_ld(16, src); + srcvA = vec_perm(src_0, src_1, vec_lvsl(0, src)); + + if (src_really_odd != 0x0000000F) { + // if src & 0xF == 0xF, then (src+1) is properly aligned + // on the second vector. + srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src)); + } else { + srcvB = src_1; + } + srcvA = vec_mergeh(vczero, srcvA); + srcvB = vec_mergeh(vczero, srcvB); + + for(i=0; i<h; i++) { + dst_odd = (unsigned long)dst & 0x0000000F; + src_really_odd = (((unsigned long)src) + stride) & 0x0000000F; + + dstv = vec_ld(0, dst); + + // we we'll be able to pick-up our 9 char elements + // at src + stride from those 32 bytes + // then reuse the resulting 2 vectors srvcC and srcvD + // as the next srcvA and srcvB + src_0 = vec_ld(stride + 0, src); + src_1 = vec_ld(stride + 16, src); + srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src)); + + if (src_really_odd != 0x0000000F) { + // if src & 0xF == 0xF, then (src+1) is properly aligned + // on the second vector. + srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src)); + } else { + srcvD = src_1; + } + + srcvC = vec_mergeh(vczero, srcvC); + srcvD = vec_mergeh(vczero, srcvD); + + + // OK, now we (finally) do the math :-) + // those four instructions replaces 32 int muls & 32 int adds. + // isn't AltiVec nice ? + tempA = vec_mladd((vector unsigned short)srcvA, Av, rounderV); + tempB = vec_mladd((vector unsigned short)srcvB, Bv, tempA); + tempC = vec_mladd((vector unsigned short)srcvC, Cv, tempB); + tempD = vec_mladd((vector unsigned short)srcvD, Dv, tempC); + + srcvA = srcvC; + srcvB = srcvD; + + tempD = vec_sr(tempD, vcsr8); + + dstv2 = vec_pack(tempD, (vector unsigned short)vczero); + + if (dst_odd) { + dstv2 = vec_perm(dstv, dstv2, vcprm(0,1,s0,s1)); + } else { + dstv2 = vec_perm(dstv, dstv2, vcprm(s0,s1,2,3)); + } + + vec_st(dstv2, 0, dst); + + dst += stride; + src += stride; + } +} |