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* GMC (Global Motion Compensation), AltiVec-enabled
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* Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org>
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* This file is part of Libav.
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* Libav 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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* Libav 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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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; 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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#include "libavutil/mem.h"
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#include "libavutil/ppc/types_altivec.h"
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#include "libavutil/ppc/util_altivec.h"
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#include "libavcodec/mpegvideodsp.h"
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/* AltiVec-enhanced gmc1. ATM this code assumes stride is a multiple of 8
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* to preserve proper dst alignment. */
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static void gmc1_altivec(uint8_t *dst /* align 8 */, uint8_t *src /* align1 */,
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int stride, int h, int x16, int y16, int rounder)
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const DECLARE_ALIGNED(16, unsigned short, rounder_a) = rounder;
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const DECLARE_ALIGNED(16, unsigned short, ABCD)[8] = {
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(16 - x16) * (16 - y16), /* A */
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(x16) * (16 - y16), /* B */
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(16 - x16) * (y16), /* C */
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(x16) * (y16), /* D */
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0, 0, 0, 0 /* padding */
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register const vector unsigned char vczero =
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(const vector unsigned char) vec_splat_u8(0);
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register const vector unsigned short vcsr8 =
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(const vector unsigned short) vec_splat_u16(8);
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register vector unsigned char dstv, dstv2, srcvB, srcvC, srcvD;
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register vector unsigned short tempB, tempC, tempD;
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unsigned long dst_odd = (unsigned long) dst & 0x0000000F;
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unsigned long src_really_odd = (unsigned long) src & 0x0000000F;
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register vector unsigned short tempA =
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vec_ld(0, (const unsigned short *) ABCD);
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register vector unsigned short Av = vec_splat(tempA, 0);
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register vector unsigned short Bv = vec_splat(tempA, 1);
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register vector unsigned short Cv = vec_splat(tempA, 2);
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register vector unsigned short Dv = vec_splat(tempA, 3);
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register vector unsigned short rounderV =
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vec_splat((vec_u16) vec_lde(0, &rounder_a), 0);
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/* we'll be able to pick-up our 9 char elements at src from those
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* 32 bytes we load the first batch here, as inside the loop we can
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* reuse 'src + stride' from one iteration as the 'src' of the next. */
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register vector unsigned char src_0 = vec_ld(0, src);
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register vector unsigned char src_1 = vec_ld(16, src);
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register vector unsigned char srcvA = vec_perm(src_0, src_1,
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if (src_really_odd != 0x0000000F)
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/* If src & 0xF == 0xF, then (src + 1) is properly aligned
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* on the second vector. */
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srcvB = vec_perm(src_0, src_1, vec_lvsl(1, src));
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srcvA = vec_mergeh(vczero, srcvA);
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srcvB = vec_mergeh(vczero, srcvB);
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for (i = 0; i < h; i++) {
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dst_odd = (unsigned long) dst & 0x0000000F;
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src_really_odd = (((unsigned long) src) + stride) & 0x0000000F;
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dstv = vec_ld(0, dst);
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/* We'll be able to pick-up our 9 char elements at src + stride from
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* those 32 bytes then reuse the resulting 2 vectors srvcC and srcvD
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* as the next srcvA and srcvB. */
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src_0 = vec_ld(stride + 0, src);
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src_1 = vec_ld(stride + 16, src);
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srcvC = vec_perm(src_0, src_1, vec_lvsl(stride + 0, src));
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if (src_really_odd != 0x0000000F)
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/* If src & 0xF == 0xF, then (src + 1) is properly aligned
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* on the second vector. */
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srcvD = vec_perm(src_0, src_1, vec_lvsl(stride + 1, src));
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srcvC = vec_mergeh(vczero, srcvC);
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srcvD = vec_mergeh(vczero, srcvD);
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/* OK, now we (finally) do the math :-)
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* Those four instructions replace 32 int muls & 32 int adds.
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* Isn't AltiVec nice? */
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tempA = vec_mladd((vector unsigned short) srcvA, Av, rounderV);
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tempB = vec_mladd((vector unsigned short) srcvB, Bv, tempA);
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tempC = vec_mladd((vector unsigned short) srcvC, Cv, tempB);
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tempD = vec_mladd((vector unsigned short) srcvD, Dv, tempC);
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tempD = vec_sr(tempD, vcsr8);
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dstv2 = vec_pack(tempD, (vector unsigned short) vczero);
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dstv2 = vec_perm(dstv, dstv2, vcprm(0, 1, s0, s1));
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dstv2 = vec_perm(dstv, dstv2, vcprm(s0, s1, 2, 3));
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vec_st(dstv2, 0, dst);
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#endif /* HAVE_ALTIVEC */
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av_cold void ff_mpegvideodsp_init_ppc(MpegVideoDSPContext *c)
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c->gmc1 = gmc1_altivec;
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#endif /* HAVE_ALTIVEC */
added
removed
libavcodec/ppc/mpegvideodsp.c
