diff options
author | Mans Rullgard <mans@mansr.com> | 2012-10-04 17:30:34 +0100 |
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committer | Mans Rullgard <mans@mansr.com> | 2012-10-05 22:33:32 +0100 |
commit | 07eb7e20af63a244d9e1813626fac38a84e8c869 (patch) | |
tree | b83758778ef483137dac80981d1333083279078b /libswscale/ppc | |
parent | 642b4efaf7b3055ab4b26bda252149eb35babc4b (diff) | |
download | ffmpeg-07eb7e20af63a244d9e1813626fac38a84e8c869.tar.gz |
ppc: swscale: rework yuv2planeX_altivec()
This gets rid of the variable-length scratch buffer by filtering 16
pixels at a time and writing directly to the destination. The extra
loads this requires to load the source values are compensated by not
doing a round-trip to memory before shifting.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libswscale/ppc')
-rw-r--r-- | libswscale/ppc/swscale_altivec.c | 152 |
1 files changed, 63 insertions, 89 deletions
diff --git a/libswscale/ppc/swscale_altivec.c b/libswscale/ppc/swscale_altivec.c index 0e66ec1f7b..7616ddf1fa 100644 --- a/libswscale/ppc/swscale_altivec.c +++ b/libswscale/ppc/swscale_altivec.c @@ -32,78 +32,37 @@ #define vzero vec_splat_s32(0) -static inline void altivec_packIntArrayToCharArray(int *val, uint8_t *dest, - int dstW) +#define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do { \ + vector signed short l2 = vec_ld(((x) << 1) + 16, src); \ + vector signed short ls = vec_perm(l1, l2, perm); \ + vector signed int i1 = vec_mule(filter, ls); \ + vector signed int i2 = vec_mulo(filter, ls); \ + vector signed int vf1 = vec_mergeh(i1, i2); \ + vector signed int vf2 = vec_mergel(i1, i2); \ + d1 = vec_add(d1, vf1); \ + d2 = vec_add(d2, vf2); \ + l1 = l2; \ + } while (0) + +static void yuv2planeX_16_altivec(const int16_t *filter, int filterSize, + const int16_t **src, uint8_t *dest, + const uint8_t *dither, int offset, int x) { - register int i; + register int i, j; + DECLARE_ALIGNED(16, int, val)[16]; + vector signed int vo1, vo2, vo3, vo4; + vector unsigned short vs1, vs2; + vector unsigned char vf; vector unsigned int altivec_vectorShiftInt19 = vec_add(vec_splat_u32(10), vec_splat_u32(9)); - if ((uintptr_t)dest % 16) { - /* badly aligned store, we force store alignment */ - /* and will handle load misalignment on val w/ vec_perm */ - vector unsigned char perm1; - vector signed int v1; - for (i = 0; (i < dstW) && - (((uintptr_t)dest + i) % 16); i++) { - int t = val[i] >> 19; - dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t); - } - perm1 = vec_lvsl(i << 2, val); - v1 = vec_ld(i << 2, val); - for (; i < (dstW - 15); i += 16) { - int offset = i << 2; - vector signed int v2 = vec_ld(offset + 16, val); - vector signed int v3 = vec_ld(offset + 32, val); - vector signed int v4 = vec_ld(offset + 48, val); - vector signed int v5 = vec_ld(offset + 64, val); - vector signed int v12 = vec_perm(v1, v2, perm1); - vector signed int v23 = vec_perm(v2, v3, perm1); - vector signed int v34 = vec_perm(v3, v4, perm1); - vector signed int v45 = vec_perm(v4, v5, perm1); - - vector signed int vA = vec_sra(v12, altivec_vectorShiftInt19); - vector signed int vB = vec_sra(v23, altivec_vectorShiftInt19); - vector signed int vC = vec_sra(v34, altivec_vectorShiftInt19); - vector signed int vD = vec_sra(v45, altivec_vectorShiftInt19); - vector unsigned short vs1 = vec_packsu(vA, vB); - vector unsigned short vs2 = vec_packsu(vC, vD); - vector unsigned char vf = vec_packsu(vs1, vs2); - vec_st(vf, i, dest); - v1 = v5; - } - } else { // dest is properly aligned, great - for (i = 0; i < (dstW - 15); i += 16) { - int offset = i << 2; - vector signed int v1 = vec_ld(offset, val); - vector signed int v2 = vec_ld(offset + 16, val); - vector signed int v3 = vec_ld(offset + 32, val); - vector signed int v4 = vec_ld(offset + 48, val); - vector signed int v5 = vec_sra(v1, altivec_vectorShiftInt19); - vector signed int v6 = vec_sra(v2, altivec_vectorShiftInt19); - vector signed int v7 = vec_sra(v3, altivec_vectorShiftInt19); - vector signed int v8 = vec_sra(v4, altivec_vectorShiftInt19); - vector unsigned short vs1 = vec_packsu(v5, v6); - vector unsigned short vs2 = vec_packsu(v7, v8); - vector unsigned char vf = vec_packsu(vs1, vs2); - vec_st(vf, i, dest); - } - } - for (; i < dstW; i++) { - int t = val[i] >> 19; - dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t); - } -} -// FIXME remove the usage of scratch buffers. -static void yuv2planeX_altivec(const int16_t *filter, int filterSize, - const int16_t **src, uint8_t *dest, int dstW, - const uint8_t *dither, int offset) -{ - register int i, j; - DECLARE_ALIGNED(16, int, val)[dstW]; + for (i = 0; i < 16; i++) + val[i] = dither[(x + i + offset) & 7] << 12; - for (i = 0; i < dstW; i++) - val[i] = dither[(i + offset) & 7] << 12; + vo1 = vec_ld(0, val); + vo2 = vec_ld(16, val); + vo3 = vec_ld(32, val); + vo4 = vec_ld(48, val); for (j = 0; j < filterSize; j++) { vector signed short l1, vLumFilter = vec_ld(j << 1, filter); @@ -111,36 +70,51 @@ static void yuv2planeX_altivec(const int16_t *filter, int filterSize, vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0); vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter - perm = vec_lvsl(0, src[j]); - l1 = vec_ld(0, src[j]); + perm = vec_lvsl(x << 1, src[j]); + l1 = vec_ld(x << 1, src[j]); - for (i = 0; i < (dstW - 7); i += 8) { - int offset = i << 2; - vector signed short l2 = vec_ld((i << 1) + 16, src[j]); + yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter); + yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter); + } - vector signed int v1 = vec_ld(offset, val); - vector signed int v2 = vec_ld(offset + 16, val); + vo1 = vec_sra(vo1, altivec_vectorShiftInt19); + vo2 = vec_sra(vo2, altivec_vectorShiftInt19); + vo3 = vec_sra(vo3, altivec_vectorShiftInt19); + vo4 = vec_sra(vo4, altivec_vectorShiftInt19); + vs1 = vec_packsu(vo1, vo2); + vs2 = vec_packsu(vo3, vo4); + vf = vec_packsu(vs1, vs2); + vec_st(vf, 0, dest); +} - vector signed short ls = vec_perm(l1, l2, perm); // lumSrc[j][i] ... lumSrc[j][i+7] +static inline void yuv2planeX_u(const int16_t *filter, int filterSize, + const int16_t **src, uint8_t *dest, int dstW, + const uint8_t *dither, int offset, int x) +{ + int i, j; - vector signed int i1 = vec_mule(vLumFilter, ls); - vector signed int i2 = vec_mulo(vLumFilter, ls); + for (i = x; i < dstW; i++) { + int t = dither[(i + offset) & 7] << 12; + for (j = 0; j < filterSize; j++) + t += src[j][i] * filter[j]; + dest[i] = av_clip_uint8(t >> 19); + } +} - vector signed int vf1 = vec_mergeh(i1, i2); - vector signed int vf2 = vec_mergel(i1, i2); // lumSrc[j][i] * lumFilter[j] ... lumSrc[j][i+7] * lumFilter[j] +static void yuv2planeX_altivec(const int16_t *filter, int filterSize, + const int16_t **src, uint8_t *dest, int dstW, + const uint8_t *dither, int offset) +{ + int dst_u = -(uintptr_t)dest & 15; + int i; - vector signed int vo1 = vec_add(v1, vf1); - vector signed int vo2 = vec_add(v2, vf2); + yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0); - vec_st(vo1, offset, val); - vec_st(vo2, offset + 16, val); + for (i = dst_u; i < dstW - 15; i += 16) + yuv2planeX_16_altivec(filter, filterSize, src, dest + i, dither, + offset, i); - l1 = l2; - } - for (; i < dstW; i++) - val[i] += src[j][i] * filter[j]; - } - altivec_packIntArrayToCharArray(val, dest, dstW); + yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i); } static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW, |