[FFmpeg-devel] [PATCH 2/2] libswscale: Adds ff_hscale8to15_4_avx2 and ff_hscale8to15_X4_avx2 for all filter sizes.
Alan Kelly
alankelly at google.com
Wed Jul 21 12:11:26 EEST 2021
On Fri, Jul 16, 2021 at 3:48 PM Alan Kelly <alankelly at google.com> wrote:
> These functions replace all ff_hscale8to15_*_ssse3 when avx2 is available.
> ---
> EXTERNAL_AVX2_FAST is now used instead of EXTERNAL_AVX2_FAST_GATHER as
> discussed in the email thread for part 1 of this patch.
>
> Benchmark results on Skylake and Haswell:
>
> Skylake Haswell
> hscale_8_to_15_width4_ssse3 761.2 760
> hscale_8_to_15_width4_avx2 468.7 957
> hscale_8_to_15_width8_ssse3 1170.7 1032
> hscale_8_to_15_width8_avx2 865.7 1979
> hscale_8_to_15_width12_ssse3 2172.2 2472
> hscale_8_to_15_width12_avx2 1245.7 2901
> hscale_8_to_15_width16_ssse3 2244.2 2400
> hscale_8_to_15_width16_avx2 1647.2 3681
>
> libswscale/swscale_internal.h | 2 +
> libswscale/utils.c | 37 +++++++++++
> libswscale/x86/Makefile | 1 +
> libswscale/x86/scale_avx2.asm | 112 ++++++++++++++++++++++++++++++++++
> libswscale/x86/swscale.c | 19 ++++++
> tests/checkasm/sw_scale.c | 20 ++++--
> 6 files changed, 186 insertions(+), 5 deletions(-)
> create mode 100644 libswscale/x86/scale_avx2.asm
>
> diff --git a/libswscale/swscale_internal.h b/libswscale/swscale_internal.h
> index 673407636a..fba3dabe5b 100644
> --- a/libswscale/swscale_internal.h
> +++ b/libswscale/swscale_internal.h
> @@ -1064,4 +1064,6 @@ void ff_init_vscale_pfn(SwsContext *c,
> yuv2planar1_fn yuv2plane1, yuv2planarX_fn
> //number of extra lines to process
> #define MAX_LINES_AHEAD 4
>
> +//shuffle filter and filterPos for hyScale and hcScale filters in avx2
> +void ff_shuffle_filter_coefficients(SwsContext *c, int* filterPos, int
> filterSize, int16_t *filter, int dstW);
> #endif /* SWSCALE_SWSCALE_INTERNAL_H */
> diff --git a/libswscale/utils.c b/libswscale/utils.c
> index 176fc6fd63..0577fd5490 100644
> --- a/libswscale/utils.c
> +++ b/libswscale/utils.c
> @@ -268,6 +268,41 @@ static const FormatEntry format_entries[] = {
> [AV_PIX_FMT_X2RGB10LE] = { 1, 1 },
> };
>
> +void ff_shuffle_filter_coefficients(SwsContext *c, int *filterPos, int
> filterSize, int16_t *filter, int dstW){
> +#if ARCH_X86_64
> + int i, j, k, l;
> + int cpu_flags = av_get_cpu_flags();
> + if (EXTERNAL_AVX2_FAST(cpu_flags)){
> + if ((c->srcBpc == 8) && (c->dstBpc <= 14)){
> + if (dstW % 16 == 0){
> + if (filter != NULL){
> + for (i = 0; i < dstW; i += 8){
> + FFSWAP(int, filterPos[i + 2], filterPos[i+4]);
> + FFSWAP(int, filterPos[i + 3], filterPos[i+5]);
> + }
> + if (filterSize > 4){
> + int16_t *tmp2 = av_malloc(dstW * filterSize * 2);
> + memcpy(tmp2, filter, dstW * filterSize * 2);
> + for (i = 0; i < dstW; i += 16){//pixel
> + for (k = 0; k < filterSize / 4; ++k){//fcoeff
> + for (j = 0; j < 16; ++j){//inner pixel
> + for (l = 0; l < 4; ++l){//coeff
> + int from = i * filterSize + j *
> filterSize + k * 4 + l;
> + int to = (i) * filterSize + j * 4
> + l + k * 64;
> + filter[to] = tmp2[from];
> + }
> + }
> + }
> + }
> + av_free(tmp2);
> + }
> + }
> + }
> + }
> + }
> +#endif
> +}
> +
> int sws_isSupportedInput(enum AVPixelFormat pix_fmt)
> {
> return (unsigned)pix_fmt < FF_ARRAY_ELEMS(format_entries) ?
> @@ -1699,6 +1734,7 @@ av_cold int sws_init_context(SwsContext *c,
> SwsFilter *srcFilter,
> get_local_pos(c, 0, 0, 0),
> get_local_pos(c, 0, 0, 0))) < 0)
> goto fail;
> + ff_shuffle_filter_coefficients(c, c->hLumFilterPos,
> c->hLumFilterSize, c->hLumFilter, dstW);
> if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,
> &c->hChrFilterSize, c->chrXInc,
> c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
> @@ -1708,6 +1744,7 @@ av_cold int sws_init_context(SwsContext *c,
> SwsFilter *srcFilter,
> get_local_pos(c, c->chrSrcHSubSample,
> c->src_h_chr_pos, 0),
> get_local_pos(c, c->chrDstHSubSample,
> c->dst_h_chr_pos, 0))) < 0)
> goto fail;
> + ff_shuffle_filter_coefficients(c, c->hChrFilterPos,
> c->hChrFilterSize, c->hChrFilter, c->chrDstW);
> }
> } // initialize horizontal stuff
>
> diff --git a/libswscale/x86/Makefile b/libswscale/x86/Makefile
> index bfe383364e..68391494be 100644
> --- a/libswscale/x86/Makefile
> +++ b/libswscale/x86/Makefile
> @@ -11,6 +11,7 @@ OBJS-$(CONFIG_XMM_CLOBBER_TEST) += x86/w64xmmtest.o
> X86ASM-OBJS += x86/input.o \
> x86/output.o \
> x86/scale.o \
> + x86/scale_avx2.o
> \
> x86/rgb_2_rgb.o \
> x86/yuv_2_rgb.o \
> x86/yuv2yuvX.o \
> diff --git a/libswscale/x86/scale_avx2.asm b/libswscale/x86/scale_avx2.asm
> new file mode 100644
> index 0000000000..d90fd2d791
> --- /dev/null
> +++ b/libswscale/x86/scale_avx2.asm
> @@ -0,0 +1,112 @@
>
> +;******************************************************************************
> +;* x86-optimized horizontal line scaling functions
> +;* Copyright 2020 Google LLC
> +;* Copyright (c) 2011 Ronald S. Bultje <rsbultje at gmail.com>
> +;*
> +;* 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/x86/x86util.asm"
> +
> +SECTION_RODATA
> +
> +swizzle: dd 0, 4, 1, 5, 2, 6, 3, 7
> +four: times 8 dd 4
> +
> +SECTION .text
> +
>
> +;-----------------------------------------------------------------------------
> +; horizontal line scaling
> +;
> +; void hscale8to15_<filterSize>_<opt>
> +; (SwsContext *c, int16_t *dst,
> +; int dstW, const uint8_t *src,
> +; const int16_t *filter,
> +; const int32_t *filterPos, int filterSize);
> +;
> +; Scale one horizontal line. Input is 8-bit width Filter is 14 bits.
> Output is
> +; 15 bits (in int16_t). Each output pixel is generated from $filterSize
> input
> +; pixels, the position of the first pixel is given in
> filterPos[nOutputPixel].
>
> +;-----------------------------------------------------------------------------
> +
> +%macro SCALE_FUNC 1
> +cglobal hscale8to15_%1, 7, 9, 15, pos0, dst, w, srcmem, filter, fltpos,
> fltsize, count, inner
> + pxor m0, m0
> + movu m15, [swizzle]
> + mov countq, $0
> +%ifidn %1, X4
> + movu m14, [four]
> + movsxd fltsizeq, fltsized
> + shr fltsizeq, 2
> +%endif
> +.loop:
> + movu m1, [fltposq]
> + movu m2, [fltposq+32]
> +%ifidn %1, X4
> + pxor m9, m9
> + pxor m10, m10
> + pxor m11, m11
> + pxor m12, m12
> + mov innerq, $0
> +.innerloop:
> +%endif
> + vpcmpeqd m13, m13
> + vpgatherdd m3,[srcmemq + m1], m13
> + vpcmpeqd m13, m13
> + vpgatherdd m4,[srcmemq + m2], m13
> + vpunpcklbw m5, m3, m0
> + vpunpckhbw m6, m3, m0
> + vpunpcklbw m7, m4, m0
> + vpunpckhbw m8, m4, m0
> + vpmaddwd m5, m5, [filterq]
> + vpmaddwd m6, m6, [filterq + 32]
> + vpmaddwd m7, m7, [filterq + 64]
> + vpmaddwd m8, m8, [filterq + 96]
> + add filterq, $80
> +%ifidn %1, X4
> + paddd m9, m5
> + paddd m10, m6
> + paddd m11, m7
> + paddd m12, m8
> + paddd m1, m14
> + paddd m2, m14
> + add innerq, $1
> + cmp innerq, fltsizeq
> + jl .innerloop
> + vphaddd m5, m9, m10
> + vphaddd m6, m11, m12
> +%else
> + vphaddd m5, m5, m6
> + vphaddd m6, m7, m8
> +%endif
> + vpsrad m5, 7
> + vpsrad m6, 7
> + vpackssdw m5, m5, m6
> + vpermd m5, m15, m5
> + vmovdqu [dstq + countq * 2], m5
> + add fltposq, $40
> + add countq, $10
> + cmp countq, wq
> + jl .loop
> +REP_RET
> +%endmacro
> +
> +%if ARCH_X86_64
> +INIT_YMM avx2
> +SCALE_FUNC 4
> +SCALE_FUNC X4
> +%endif
> diff --git a/libswscale/x86/swscale.c b/libswscale/x86/swscale.c
> index 0848a31461..164b06d6ba 100644
> --- a/libswscale/x86/swscale.c
> +++ b/libswscale/x86/swscale.c
> @@ -276,6 +276,9 @@ SCALE_FUNCS_SSE(sse2);
> SCALE_FUNCS_SSE(ssse3);
> SCALE_FUNCS_SSE(sse4);
>
> +SCALE_FUNC(4, 8, 15, avx2);
> +SCALE_FUNC(X4, 8, 15, avx2);
> +
> #define VSCALEX_FUNC(size, opt) \
> void ff_yuv2planeX_ ## size ## _ ## opt(const int16_t *filter, int
> filterSize, \
> const int16_t **src, uint8_t
> *dest, int dstW, \
> @@ -568,6 +571,22 @@ switch(c->dstBpc){ \
> }
>
> #if ARCH_X86_64
> +#define ASSIGN_AVX2_SCALE_FUNC(hscalefn, filtersize) \
> + switch (filtersize) { \
> + case 4: hscalefn = ff_hscale8to15_4_avx2; break; \
> + default: hscalefn = ff_hscale8to15_X4_avx2; break; \
> + break; \
> + }
> +
> + if (EXTERNAL_AVX2_FAST(cpu_flags)){
> + if ((c->srcBpc == 8) && (c->dstBpc <= 14)){
> + if(c->chrDstW % 16 == 0)
> + ASSIGN_AVX2_SCALE_FUNC(c->hcScale, c->hChrFilterSize);
> + if(c->dstW % 16 == 0)
> + ASSIGN_AVX2_SCALE_FUNC(c->hyScale, c->hLumFilterSize);
> + }
> + }
> +
> if (EXTERNAL_AVX2_FAST(cpu_flags)) {
> switch (c->dstFormat) {
> case AV_PIX_FMT_NV12:
> diff --git a/tests/checkasm/sw_scale.c b/tests/checkasm/sw_scale.c
> index 40c5eb3aa8..103b1aa5da 100644
> --- a/tests/checkasm/sw_scale.c
> +++ b/tests/checkasm/sw_scale.c
> @@ -135,13 +135,13 @@ static void check_yuv2yuvX(void)
> }
>
> #undef SRC_PIXELS
> -#define SRC_PIXELS 128
> +#define SRC_PIXELS 512
>
> static void check_hscale(void)
> {
> #define MAX_FILTER_WIDTH 40
> -#define FILTER_SIZES 5
> - static const int filter_sizes[FILTER_SIZES] = { 4, 8, 16, 32, 40 };
> +#define FILTER_SIZES 6
> + static const int filter_sizes[FILTER_SIZES] = { 4, 8, 12, 16, 32, 40
> };
>
> #define HSCALE_PAIRS 2
> static const int hscale_pairs[HSCALE_PAIRS][2] = {
> @@ -160,6 +160,8 @@ static void check_hscale(void)
> // padded
> LOCAL_ALIGNED_32(int16_t, filter, [SRC_PIXELS * MAX_FILTER_WIDTH +
> MAX_FILTER_WIDTH]);
> LOCAL_ALIGNED_32(int32_t, filterPos, [SRC_PIXELS]);
> + LOCAL_ALIGNED_32(int16_t, filterAvx2, [SRC_PIXELS * MAX_FILTER_WIDTH
> + MAX_FILTER_WIDTH]);
> + LOCAL_ALIGNED_32(int32_t, filterPosAvx, [SRC_PIXELS]);
>
> // The dst parameter here is either int16_t or int32_t but we use
> void* to
> // just cover both cases.
> @@ -167,6 +169,8 @@ static void check_hscale(void)
> const uint8_t *src, const int16_t *filter,
> const int32_t *filterPos, int filterSize);
>
> + int cpu_flags = av_get_cpu_flags();
> +
> ctx = sws_alloc_context();
> if (sws_init_context(ctx, NULL, NULL) < 0)
> fail();
> @@ -180,9 +184,11 @@ static void check_hscale(void)
> ctx->srcBpc = hscale_pairs[hpi][0];
> ctx->dstBpc = hscale_pairs[hpi][1];
> ctx->hLumFilterSize = ctx->hChrFilterSize = width;
> + ctx->dstW = ctx->chrDstW = SRC_PIXELS;
>
> for (i = 0; i < SRC_PIXELS; i++) {
> filterPos[i] = i;
> + filterPosAvx[i] = i;
>
> // These filter cofficients are chosen to try break two
> corner
> // cases, namely:
> @@ -211,16 +217,20 @@ static void check_hscale(void)
> filter[SRC_PIXELS * width + i] = rnd();
> }
> ff_sws_init_scale(ctx);
> + memcpy(filterAvx2, filter, sizeof(uint16_t) * (SRC_PIXELS *
> MAX_FILTER_WIDTH + MAX_FILTER_WIDTH));
> + if (cpu_flags & AV_CPU_FLAG_AVX2){
> + ff_shuffle_filter_coefficients(ctx, filterPosAvx, width,
> filterAvx2, SRC_PIXELS);
> + }
>
> if (check_func(ctx->hcScale, "hscale_%d_to_%d_width%d",
> ctx->srcBpc, ctx->dstBpc + 1, width)) {
> memset(dst0, 0, SRC_PIXELS * sizeof(dst0[0]));
> memset(dst1, 0, SRC_PIXELS * sizeof(dst1[0]));
>
> call_ref(NULL, dst0, SRC_PIXELS, src, filter, filterPos,
> width);
> - call_new(NULL, dst1, SRC_PIXELS, src, filter, filterPos,
> width);
> + call_new(NULL, dst1, SRC_PIXELS, src, filterAvx2,
> filterPosAvx, width);
> if (memcmp(dst0, dst1, SRC_PIXELS * sizeof(dst0[0])))
> fail();
> - bench_new(NULL, dst0, SRC_PIXELS, src, filter, filterPos,
> width);
> + bench_new(NULL, dst0, SRC_PIXELS, src, filter,
> filterPosAvx, width);
> }
> }
> }
> --
> 2.32.0.402.g57bb445576-goog
>
>
Part 1 of this patch has been abandoned as it is no longer required. Are
there any further comments on this patch or can it be merged?
Thanks
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