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FFmpeg/libavcodec/x86/hevc_sao.asm
Lynne bbe95f7353
x86: replace explicit REP_RETs with RETs 
From x86inc:
> On AMD cpus <=K10, an ordinary ret is slow if it immediately follows either
> a branch or a branch target. So switch to a 2-byte form of ret in that case.
> We can automatically detect "follows a branch", but not a branch target.
> (SSSE3 is a sufficient condition to know that your cpu doesn't have this problem.)

x86inc can automatically determine whether to use REP_RET rather than
REP in most of these cases, so impact is minimal. Additionally, a few
REP_RETs were used unnecessary, despite the return being nowhere near a
branch.

The only CPUs affected were AMD K10s, made between 2007 and 2011, 16
years ago and 12 years ago, respectively.

In the future, everyone involved with x86inc should consider dropping
REP_RETs altogether.
2023-02-01 04:23:55 +01:00

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;******************************************************************************
;* SIMD optimized SAO functions for HEVC 8bit decoding
;*
;* Copyright (c) 2013 Pierre-Edouard LEPERE
;* Copyright (c) 2014 James Almer
;*
;* 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 32
pb_edge_shuffle: times 2 db 1, 2, 0, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
pb_eo: db -1, 0, 1, 0, 0, -1, 0, 1, -1, -1, 1, 1, 1, -1, -1, 1
cextern pb_1
cextern pb_2
SECTION .text
;******************************************************************************
;SAO Band Filter
;******************************************************************************
%macro HEVC_SAO_BAND_FILTER_INIT 0
and leftq, 31
movd xm0, leftd
add leftq, 1
and leftq, 31
movd xm1, leftd
add leftq, 1
and leftq, 31
movd xm2, leftd
add leftq, 1
and leftq, 31
movd xm3, leftd
SPLATW m0, xm0
SPLATW m1, xm1
SPLATW m2, xm2
SPLATW m3, xm3
%if mmsize > 16
SPLATW m4, [offsetq + 2]
SPLATW m5, [offsetq + 4]
SPLATW m6, [offsetq + 6]
SPLATW m7, [offsetq + 8]
%else
movq m7, [offsetq + 2]
SPLATW m4, m7, 0
SPLATW m5, m7, 1
SPLATW m6, m7, 2
SPLATW m7, m7, 3
%endif
%if ARCH_X86_64
pxor m14, m14
%else ; ARCH_X86_32
mova [rsp+mmsize*0], m0
mova [rsp+mmsize*1], m1
mova [rsp+mmsize*2], m2
mova [rsp+mmsize*3], m3
mova [rsp+mmsize*4], m4
mova [rsp+mmsize*5], m5
mova [rsp+mmsize*6], m6
pxor m0, m0
%assign MMSIZE mmsize
%define m14 m0
%define m13 m1
%define m9 m2
%define m8 m3
%endif ; ARCH
DEFINE_ARGS dst, src, dststride, srcstride, offset, height
mov heightd, r7m
%endmacro
%macro HEVC_SAO_BAND_FILTER_COMPUTE 2
psraw %1, %2, 3
%if ARCH_X86_64
pcmpeqw m10, %1, m0
pcmpeqw m11, %1, m1
pcmpeqw m12, %1, m2
pcmpeqw %1, m3
pand m10, m4
pand m11, m5
pand m12, m6
pand %1, m7
por m10, m11
por m12, %1
por m10, m12
paddw %2, m10
%else ; ARCH_X86_32
pcmpeqw m4, %1, [rsp+MMSIZE*0]
pcmpeqw m5, %1, [rsp+MMSIZE*1]
pcmpeqw m6, %1, [rsp+MMSIZE*2]
pcmpeqw %1, [rsp+MMSIZE*3]
pand m4, [rsp+MMSIZE*4]
pand m5, [rsp+MMSIZE*5]
pand m6, [rsp+MMSIZE*6]
pand %1, m7
por m4, m5
por m6, %1
por m4, m6
paddw %2, m4
%endif ; ARCH
%endmacro
;void ff_hevc_sao_band_filter_<width>_8_<opt>(uint8_t *_dst, const uint8_t *_src, ptrdiff_t _stride_dst, ptrdiff_t _stride_src,
; int16_t *sao_offset_val, int sao_left_class, int width, int height);
%macro HEVC_SAO_BAND_FILTER 2
cglobal hevc_sao_band_filter_%1_8, 6, 6, 15, 7*mmsize*ARCH_X86_32, dst, src, dststride, srcstride, offset, left
HEVC_SAO_BAND_FILTER_INIT
align 16
.loop:
%if %1 == 8
movq m8, [srcq]
punpcklbw m8, m14
HEVC_SAO_BAND_FILTER_COMPUTE m9, m8
packuswb m8, m14
movq [dstq], m8
%endif ; %1 == 8
%assign i 0
%rep %2
mova m13, [srcq + i]
punpcklbw m8, m13, m14
HEVC_SAO_BAND_FILTER_COMPUTE m9, m8
punpckhbw m13, m14
HEVC_SAO_BAND_FILTER_COMPUTE m9, m13
packuswb m8, m13
mova [dstq + i], m8
%assign i i+mmsize
%endrep
%if %1 == 48
INIT_XMM cpuname
mova m13, [srcq + i]
punpcklbw m8, m13, m14
HEVC_SAO_BAND_FILTER_COMPUTE m9, m8
punpckhbw m13, m14
HEVC_SAO_BAND_FILTER_COMPUTE m9, m13
packuswb m8, m13
mova [dstq + i], m8
%if cpuflag(avx2)
INIT_YMM cpuname
%endif
%endif ; %1 == 48
add dstq, dststrideq ; dst += dststride
add srcq, srcstrideq ; src += srcstride
dec heightd ; cmp height
jnz .loop ; height loop
RET
%endmacro
%macro HEVC_SAO_BAND_FILTER_FUNCS 0
HEVC_SAO_BAND_FILTER 8, 0
HEVC_SAO_BAND_FILTER 16, 1
HEVC_SAO_BAND_FILTER 32, 2
HEVC_SAO_BAND_FILTER 48, 2
HEVC_SAO_BAND_FILTER 64, 4
%endmacro
INIT_XMM sse2
HEVC_SAO_BAND_FILTER_FUNCS
INIT_XMM avx
HEVC_SAO_BAND_FILTER_FUNCS
%if HAVE_AVX2_EXTERNAL
INIT_XMM avx2
HEVC_SAO_BAND_FILTER 8, 0
HEVC_SAO_BAND_FILTER 16, 1
INIT_YMM avx2
HEVC_SAO_BAND_FILTER 32, 1
HEVC_SAO_BAND_FILTER 48, 1
HEVC_SAO_BAND_FILTER 64, 2
%endif
;******************************************************************************
;SAO Edge Filter
;******************************************************************************
%define MAX_PB_SIZE 64
%define PADDING_SIZE 64 ; AV_INPUT_BUFFER_PADDING_SIZE
%define EDGE_SRCSTRIDE 2 * MAX_PB_SIZE + PADDING_SIZE
%macro HEVC_SAO_EDGE_FILTER_INIT 0
%if WIN64
movsxd eoq, dword eom
%elif ARCH_X86_64
movsxd eoq, eod
%else
mov eoq, r4m
%endif
lea tmp2q, [pb_eo]
movsx a_strideq, byte [tmp2q+eoq*4+1]
movsx b_strideq, byte [tmp2q+eoq*4+3]
imul a_strideq, EDGE_SRCSTRIDE
imul b_strideq, EDGE_SRCSTRIDE
movsx tmpq, byte [tmp2q+eoq*4]
add a_strideq, tmpq
movsx tmpq, byte [tmp2q+eoq*4+2]
add b_strideq, tmpq
%endmacro
%macro HEVC_SAO_EDGE_FILTER_COMPUTE 1
pminub m4, m1, m2
pminub m5, m1, m3
pcmpeqb m2, m4
pcmpeqb m3, m5
pcmpeqb m4, m1
pcmpeqb m5, m1
psubb m4, m2
psubb m5, m3
paddb m4, m6
paddb m4, m5
pshufb m2, m0, m4
%if %1 > 8
punpckhbw m5, m7, m1
punpckhbw m4, m2, m7
punpcklbw m3, m7, m1
punpcklbw m2, m7
pmaddubsw m5, m4
pmaddubsw m3, m2
packuswb m3, m5
%else
punpcklbw m3, m7, m1
punpcklbw m2, m7
pmaddubsw m3, m2
packuswb m3, m3
%endif
%endmacro
;void ff_hevc_sao_edge_filter_<width>_8_<opt>(uint8_t *_dst, uint8_t *_src, ptrdiff_t stride_dst, int16_t *sao_offset_val,
; int eo, int width, int height);
%macro HEVC_SAO_EDGE_FILTER 2-3
%if ARCH_X86_64
cglobal hevc_sao_edge_filter_%1_8, 4, 9, 8, dst, src, dststride, offset, eo, a_stride, b_stride, height, tmp
%define tmp2q heightq
HEVC_SAO_EDGE_FILTER_INIT
mov heightd, r6m
%else ; ARCH_X86_32
cglobal hevc_sao_edge_filter_%1_8, 1, 6, 8, dst, src, dststride, a_stride, b_stride, height
%define eoq srcq
%define tmpq heightq
%define tmp2q dststrideq
%define offsetq heightq
HEVC_SAO_EDGE_FILTER_INIT
mov srcq, srcm
mov offsetq, r3m
mov dststrideq, dststridem
%endif ; ARCH
%if mmsize > 16
vbroadcasti128 m0, [offsetq]
%else
movu m0, [offsetq]
%endif
mova m1, [pb_edge_shuffle]
packsswb m0, m0
mova m7, [pb_1]
pshufb m0, m1
mova m6, [pb_2]
%if ARCH_X86_32
mov heightd, r6m
%endif
align 16
.loop:
%if %1 == 8
movq m1, [srcq]
movq m2, [srcq + a_strideq]
movq m3, [srcq + b_strideq]
HEVC_SAO_EDGE_FILTER_COMPUTE %1
movq [dstq], m3
%endif
%assign i 0
%rep %2
mova m1, [srcq + i]
movu m2, [srcq + a_strideq + i]
movu m3, [srcq + b_strideq + i]
HEVC_SAO_EDGE_FILTER_COMPUTE %1
mov%3 [dstq + i], m3
%assign i i+mmsize
%endrep
%if %1 == 48
INIT_XMM cpuname
mova m1, [srcq + i]
movu m2, [srcq + a_strideq + i]
movu m3, [srcq + b_strideq + i]
HEVC_SAO_EDGE_FILTER_COMPUTE %1
mova [dstq + i], m3
%if cpuflag(avx2)
INIT_YMM cpuname
%endif
%endif
add dstq, dststrideq
add srcq, EDGE_SRCSTRIDE
dec heightd
jg .loop
RET
%endmacro
INIT_XMM ssse3
HEVC_SAO_EDGE_FILTER 8, 0
HEVC_SAO_EDGE_FILTER 16, 1, a
HEVC_SAO_EDGE_FILTER 32, 2, a
HEVC_SAO_EDGE_FILTER 48, 2, a
HEVC_SAO_EDGE_FILTER 64, 4, a
%if HAVE_AVX2_EXTERNAL
INIT_YMM avx2
HEVC_SAO_EDGE_FILTER 32, 1, a
HEVC_SAO_EDGE_FILTER 48, 1, u
HEVC_SAO_EDGE_FILTER 64, 2, a
%endif
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