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https://git.ffmpeg.org/ffmpeg.git
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bbe95f7353
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.
285 lines
6.2 KiB
NASM
285 lines
6.2 KiB
NASM
;*****************************************************************************
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;* SSE2-optimized weighted prediction code
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;*****************************************************************************
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;* Copyright (c) 2004-2005 Michael Niedermayer, Loren Merritt
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;* Copyright (C) 2010 Eli Friedman <eli.friedman@gmail.com>
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;*
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;* This file is part of FFmpeg.
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;*
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;* FFmpeg 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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;*
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;* FFmpeg 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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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with FFmpeg; 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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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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SECTION .text
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;-----------------------------------------------------------------------------
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; biweight pred:
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;
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; void ff_h264_biweight_16_sse2(uint8_t *dst, uint8_t *src, int stride,
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; int height, int log2_denom, int weightd,
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; int weights, int offset);
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; and
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; void ff_h264_weight_16_sse2(uint8_t *dst, int stride, int height,
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; int log2_denom, int weight, int offset);
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;-----------------------------------------------------------------------------
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%macro WEIGHT_SETUP 0
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add r5, r5
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inc r5
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movd m3, r4d
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movd m5, r5d
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movd m6, r3d
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pslld m5, m6
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psrld m5, 1
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%if mmsize == 16
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pshuflw m3, m3, 0
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pshuflw m5, m5, 0
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punpcklqdq m3, m3
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punpcklqdq m5, m5
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%else
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pshufw m3, m3, 0
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pshufw m5, m5, 0
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%endif
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pxor m7, m7
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%endmacro
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%macro WEIGHT_OP 2
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movh m0, [r0+%1]
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movh m1, [r0+%2]
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punpcklbw m0, m7
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punpcklbw m1, m7
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pmullw m0, m3
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pmullw m1, m3
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paddsw m0, m5
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paddsw m1, m5
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psraw m0, m6
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psraw m1, m6
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packuswb m0, m1
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%endmacro
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%macro WEIGHT_FUNC_MM 2
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cglobal h264_weight_%1, 6, 6, %2
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WEIGHT_SETUP
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.nextrow:
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WEIGHT_OP 0, mmsize/2
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mova [r0], m0
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add r0, r1
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dec r2d
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jnz .nextrow
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RET
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%endmacro
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INIT_XMM sse2
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WEIGHT_FUNC_MM 16, 8
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%macro WEIGHT_FUNC_HALF_MM 2
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cglobal h264_weight_%1, 6, 6, %2
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WEIGHT_SETUP
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sar r2d, 1
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lea r3, [r1*2]
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.nextrow:
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WEIGHT_OP 0, r1
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movh [r0], m0
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%if mmsize == 16
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movhps [r0+r1], m0
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%else
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psrlq m0, 32
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movh [r0+r1], m0
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%endif
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add r0, r3
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dec r2d
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jnz .nextrow
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RET
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%endmacro
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INIT_MMX mmxext
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WEIGHT_FUNC_HALF_MM 4, 0
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INIT_XMM sse2
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WEIGHT_FUNC_HALF_MM 8, 8
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%macro BIWEIGHT_SETUP 0
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%if ARCH_X86_64
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%define off_regd r7d
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%else
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%define off_regd r3d
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%endif
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mov off_regd, r7m
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add off_regd, 1
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or off_regd, 1
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add r4d, 1
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cmp r6d, 128
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je .nonnormal
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cmp r5d, 128
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jne .normal
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.nonnormal:
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sar r5d, 1
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sar r6d, 1
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sar off_regd, 1
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sub r4d, 1
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.normal:
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%if cpuflag(ssse3)
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movd m4, r5d
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movd m0, r6d
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%else
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movd m3, r5d
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movd m4, r6d
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%endif
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movd m5, off_regd
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movd m6, r4d
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pslld m5, m6
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psrld m5, 1
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%if cpuflag(ssse3)
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punpcklbw m4, m0
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pshuflw m4, m4, 0
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pshuflw m5, m5, 0
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punpcklqdq m4, m4
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punpcklqdq m5, m5
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%else
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%if mmsize == 16
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pshuflw m3, m3, 0
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pshuflw m4, m4, 0
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pshuflw m5, m5, 0
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punpcklqdq m3, m3
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punpcklqdq m4, m4
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punpcklqdq m5, m5
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%else
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pshufw m3, m3, 0
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pshufw m4, m4, 0
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pshufw m5, m5, 0
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%endif
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pxor m7, m7
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%endif
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%endmacro
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%macro BIWEIGHT_STEPA 3
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movh m%1, [r0+%3]
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movh m%2, [r1+%3]
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punpcklbw m%1, m7
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punpcklbw m%2, m7
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pmullw m%1, m3
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pmullw m%2, m4
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paddsw m%1, m%2
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%endmacro
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%macro BIWEIGHT_STEPB 0
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paddsw m0, m5
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paddsw m1, m5
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psraw m0, m6
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psraw m1, m6
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packuswb m0, m1
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%endmacro
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%macro BIWEIGHT_FUNC_MM 2
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cglobal h264_biweight_%1, 7, 8, %2
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BIWEIGHT_SETUP
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movifnidn r3d, r3m
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.nextrow:
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BIWEIGHT_STEPA 0, 1, 0
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BIWEIGHT_STEPA 1, 2, mmsize/2
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BIWEIGHT_STEPB
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mova [r0], m0
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add r0, r2
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add r1, r2
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dec r3d
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jnz .nextrow
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RET
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%endmacro
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INIT_XMM sse2
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BIWEIGHT_FUNC_MM 16, 8
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%macro BIWEIGHT_FUNC_HALF_MM 2
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cglobal h264_biweight_%1, 7, 8, %2
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BIWEIGHT_SETUP
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movifnidn r3d, r3m
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sar r3, 1
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lea r4, [r2*2]
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.nextrow:
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BIWEIGHT_STEPA 0, 1, 0
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BIWEIGHT_STEPA 1, 2, r2
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BIWEIGHT_STEPB
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movh [r0], m0
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%if mmsize == 16
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movhps [r0+r2], m0
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%else
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psrlq m0, 32
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movh [r0+r2], m0
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%endif
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add r0, r4
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add r1, r4
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dec r3d
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jnz .nextrow
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RET
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%endmacro
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INIT_MMX mmxext
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BIWEIGHT_FUNC_HALF_MM 4, 0
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INIT_XMM sse2
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BIWEIGHT_FUNC_HALF_MM 8, 8
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%macro BIWEIGHT_SSSE3_OP 0
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pmaddubsw m0, m4
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pmaddubsw m2, m4
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paddsw m0, m5
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paddsw m2, m5
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psraw m0, m6
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psraw m2, m6
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packuswb m0, m2
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%endmacro
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INIT_XMM ssse3
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cglobal h264_biweight_16, 7, 8, 8
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BIWEIGHT_SETUP
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movifnidn r3d, r3m
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.nextrow:
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movh m0, [r0]
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movh m2, [r0+8]
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movh m3, [r1+8]
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punpcklbw m0, [r1]
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punpcklbw m2, m3
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BIWEIGHT_SSSE3_OP
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mova [r0], m0
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add r0, r2
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add r1, r2
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dec r3d
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jnz .nextrow
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RET
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INIT_XMM ssse3
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cglobal h264_biweight_8, 7, 8, 8
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BIWEIGHT_SETUP
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movifnidn r3d, r3m
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sar r3, 1
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lea r4, [r2*2]
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.nextrow:
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movh m0, [r0]
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movh m1, [r1]
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movh m2, [r0+r2]
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movh m3, [r1+r2]
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punpcklbw m0, m1
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punpcklbw m2, m3
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BIWEIGHT_SSSE3_OP
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movh [r0], m0
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movhps [r0+r2], m0
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add r0, r4
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add r1, r4
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dec r3d
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jnz .nextrow
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RET
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