ref: c8f5a55df4267a1fd5fd7d47002ffe2dcb02702e
dir: /vpx_dsp/x86/add_noise_sse2.asm/
; ; Copyright (c) 2010 The WebM project authors. All Rights Reserved. ; ; Use of this source code is governed by a BSD-style license ; that can be found in the LICENSE file in the root of the source ; tree. An additional intellectual property rights grant can be found ; in the file PATENTS. All contributing project authors may ; be found in the AUTHORS file in the root of the source tree. ; %include "vpx_ports/x86_abi_support.asm" ;void vpx_plane_add_noise_sse2(uint8_t *start, const int8_t *noise, ; int blackclamp, int whiteclamp, ; int width, int height, int pitch) global sym(vpx_plane_add_noise_sse2) PRIVATE sym(vpx_plane_add_noise_sse2): push rbp mov rbp, rsp SHADOW_ARGS_TO_STACK 7 GET_GOT rbx push rsi push rdi mov rdx, 0x01010101 mov rax, arg(2) mul rdx movd xmm3, rax pshufd xmm3, xmm3, 0 ; xmm3 is 16 copies of char in blackclamp mov rdx, 0x01010101 mov rax, arg(3) mul rdx movd xmm4, rax pshufd xmm4, xmm4, 0 ; xmm4 is 16 copies of char in whiteclamp movdqu xmm5, xmm3 ; both clamp = black clamp + white clamp paddusb xmm5, xmm4 .addnoise_loop: call sym(LIBVPX_RAND) WRT_PLT mov rcx, arg(1) ;noise and rax, 0xff add rcx, rax mov rdi, rcx movsxd rcx, dword arg(4) ;[Width] mov rsi, arg(0) ;Pos xor rax, rax .addnoise_nextset: movdqu xmm1,[rsi+rax] ; get the source psubusb xmm1, xmm3 ; subtract black clamp paddusb xmm1, xmm5 ; add both clamp psubusb xmm1, xmm4 ; subtract whiteclamp movdqu xmm2,[rdi+rax] ; get the noise for this line paddb xmm1,xmm2 ; add it in movdqu [rsi+rax],xmm1 ; store the result add rax,16 ; move to the next line cmp rax, rcx jl .addnoise_nextset movsxd rax, dword arg(6) ; Pitch add arg(0), rax ; Start += Pitch sub dword arg(5), 1 ; Height -= 1 jg .addnoise_loop ; begin epilog pop rdi pop rsi RESTORE_GOT UNSHADOW_ARGS pop rbp ret SECTION_RODATA align 16 rd42: times 8 dw 0x04 four8s: times 4 dd 8