ref: 7a5596fa78ad41c428c2e3a4196d3b391d4ac77c
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"
SECTION .text
;void vpx_plane_add_noise_sse2(uint8_t *start, const int8_t *noise,
; int blackclamp, int whiteclamp,
; int width, int height, int pitch)
globalsym(vpx_plane_add_noise_sse2)
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
movq xmm3, rax
pshufd xmm3, xmm3, 0 ; xmm3 is 16 copies of char in blackclamp
mov rdx, 0x01010101
mov rax, arg(3)
mul rdx
movq 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