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mozjpeg/simd/jcsample-sse2-64.asm
DRC 123f7258a8 Format copyright headers more consistently 
The IJG convention is to format copyright notices as:

Copyright (C) YYYY, Owner.

We try to maintain this convention for any code that is part of the
libjpeg API library (with the exception of preserving the copyright
notices from Cendio's code verbatim, since those predate
libjpeg-turbo.)

Note that the phrase "All Rights Reserved" is no longer necessary, since
all Buenos Aires Convention signatories signed onto the Berne Convention
in 2000.  However, our convention is to retain this phrase for any files
that have a self-contained copyright header but to leave it off of any
files that refer to another file for conditions of distribution and use.
For instance, all of the non-SIMD files in the libjpeg API library refer
to README.ijg, and the copyright message in that file contains "All
Rights Reserved", so it is unnecessary to add it to the individual
files.

The TurboJPEG code retains my preferred formatting convention for
copyright notices, which is based on that of VirtualGL (where the
TurboJPEG API originated.)
2016-05-28 19:16:58 -05:00

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;
; jcsample.asm - downsampling (64-bit SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2009, D. R. Commander.
;
; Based on the x86 SIMD extension for IJG JPEG library
; Copyright (C) 1999-2006, MIYASAKA Masaru.
; For conditions of distribution and use, see copyright notice in jsimdext.inc
;
; This file should be assembled with NASM (Netwide Assembler),
; can *not* be assembled with Microsoft's MASM or any compatible
; assembler (including Borland's Turbo Assembler).
; NASM is available from http://nasm.sourceforge.net/ or
; http://sourceforge.net/project/showfiles.php?group_id=6208
;
; [TAB8]
%include "jsimdext.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 64
;
; Downsample pixel values of a single component.
; This version handles the common case of 2:1 horizontal and 1:1 vertical,
; without smoothing.
;
; GLOBAL(void)
; jsimd_h2v1_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
; JDIMENSION v_samp_factor, JDIMENSION width_blocks,
; JSAMPARRAY input_data, JSAMPARRAY output_data);
;
; r10 = JDIMENSION image_width
; r11 = int max_v_samp_factor
; r12 = JDIMENSION v_samp_factor
; r13 = JDIMENSION width_blocks
; r14 = JSAMPARRAY input_data
; r15 = JSAMPARRAY output_data
align 16
global EXTN(jsimd_h2v1_downsample_sse2)
EXTN(jsimd_h2v1_downsample_sse2):
push rbp
mov rax,rsp
mov rbp,rsp
collect_args
mov ecx, r13d
shl rcx,3 ; imul rcx,DCTSIZE (rcx = output_cols)
jz near .return
mov edx, r10d
; -- expand_right_edge
push rcx
shl rcx,1 ; output_cols * 2
sub rcx,rdx
jle short .expand_end
mov rax, r11
test rax,rax
jle short .expand_end
cld
mov rsi, r14 ; input_data
.expandloop:
push rax
push rcx
mov rdi, JSAMPROW [rsi]
add rdi,rdx
mov al, JSAMPLE [rdi-1]
rep stosb
pop rcx
pop rax
add rsi, byte SIZEOF_JSAMPROW
dec rax
jg short .expandloop
.expand_end:
pop rcx ; output_cols
; -- h2v1_downsample
mov eax, r12d ; rowctr
test eax,eax
jle near .return
mov rdx, 0x00010000 ; bias pattern
movd xmm7,edx
pcmpeqw xmm6,xmm6
pshufd xmm7,xmm7,0x00 ; xmm7={0, 1, 0, 1, 0, 1, 0, 1}
psrlw xmm6,BYTE_BIT ; xmm6={0xFF 0x00 0xFF 0x00 ..}
mov rsi, r14 ; input_data
mov rdi, r15 ; output_data
.rowloop:
push rcx
push rdi
push rsi
mov rsi, JSAMPROW [rsi] ; inptr
mov rdi, JSAMPROW [rdi] ; outptr
cmp rcx, byte SIZEOF_XMMWORD
jae short .columnloop
.columnloop_r8:
movdqa xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
pxor xmm1,xmm1
mov rcx, SIZEOF_XMMWORD
jmp short .downsample
.columnloop:
movdqa xmm0, XMMWORD [rsi+0*SIZEOF_XMMWORD]
movdqa xmm1, XMMWORD [rsi+1*SIZEOF_XMMWORD]
.downsample:
movdqa xmm2,xmm0
movdqa xmm3,xmm1
pand xmm0,xmm6
psrlw xmm2,BYTE_BIT
pand xmm1,xmm6
psrlw xmm3,BYTE_BIT
paddw xmm0,xmm2
paddw xmm1,xmm3
paddw xmm0,xmm7
paddw xmm1,xmm7
psrlw xmm0,1
psrlw xmm1,1
packuswb xmm0,xmm1
movdqa XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
sub rcx, byte SIZEOF_XMMWORD ; outcol
add rsi, byte 2*SIZEOF_XMMWORD ; inptr
add rdi, byte 1*SIZEOF_XMMWORD ; outptr
cmp rcx, byte SIZEOF_XMMWORD
jae short .columnloop
test rcx,rcx
jnz short .columnloop_r8
pop rsi
pop rdi
pop rcx
add rsi, byte SIZEOF_JSAMPROW ; input_data
add rdi, byte SIZEOF_JSAMPROW ; output_data
dec rax ; rowctr
jg near .rowloop
.return:
uncollect_args
pop rbp
ret
; --------------------------------------------------------------------------
;
; Downsample pixel values of a single component.
; This version handles the standard case of 2:1 horizontal and 2:1 vertical,
; without smoothing.
;
; GLOBAL(void)
; jsimd_h2v2_downsample_sse2 (JDIMENSION image_width, int max_v_samp_factor,
; JDIMENSION v_samp_factor, JDIMENSION width_blocks,
; JSAMPARRAY input_data, JSAMPARRAY output_data);
;
; r10 = JDIMENSION image_width
; r11 = int max_v_samp_factor
; r12 = JDIMENSION v_samp_factor
; r13 = JDIMENSION width_blocks
; r14 = JSAMPARRAY input_data
; r15 = JSAMPARRAY output_data
align 16
global EXTN(jsimd_h2v2_downsample_sse2)
EXTN(jsimd_h2v2_downsample_sse2):
push rbp
mov rax,rsp
mov rbp,rsp
collect_args
mov ecx, r13d
shl rcx,3 ; imul rcx,DCTSIZE (rcx = output_cols)
jz near .return
mov edx, r10d
; -- expand_right_edge
push rcx
shl rcx,1 ; output_cols * 2
sub rcx,rdx
jle short .expand_end
mov rax, r11
test rax,rax
jle short .expand_end
cld
mov rsi, r14 ; input_data
.expandloop:
push rax
push rcx
mov rdi, JSAMPROW [rsi]
add rdi,rdx
mov al, JSAMPLE [rdi-1]
rep stosb
pop rcx
pop rax
add rsi, byte SIZEOF_JSAMPROW
dec rax
jg short .expandloop
.expand_end:
pop rcx ; output_cols
; -- h2v2_downsample
mov eax, r12d ; rowctr
test rax,rax
jle near .return
mov rdx, 0x00020001 ; bias pattern
movd xmm7,edx
pcmpeqw xmm6,xmm6
pshufd xmm7,xmm7,0x00 ; xmm7={1, 2, 1, 2, 1, 2, 1, 2}
psrlw xmm6,BYTE_BIT ; xmm6={0xFF 0x00 0xFF 0x00 ..}
mov rsi, r14 ; input_data
mov rdi, r15 ; output_data
.rowloop:
push rcx
push rdi
push rsi
mov rdx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW] ; inptr0
mov rsi, JSAMPROW [rsi+1*SIZEOF_JSAMPROW] ; inptr1
mov rdi, JSAMPROW [rdi] ; outptr
cmp rcx, byte SIZEOF_XMMWORD
jae short .columnloop
.columnloop_r8:
movdqa xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
movdqa xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
pxor xmm2,xmm2
pxor xmm3,xmm3
mov rcx, SIZEOF_XMMWORD
jmp short .downsample
.columnloop:
movdqa xmm0, XMMWORD [rdx+0*SIZEOF_XMMWORD]
movdqa xmm1, XMMWORD [rsi+0*SIZEOF_XMMWORD]
movdqa xmm2, XMMWORD [rdx+1*SIZEOF_XMMWORD]
movdqa xmm3, XMMWORD [rsi+1*SIZEOF_XMMWORD]
.downsample:
movdqa xmm4,xmm0
movdqa xmm5,xmm1
pand xmm0,xmm6
psrlw xmm4,BYTE_BIT
pand xmm1,xmm6
psrlw xmm5,BYTE_BIT
paddw xmm0,xmm4
paddw xmm1,xmm5
movdqa xmm4,xmm2
movdqa xmm5,xmm3
pand xmm2,xmm6
psrlw xmm4,BYTE_BIT
pand xmm3,xmm6
psrlw xmm5,BYTE_BIT
paddw xmm2,xmm4
paddw xmm3,xmm5
paddw xmm0,xmm1
paddw xmm2,xmm3
paddw xmm0,xmm7
paddw xmm2,xmm7
psrlw xmm0,2
psrlw xmm2,2
packuswb xmm0,xmm2
movdqa XMMWORD [rdi+0*SIZEOF_XMMWORD], xmm0
sub rcx, byte SIZEOF_XMMWORD ; outcol
add rdx, byte 2*SIZEOF_XMMWORD ; inptr0
add rsi, byte 2*SIZEOF_XMMWORD ; inptr1
add rdi, byte 1*SIZEOF_XMMWORD ; outptr
cmp rcx, byte SIZEOF_XMMWORD
jae near .columnloop
test rcx,rcx
jnz near .columnloop_r8
pop rsi
pop rdi
pop rcx
add rsi, byte 2*SIZEOF_JSAMPROW ; input_data
add rdi, byte 1*SIZEOF_JSAMPROW ; output_data
dec rax ; rowctr
jg near .rowloop
.return:
uncollect_args
pop rbp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 16
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