;
; 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