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;
; jcsample.asm - downsampling (AVX2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2015, Intel Corporation.
; Copyright (C) 2016, 2024, 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) or Yasm.
%include "jsimdext.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; 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_avx2(JDIMENSION image_width, int max_v_samp_factor,
; JDIMENSION v_samp_factor,
; JDIMENSION width_in_blocks, JSAMPARRAY input_data,
; JSAMPARRAY output_data);
;
%define img_width(b) (b) + 8 ; JDIMENSION image_width
%define max_v_samp(b) (b) + 12 ; int max_v_samp_factor
%define v_samp(b) (b) + 16 ; JDIMENSION v_samp_factor
%define width_blks(b) (b) + 20 ; JDIMENSION width_in_blocks
%define input_data(b) (b) + 24 ; JSAMPARRAY input_data
%define output_data(b) (b) + 28 ; JSAMPARRAY output_data
align 32
GLOBAL_FUNCTION(jsimd_h2v1_downsample_avx2)
EXTN(jsimd_h2v1_downsample_avx2):
push ebp
mov ebp, esp
; push ebx ; unused
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
mov ecx, JDIMENSION [width_blks(ebp)]
shl ecx, 3 ; imul ecx,DCTSIZE (ecx = output_cols)
jz near .return
mov edx, JDIMENSION [img_width(ebp)]
; -- expand_right_edge
push ecx
shl ecx, 1 ; output_cols * 2
sub ecx, edx
jle short .expand_end
mov eax, INT [max_v_samp(ebp)]
test eax, eax
jle short .expand_end
cld
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
ALIGNX 16, 7
.expandloop:
push eax
push ecx
mov edi, JSAMPROW [esi]
add edi, edx
mov al, JSAMPLE [edi-1]
rep stosb
pop ecx
pop eax
add esi, byte SIZEOF_JSAMPROW
dec eax
jg short .expandloop
.expand_end:
pop ecx ; output_cols
; -- h2v1_downsample
mov eax, JDIMENSION [v_samp(ebp)] ; rowctr
test eax, eax
jle near .return
mov edx, 0x00010000 ; bias pattern
vmovd xmm7, edx
vpshufd xmm7, xmm7, 0x00 ; xmm7={0, 1, 0, 1, 0, 1, 0, 1}
vperm2i128 ymm7, ymm7, ymm7, 0 ; ymm7={xmm7, xmm7}
vpcmpeqw ymm6, ymm6, ymm6
vpsrlw ymm6, ymm6, BYTE_BIT ; ymm6={0xFF 0x00 0xFF 0x00 ..}
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
mov edi, JSAMPARRAY [output_data(ebp)] ; output_data
ALIGNX 16, 7
.rowloop:
push ecx
push edi
push esi
mov esi, JSAMPROW [esi] ; inptr
mov edi, JSAMPROW [edi] ; outptr
cmp ecx, byte SIZEOF_YMMWORD
jae short .columnloop
ALIGNX 16, 7
.columnloop_r24:
; ecx can possibly be 8, 16, 24
cmp ecx, 24
jne .columnloop_r16
vmovdqu ymm0, YMMWORD [esi+0*SIZEOF_YMMWORD]
vmovdqu xmm1, XMMWORD [esi+1*SIZEOF_YMMWORD]
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
.columnloop_r16:
cmp ecx, 16
jne .columnloop_r8
vmovdqu ymm0, YMMWORD [esi+0*SIZEOF_YMMWORD]
vpxor ymm1, ymm1, ymm1
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
.columnloop_r8:
vmovdqu xmm0, XMMWORD[esi+0*SIZEOF_YMMWORD]
vpxor ymm1, ymm1, ymm1
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
ALIGNX 16, 7
.columnloop:
vmovdqu ymm0, YMMWORD [esi+0*SIZEOF_YMMWORD]
vmovdqu ymm1, YMMWORD [esi+1*SIZEOF_YMMWORD]
.downsample:
vpsrlw ymm2, ymm0, BYTE_BIT
vpand ymm0, ymm0, ymm6
vpsrlw ymm3, ymm1, BYTE_BIT
vpand ymm1, ymm1, ymm6
vpaddw ymm0, ymm0, ymm2
vpaddw ymm1, ymm1, ymm3
vpaddw ymm0, ymm0, ymm7
vpaddw ymm1, ymm1, ymm7
vpsrlw ymm0, ymm0, 1
vpsrlw ymm1, ymm1, 1
vpackuswb ymm0, ymm0, ymm1
vpermq ymm0, ymm0, 0xd8
vmovdqu YMMWORD [edi+0*SIZEOF_YMMWORD], ymm0
sub ecx, byte SIZEOF_YMMWORD ; outcol
add esi, byte 2*SIZEOF_YMMWORD ; inptr
add edi, byte 1*SIZEOF_YMMWORD ; outptr
cmp ecx, byte SIZEOF_YMMWORD
jae short .columnloop
test ecx, ecx
jnz near .columnloop_r24
pop esi
pop edi
pop ecx
add esi, byte SIZEOF_JSAMPROW ; input_data
add edi, byte SIZEOF_JSAMPROW ; output_data
dec eax ; rowctr
jg near .rowloop
.return:
vzeroupper
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
; pop ebx ; unused
pop ebp
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_avx2(JDIMENSION image_width, int max_v_samp_factor,
; JDIMENSION v_samp_factor,
; JDIMENSION width_in_blocks, JSAMPARRAY input_data,
; JSAMPARRAY output_data);
;
%define img_width(b) (b) + 8 ; JDIMENSION image_width
%define max_v_samp(b) (b) + 12 ; int max_v_samp_factor
%define v_samp(b) (b) + 16 ; JDIMENSION v_samp_factor
%define width_blks(b) (b) + 20 ; JDIMENSION width_in_blocks
%define input_data(b) (b) + 24 ; JSAMPARRAY input_data
%define output_data(b) (b) + 28 ; JSAMPARRAY output_data
align 32
GLOBAL_FUNCTION(jsimd_h2v2_downsample_avx2)
EXTN(jsimd_h2v2_downsample_avx2):
push ebp
mov ebp, esp
; push ebx ; unused
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
mov ecx, JDIMENSION [width_blks(ebp)]
shl ecx, 3 ; imul ecx,DCTSIZE (ecx = output_cols)
jz near .return
mov edx, JDIMENSION [img_width(ebp)]
; -- expand_right_edge
push ecx
shl ecx, 1 ; output_cols * 2
sub ecx, edx
jle short .expand_end
mov eax, INT [max_v_samp(ebp)]
test eax, eax
jle short .expand_end
cld
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
ALIGNX 16, 7
.expandloop:
push eax
push ecx
mov edi, JSAMPROW [esi]
add edi, edx
mov al, JSAMPLE [edi-1]
rep stosb
pop ecx
pop eax
add esi, byte SIZEOF_JSAMPROW
dec eax
jg short .expandloop
.expand_end:
pop ecx ; output_cols
; -- h2v2_downsample
mov eax, JDIMENSION [v_samp(ebp)] ; rowctr
test eax, eax
jle near .return
mov edx, 0x00020001 ; bias pattern
vmovd xmm7, edx
vpcmpeqw ymm6, ymm6, ymm6
vpshufd xmm7, xmm7, 0x00 ; ymm7={1, 2, 1, 2, 1, 2, 1, 2}
vperm2i128 ymm7, ymm7, ymm7, 0
vpsrlw ymm6, ymm6, BYTE_BIT ; ymm6={0xFF 0x00 0xFF 0x00 ..}
mov esi, JSAMPARRAY [input_data(ebp)] ; input_data
mov edi, JSAMPARRAY [output_data(ebp)] ; output_data
ALIGNX 16, 7
.rowloop:
push ecx
push edi
push esi
mov edx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; inptr0
mov esi, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; inptr1
mov edi, JSAMPROW [edi] ; outptr
cmp ecx, byte SIZEOF_YMMWORD
jae short .columnloop
ALIGNX 16, 7
.columnloop_r24:
cmp ecx, 24
jne .columnloop_r16
vmovdqu ymm0, YMMWORD [edx+0*SIZEOF_YMMWORD]
vmovdqu ymm1, YMMWORD [esi+0*SIZEOF_YMMWORD]
vmovdqu xmm2, XMMWORD [edx+1*SIZEOF_YMMWORD]
vmovdqu xmm3, XMMWORD [esi+1*SIZEOF_YMMWORD]
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
.columnloop_r16:
cmp ecx, 16
jne .columnloop_r8
vmovdqu ymm0, YMMWORD [edx+0*SIZEOF_YMMWORD]
vmovdqu ymm1, YMMWORD [esi+0*SIZEOF_YMMWORD]
vpxor ymm2, ymm2, ymm2
vpxor ymm3, ymm3, ymm3
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
.columnloop_r8:
vmovdqu xmm0, XMMWORD [edx+0*SIZEOF_XMMWORD]
vmovdqu xmm1, XMMWORD [esi+0*SIZEOF_XMMWORD]
vpxor ymm2, ymm2, ymm2
vpxor ymm3, ymm3, ymm3
mov ecx, SIZEOF_YMMWORD
jmp short .downsample
ALIGNX 16, 7
.columnloop:
vmovdqu ymm0, YMMWORD [edx+0*SIZEOF_YMMWORD]
vmovdqu ymm1, YMMWORD [esi+0*SIZEOF_YMMWORD]
vmovdqu ymm2, YMMWORD [edx+1*SIZEOF_YMMWORD]
vmovdqu ymm3, YMMWORD [esi+1*SIZEOF_YMMWORD]
.downsample:
vpand ymm4, ymm0, ymm6
vpsrlw ymm0, ymm0, BYTE_BIT
vpand ymm5, ymm1, ymm6
vpsrlw ymm1, ymm1, BYTE_BIT
vpaddw ymm0, ymm0, ymm4
vpaddw ymm1, ymm1, ymm5
vpand ymm4, ymm2, ymm6
vpsrlw ymm2, ymm2, BYTE_BIT
vpand ymm5, ymm3, ymm6
vpsrlw ymm3, ymm3, BYTE_BIT
vpaddw ymm2, ymm2, ymm4
vpaddw ymm3, ymm3, ymm5
vpaddw ymm0, ymm0, ymm1
vpaddw ymm2, ymm2, ymm3
vpaddw ymm0, ymm0, ymm7
vpaddw ymm2, ymm2, ymm7
vpsrlw ymm0, ymm0, 2
vpsrlw ymm2, ymm2, 2
vpackuswb ymm0, ymm0, ymm2
vpermq ymm0, ymm0, 0xd8
vmovdqu YMMWORD [edi+0*SIZEOF_YMMWORD], ymm0
sub ecx, byte SIZEOF_YMMWORD ; outcol
add edx, byte 2*SIZEOF_YMMWORD ; inptr0
add esi, byte 2*SIZEOF_YMMWORD ; inptr1
add edi, byte 1*SIZEOF_YMMWORD ; outptr
cmp ecx, byte SIZEOF_YMMWORD
jae near .columnloop
test ecx, ecx
jnz near .columnloop_r24
pop esi
pop edi
pop ecx
add esi, byte 2*SIZEOF_JSAMPROW ; input_data
add edi, byte 1*SIZEOF_JSAMPROW ; output_data
dec eax ; rowctr
jg near .rowloop
.return:
vzeroupper
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
; pop ebx ; unused
pop ebp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 32