;
; jquanti.asm - sample data conversion and quantization (AVX2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2016, 2018, D. R. Commander.
; Copyright (C) 2016, Matthieu Darbois.
;
; 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
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_avx2(JSAMPARRAY sample_data, JDIMENSION start_col,
; DCTELEM *workspace);
;
%define sample_data ebp + 8 ; JSAMPARRAY sample_data
%define start_col ebp + 12 ; JDIMENSION start_col
%define workspace ebp + 16 ; DCTELEM *workspace
align 32
GLOBAL_FUNCTION(jsimd_convsamp_avx2)
EXTN(jsimd_convsamp_avx2):
push ebp
mov ebp, esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *)
mov eax, JDIMENSION [start_col]
mov edi, POINTER [workspace] ; (DCTELEM *)
mov ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm0, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE]
movq xmm1, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE]
mov ebx, JSAMPROW [esi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov edx, JSAMPROW [esi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm2, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE]
movq xmm3, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE]
mov ebx, JSAMPROW [esi+4*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov edx, JSAMPROW [esi+5*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm4, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE]
movq xmm5, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE]
mov ebx, JSAMPROW [esi+6*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov edx, JSAMPROW [esi+7*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm6, XMM_MMWORD [ebx+eax*SIZEOF_JSAMPLE]
movq xmm7, XMM_MMWORD [edx+eax*SIZEOF_JSAMPLE]
vinserti128 ymm0, ymm0, xmm1, 1
vinserti128 ymm2, ymm2, xmm3, 1
vinserti128 ymm4, ymm4, xmm5, 1
vinserti128 ymm6, ymm6, xmm7, 1
vpxor ymm1, ymm1, ymm1 ; ymm1=(all 0's)
vpunpcklbw ymm0, ymm0, ymm1
vpunpcklbw ymm2, ymm2, ymm1
vpunpcklbw ymm4, ymm4, ymm1
vpunpcklbw ymm6, ymm6, ymm1
vpcmpeqw ymm7, ymm7, ymm7
vpsllw ymm7, ymm7, 7 ; ymm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
vpaddw ymm0, ymm0, ymm7
vpaddw ymm2, ymm2, ymm7
vpaddw ymm4, ymm4, ymm7
vpaddw ymm6, ymm6, ymm7
vmovdqu YMMWORD [YMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], ymm0
vmovdqu YMMWORD [YMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], ymm2
vmovdqu YMMWORD [YMMBLOCK(4,0,edi,SIZEOF_DCTELEM)], ymm4
vmovdqu YMMWORD [YMMBLOCK(6,0,edi,SIZEOF_DCTELEM)], ymm6
vzeroupper
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
pop ebp
ret
; --------------------------------------------------------------------------
;
; Quantize/descale the coefficients, and store into coef_block
;
; This implementation is based on an algorithm described in
; "How to optimize for the Pentium family of microprocessors"
; (http://www.agner.org/assem/).
;
; GLOBAL(void)
; jsimd_quantize_avx2(JCOEFPTR coef_block, DCTELEM *divisors,
; DCTELEM *workspace);
;
%define RECIPROCAL(m, n, b) \
YMMBLOCK(DCTSIZE * 0 + (m), (n), (b), SIZEOF_DCTELEM)
%define CORRECTION(m, n, b) \
YMMBLOCK(DCTSIZE * 1 + (m), (n), (b), SIZEOF_DCTELEM)
%define SCALE(m, n, b) \
YMMBLOCK(DCTSIZE * 2 + (m), (n), (b), SIZEOF_DCTELEM)
%define coef_block ebp + 8 ; JCOEFPTR coef_block
%define divisors ebp + 12 ; DCTELEM *divisors
%define workspace ebp + 16 ; DCTELEM *workspace
align 32
GLOBAL_FUNCTION(jsimd_quantize_avx2)
EXTN(jsimd_quantize_avx2):
push ebp
mov ebp, esp
; push ebx ; unused
; push ecx ; unused
; push edx ; need not be preserved
push esi
push edi
mov esi, POINTER [workspace]
mov edx, POINTER [divisors]
mov edi, JCOEFPTR [coef_block]
vmovdqu ymm4, [YMMBLOCK(0,0,esi,SIZEOF_DCTELEM)]
vmovdqu ymm5, [YMMBLOCK(2,0,esi,SIZEOF_DCTELEM)]
vmovdqu ymm6, [YMMBLOCK(4,0,esi,SIZEOF_DCTELEM)]
vmovdqu ymm7, [YMMBLOCK(6,0,esi,SIZEOF_DCTELEM)]
vpabsw ymm0, ymm4
vpabsw ymm1, ymm5
vpabsw ymm2, ymm6
vpabsw ymm3, ymm7
vpaddw ymm0, YMMWORD [CORRECTION(0,0,edx)] ; correction + roundfactor
vpaddw ymm1, YMMWORD [CORRECTION(2,0,edx)]
vpaddw ymm2, YMMWORD [CORRECTION(4,0,edx)]
vpaddw ymm3, YMMWORD [CORRECTION(6,0,edx)]
vpmulhuw ymm0, YMMWORD [RECIPROCAL(0,0,edx)] ; reciprocal
vpmulhuw ymm1, YMMWORD [RECIPROCAL(2,0,edx)]
vpmulhuw ymm2, YMMWORD [RECIPROCAL(4,0,edx)]
vpmulhuw ymm3, YMMWORD [RECIPROCAL(6,0,edx)]
vpmulhuw ymm0, YMMWORD [SCALE(0,0,edx)] ; scale
vpmulhuw ymm1, YMMWORD [SCALE(2,0,edx)]
vpmulhuw ymm2, YMMWORD [SCALE(4,0,edx)]
vpmulhuw ymm3, YMMWORD [SCALE(6,0,edx)]
vpsignw ymm0, ymm0, ymm4
vpsignw ymm1, ymm1, ymm5
vpsignw ymm2, ymm2, ymm6
vpsignw ymm3, ymm3, ymm7
vmovdqu [YMMBLOCK(0,0,edi,SIZEOF_DCTELEM)], ymm0
vmovdqu [YMMBLOCK(2,0,edi,SIZEOF_DCTELEM)], ymm1
vmovdqu [YMMBLOCK(4,0,edi,SIZEOF_DCTELEM)], ymm2
vmovdqu [YMMBLOCK(6,0,edi,SIZEOF_DCTELEM)], ymm3
vzeroupper
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; unused
; 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