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;
; jquantf.asm - sample data conversion and quantization (SSE & SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; 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"
%include "jdct.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_float_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
; FAST_FLOAT *workspace);
;
%define sample_data ebp + 8 ; JSAMPARRAY sample_data
%define start_col ebp + 12 ; JDIMENSION start_col
%define workspace ebp + 16 ; FAST_FLOAT *workspace
align 32
GLOBAL_FUNCTION(jsimd_convsamp_float_sse2)
EXTN(jsimd_convsamp_float_sse2):
push ebp
mov ebp, esp
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
pcmpeqw xmm7, xmm7
psllw xmm7, 7
packsswb xmm7, xmm7 ; xmm7 = PB_CENTERJSAMPLE (0x808080..)
mov esi, JSAMPARRAY [sample_data] ; (JSAMPROW *)
mov eax, JDIMENSION [start_col]
mov edi, POINTER [workspace] ; (DCTELEM *)
mov ecx, DCTSIZE/2
ALIGNX 16, 7
.convloop:
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]
psubb xmm0, xmm7 ; xmm0=(01234567)
psubb xmm1, xmm7 ; xmm1=(89ABCDEF)
punpcklbw xmm0, xmm0 ; xmm0=(*0*1*2*3*4*5*6*7)
punpcklbw xmm1, xmm1 ; xmm1=(*8*9*A*B*C*D*E*F)
punpcklwd xmm2, xmm0 ; xmm2=(***0***1***2***3)
punpckhwd xmm0, xmm0 ; xmm0=(***4***5***6***7)
punpcklwd xmm3, xmm1 ; xmm3=(***8***9***A***B)
punpckhwd xmm1, xmm1 ; xmm1=(***C***D***E***F)
psrad xmm2, (DWORD_BIT-BYTE_BIT) ; xmm2=(0123)
psrad xmm0, (DWORD_BIT-BYTE_BIT) ; xmm0=(4567)
cvtdq2ps xmm2, xmm2 ; xmm2=(0123)
cvtdq2ps xmm0, xmm0 ; xmm0=(4567)
psrad xmm3, (DWORD_BIT-BYTE_BIT) ; xmm3=(89AB)
psrad xmm1, (DWORD_BIT-BYTE_BIT) ; xmm1=(CDEF)
cvtdq2ps xmm3, xmm3 ; xmm3=(89AB)
cvtdq2ps xmm1, xmm1 ; xmm1=(CDEF)
movaps XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], xmm2
movaps XMMWORD [XMMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], xmm0
movaps XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], xmm3
movaps XMMWORD [XMMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], xmm1
add esi, byte 2*SIZEOF_JSAMPROW
add edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
dec ecx
jnz short .convloop
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
;
; GLOBAL(void)
; jsimd_quantize_float_sse2(JCOEFPTR coef_block, FAST_FLOAT *divisors,
; FAST_FLOAT *workspace);
;
%define coef_block ebp + 8 ; JCOEFPTR coef_block
%define divisors ebp + 12 ; FAST_FLOAT *divisors
%define workspace ebp + 16 ; FAST_FLOAT *workspace
align 32
GLOBAL_FUNCTION(jsimd_quantize_float_sse2)
EXTN(jsimd_quantize_float_sse2):
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]
mov eax, DCTSIZE2/16
ALIGNX 16, 7
.quantloop:
movaps xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)]
movaps xmm1, XMMWORD [XMMBLOCK(0,1,esi,SIZEOF_FAST_FLOAT)]
mulps xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_FAST_FLOAT)]
mulps xmm1, XMMWORD [XMMBLOCK(0,1,edx,SIZEOF_FAST_FLOAT)]
movaps xmm2, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)]
movaps xmm3, XMMWORD [XMMBLOCK(1,1,esi,SIZEOF_FAST_FLOAT)]
mulps xmm2, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_FAST_FLOAT)]
mulps xmm3, XMMWORD [XMMBLOCK(1,1,edx,SIZEOF_FAST_FLOAT)]
cvtps2dq xmm0, xmm0
cvtps2dq xmm1, xmm1
cvtps2dq xmm2, xmm2
cvtps2dq xmm3, xmm3
packssdw xmm0, xmm1
packssdw xmm2, xmm3
movdqa XMMWORD [XMMBLOCK(0,0,edi,SIZEOF_JCOEF)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,edi,SIZEOF_JCOEF)], xmm2
add esi, byte 16*SIZEOF_FAST_FLOAT
add edx, byte 16*SIZEOF_FAST_FLOAT
add edi, byte 16*SIZEOF_JCOEF
dec eax
jnz short .quantloop
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