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;
; jquantf.asm - sample data conversion and quantization (64-bit SSE & SSE2)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
; Copyright (C) 2009, 2016, D. R. Commander.
; Copyright (C) 2018, Matthias Räncker.
;
; 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 64
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_float_sse2(JSAMPARRAY sample_data, JDIMENSION start_col,
; FAST_FLOAT *workspace);
;
; r10 = JSAMPARRAY sample_data
; r11d = JDIMENSION start_col
; r12 = FAST_FLOAT *workspace
align 32
GLOBAL_FUNCTION(jsimd_convsamp_float_sse2)
EXTN(jsimd_convsamp_float_sse2):
push rbp
mov rax, rsp
mov rbp, rsp
collect_args 3
push rbx
pcmpeqw xmm7, xmm7
psllw xmm7, 7
packsswb xmm7, xmm7 ; xmm7 = PB_CENTERJSAMPLE (0x808080..)
mov rsi, r10
mov eax, r11d
mov rdi, r12
mov rcx, DCTSIZE/2
.convloop:
mov rbxp, JSAMPROW [rsi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov rdxp, JSAMPROW [rsi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE]
movq xmm1, XMM_MMWORD [rdx+rax*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,rdi,SIZEOF_FAST_FLOAT)], xmm2
movaps XMMWORD [XMMBLOCK(0,1,rdi,SIZEOF_FAST_FLOAT)], xmm0
movaps XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_FAST_FLOAT)], xmm3
movaps XMMWORD [XMMBLOCK(1,1,rdi,SIZEOF_FAST_FLOAT)], xmm1
add rsi, byte 2*SIZEOF_JSAMPROW
add rdi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
dec rcx
jnz short .convloop
pop rbx
uncollect_args 3
pop rbp
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);
;
; r10 = JCOEFPTR coef_block
; r11 = FAST_FLOAT *divisors
; r12 = FAST_FLOAT *workspace
align 32
GLOBAL_FUNCTION(jsimd_quantize_float_sse2)
EXTN(jsimd_quantize_float_sse2):
push rbp
mov rax, rsp
mov rbp, rsp
collect_args 3
mov rsi, r12
mov rdx, r11
mov rdi, r10
mov rax, DCTSIZE2/16
.quantloop:
movaps xmm0, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_FAST_FLOAT)]
movaps xmm1, XMMWORD [XMMBLOCK(0,1,rsi,SIZEOF_FAST_FLOAT)]
mulps xmm0, XMMWORD [XMMBLOCK(0,0,rdx,SIZEOF_FAST_FLOAT)]
mulps xmm1, XMMWORD [XMMBLOCK(0,1,rdx,SIZEOF_FAST_FLOAT)]
movaps xmm2, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_FAST_FLOAT)]
movaps xmm3, XMMWORD [XMMBLOCK(1,1,rsi,SIZEOF_FAST_FLOAT)]
mulps xmm2, XMMWORD [XMMBLOCK(1,0,rdx,SIZEOF_FAST_FLOAT)]
mulps xmm3, XMMWORD [XMMBLOCK(1,1,rdx,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,rdi,SIZEOF_JCOEF)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_JCOEF)], xmm2
add rsi, byte 16*SIZEOF_FAST_FLOAT
add rdx, byte 16*SIZEOF_FAST_FLOAT
add rdi, byte 16*SIZEOF_JCOEF
dec rax
jnz short .quantloop
uncollect_args 3
pop rbp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 32
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