;
; jquanti.asm - sample data conversion and quantization (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"
%include "jdct.inc"
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 64
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
; DCTELEM *workspace);
;
; r10 = JSAMPARRAY sample_data
; r11 = JDIMENSION start_col
; r12 = DCTELEM *workspace
align 16
global EXTN(jsimd_convsamp_sse2)
EXTN(jsimd_convsamp_sse2):
push rbp
mov rax,rsp
mov rbp,rsp
collect_args
push rbx
pxor xmm6,xmm6 ; xmm6=(all 0's)
pcmpeqw xmm7,xmm7
psllw xmm7,7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
mov rsi, r10
mov eax, r11d
mov rdi, r12
mov rcx, DCTSIZE/4
.convloop:
mov rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm0=(01234567)
movq xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF)
mov rbx, JSAMPROW [rsi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
mov rdx, JSAMPROW [rsi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
movq xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN)
movq xmm3, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE] ; xmm3=(OPQRSTUV)
punpcklbw xmm0,xmm6 ; xmm0=(01234567)
punpcklbw xmm1,xmm6 ; xmm1=(89ABCDEF)
paddw xmm0,xmm7
paddw xmm1,xmm7
punpcklbw xmm2,xmm6 ; xmm2=(GHIJKLMN)
punpcklbw xmm3,xmm6 ; xmm3=(OPQRSTUV)
paddw xmm2,xmm7
paddw xmm3,xmm7
movdqa XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
add rsi, byte 4*SIZEOF_JSAMPROW
add rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
dec rcx
jnz short .convloop
pop rbx
uncollect_args
pop rbp
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_sse2 (JCOEFPTR coef_block, DCTELEM *divisors,
; DCTELEM *workspace);
;
%define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
%define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
%define SCALE(m,n,b) XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
; r10 = JCOEFPTR coef_block
; r11 = DCTELEM *divisors
; r12 = DCTELEM *workspace
align 16
global EXTN(jsimd_quantize_sse2)
EXTN(jsimd_quantize_sse2):
push rbp
mov rax,rsp
mov rbp,rsp
collect_args
mov rsi, r12
mov rdx, r11
mov rdi, r10
mov rax, DCTSIZE2/32
.quantloop:
movdqa xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm7, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_DCTELEM)]
movdqa xmm0,xmm4
movdqa xmm1,xmm5
movdqa xmm2,xmm6
movdqa xmm3,xmm7
psraw xmm4,(WORD_BIT-1)
psraw xmm5,(WORD_BIT-1)
psraw xmm6,(WORD_BIT-1)
psraw xmm7,(WORD_BIT-1)
pxor xmm0,xmm4
pxor xmm1,xmm5
pxor xmm2,xmm6
pxor xmm3,xmm7
psubw xmm0,xmm4 ; if (xmm0 < 0) xmm0 = -xmm0;
psubw xmm1,xmm5 ; if (xmm1 < 0) xmm1 = -xmm1;
psubw xmm2,xmm6 ; if (xmm2 < 0) xmm2 = -xmm2;
psubw xmm3,xmm7 ; if (xmm3 < 0) xmm3 = -xmm3;
paddw xmm0, XMMWORD [CORRECTION(0,0,rdx)] ; correction + roundfactor
paddw xmm1, XMMWORD [CORRECTION(1,0,rdx)]
paddw xmm2, XMMWORD [CORRECTION(2,0,rdx)]
paddw xmm3, XMMWORD [CORRECTION(3,0,rdx)]
pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,rdx)] ; reciprocal
pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
pmulhuw xmm0, XMMWORD [SCALE(0,0,rdx)] ; scale
pmulhuw xmm1, XMMWORD [SCALE(1,0,rdx)]
pmulhuw xmm2, XMMWORD [SCALE(2,0,rdx)]
pmulhuw xmm3, XMMWORD [SCALE(3,0,rdx)]
pxor xmm0,xmm4
pxor xmm1,xmm5
pxor xmm2,xmm6
pxor xmm3,xmm7
psubw xmm0,xmm4
psubw xmm1,xmm5
psubw xmm2,xmm6
psubw xmm3,xmm7
movdqa XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
add rsi, byte 32*SIZEOF_DCTELEM
add rdx, byte 32*SIZEOF_DCTELEM
add rdi, byte 32*SIZEOF_JCOEF
dec rax
jnz near .quantloop
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