mirror of
https://bitbucket.org/CPMADevs/cnq3
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187 lines
6.3 KiB
NASM
187 lines
6.3 KiB
NASM
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; jquanti.asm - sample data conversion and quantization (64-bit SSE2)
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;
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; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
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; Copyright (C) 2009, D. R. Commander.
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;
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; Based on the x86 SIMD extension for IJG JPEG library
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; Copyright (C) 1999-2006, MIYASAKA Masaru.
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; For conditions of distribution and use, see copyright notice in jsimdext.inc
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;
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; This file should be assembled with NASM (Netwide Assembler),
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; can *not* be assembled with Microsoft's MASM or any compatible
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; assembler (including Borland's Turbo Assembler).
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; NASM is available from http://nasm.sourceforge.net/ or
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; http://sourceforge.net/project/showfiles.php?group_id=6208
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;
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; [TAB8]
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%include "jsimdext.inc"
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%include "jdct.inc"
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; --------------------------------------------------------------------------
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SECTION SEG_TEXT
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BITS 64
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;
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; Load data into workspace, applying unsigned->signed conversion
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;
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; GLOBAL(void)
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; jsimd_convsamp_sse2 (JSAMPARRAY sample_data, JDIMENSION start_col,
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; DCTELEM *workspace);
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;
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; r10 = JSAMPARRAY sample_data
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; r11 = JDIMENSION start_col
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; r12 = DCTELEM *workspace
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align 16
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global EXTN(jsimd_convsamp_sse2)
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EXTN(jsimd_convsamp_sse2):
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push rbp
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mov rax,rsp
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mov rbp,rsp
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collect_args
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push rbx
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pxor xmm6,xmm6 ; xmm6=(all 0's)
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pcmpeqw xmm7,xmm7
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psllw xmm7,7 ; xmm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}
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mov rsi, r10
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mov eax, r11d
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mov rdi, r12
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mov rcx, DCTSIZE/4
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.convloop:
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mov rbx, JSAMPROW [rsi+0*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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mov rdx, JSAMPROW [rsi+1*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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movq xmm0, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm0=(01234567)
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movq xmm1, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE] ; xmm1=(89ABCDEF)
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mov rbx, JSAMPROW [rsi+2*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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mov rdx, JSAMPROW [rsi+3*SIZEOF_JSAMPROW] ; (JSAMPLE *)
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movq xmm2, XMM_MMWORD [rbx+rax*SIZEOF_JSAMPLE] ; xmm2=(GHIJKLMN)
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movq xmm3, XMM_MMWORD [rdx+rax*SIZEOF_JSAMPLE] ; xmm3=(OPQRSTUV)
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punpcklbw xmm0,xmm6 ; xmm0=(01234567)
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punpcklbw xmm1,xmm6 ; xmm1=(89ABCDEF)
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paddw xmm0,xmm7
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paddw xmm1,xmm7
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punpcklbw xmm2,xmm6 ; xmm2=(GHIJKLMN)
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punpcklbw xmm3,xmm6 ; xmm3=(OPQRSTUV)
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paddw xmm2,xmm7
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paddw xmm3,xmm7
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movdqa XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
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movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
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movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
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movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
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add rsi, byte 4*SIZEOF_JSAMPROW
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add rdi, byte 4*DCTSIZE*SIZEOF_DCTELEM
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dec rcx
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jnz short .convloop
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pop rbx
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uncollect_args
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pop rbp
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ret
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; --------------------------------------------------------------------------
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;
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; Quantize/descale the coefficients, and store into coef_block
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;
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; This implementation is based on an algorithm described in
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; "How to optimize for the Pentium family of microprocessors"
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; (http://www.agner.org/assem/).
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;
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; GLOBAL(void)
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; jsimd_quantize_sse2 (JCOEFPTR coef_block, DCTELEM *divisors,
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; DCTELEM *workspace);
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;
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%define RECIPROCAL(m,n,b) XMMBLOCK(DCTSIZE*0+(m),(n),(b),SIZEOF_DCTELEM)
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%define CORRECTION(m,n,b) XMMBLOCK(DCTSIZE*1+(m),(n),(b),SIZEOF_DCTELEM)
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%define SCALE(m,n,b) XMMBLOCK(DCTSIZE*2+(m),(n),(b),SIZEOF_DCTELEM)
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; r10 = JCOEFPTR coef_block
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; r11 = DCTELEM *divisors
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; r12 = DCTELEM *workspace
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align 16
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global EXTN(jsimd_quantize_sse2)
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EXTN(jsimd_quantize_sse2):
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push rbp
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mov rax,rsp
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mov rbp,rsp
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collect_args
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mov rsi, r12
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mov rdx, r11
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mov rdi, r10
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mov rax, DCTSIZE2/32
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.quantloop:
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movdqa xmm4, XMMWORD [XMMBLOCK(0,0,rsi,SIZEOF_DCTELEM)]
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movdqa xmm5, XMMWORD [XMMBLOCK(1,0,rsi,SIZEOF_DCTELEM)]
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movdqa xmm6, XMMWORD [XMMBLOCK(2,0,rsi,SIZEOF_DCTELEM)]
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movdqa xmm7, XMMWORD [XMMBLOCK(3,0,rsi,SIZEOF_DCTELEM)]
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movdqa xmm0,xmm4
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movdqa xmm1,xmm5
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movdqa xmm2,xmm6
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movdqa xmm3,xmm7
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psraw xmm4,(WORD_BIT-1)
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psraw xmm5,(WORD_BIT-1)
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psraw xmm6,(WORD_BIT-1)
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psraw xmm7,(WORD_BIT-1)
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pxor xmm0,xmm4
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pxor xmm1,xmm5
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pxor xmm2,xmm6
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pxor xmm3,xmm7
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psubw xmm0,xmm4 ; if (xmm0 < 0) xmm0 = -xmm0;
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psubw xmm1,xmm5 ; if (xmm1 < 0) xmm1 = -xmm1;
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psubw xmm2,xmm6 ; if (xmm2 < 0) xmm2 = -xmm2;
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psubw xmm3,xmm7 ; if (xmm3 < 0) xmm3 = -xmm3;
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paddw xmm0, XMMWORD [CORRECTION(0,0,rdx)] ; correction + roundfactor
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paddw xmm1, XMMWORD [CORRECTION(1,0,rdx)]
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paddw xmm2, XMMWORD [CORRECTION(2,0,rdx)]
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paddw xmm3, XMMWORD [CORRECTION(3,0,rdx)]
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pmulhuw xmm0, XMMWORD [RECIPROCAL(0,0,rdx)] ; reciprocal
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pmulhuw xmm1, XMMWORD [RECIPROCAL(1,0,rdx)]
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pmulhuw xmm2, XMMWORD [RECIPROCAL(2,0,rdx)]
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pmulhuw xmm3, XMMWORD [RECIPROCAL(3,0,rdx)]
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pmulhuw xmm0, XMMWORD [SCALE(0,0,rdx)] ; scale
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pmulhuw xmm1, XMMWORD [SCALE(1,0,rdx)]
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pmulhuw xmm2, XMMWORD [SCALE(2,0,rdx)]
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pmulhuw xmm3, XMMWORD [SCALE(3,0,rdx)]
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pxor xmm0,xmm4
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pxor xmm1,xmm5
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pxor xmm2,xmm6
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pxor xmm3,xmm7
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psubw xmm0,xmm4
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psubw xmm1,xmm5
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psubw xmm2,xmm6
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psubw xmm3,xmm7
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movdqa XMMWORD [XMMBLOCK(0,0,rdi,SIZEOF_DCTELEM)], xmm0
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movdqa XMMWORD [XMMBLOCK(1,0,rdi,SIZEOF_DCTELEM)], xmm1
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movdqa XMMWORD [XMMBLOCK(2,0,rdi,SIZEOF_DCTELEM)], xmm2
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movdqa XMMWORD [XMMBLOCK(3,0,rdi,SIZEOF_DCTELEM)], xmm3
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add rsi, byte 32*SIZEOF_DCTELEM
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add rdx, byte 32*SIZEOF_DCTELEM
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add rdi, byte 32*SIZEOF_JCOEF
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dec rax
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jnz near .quantloop
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uncollect_args
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pop rbp
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ret
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; For some reason, the OS X linker does not honor the request to align the
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; segment unless we do this.
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align 16
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