;

; jquanti.asm - sample data conversion and quantization (64-bit AVX2)

;

; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB</ossman@cendio.se>

; Copyright (C) 2009, 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        64

;

; Load data into workspace, applying unsigned->signed conversion

;

; GLOBAL(void)

; jsimd_convsamp_avx2(JSAMPARRAY sample_data, JDIMENSION start_col,

;                     DCTELEM *workspace);

;

; r10 = JSAMPARRAY sample_data

; r11d = JDIMENSION start_col

; r12 = DCTELEM *workspace

    align       32

    GLOBAL_FUNCTION(jsimd_convsamp_avx2)

EXTN(jsimd_convsamp_avx2):

    push        rbp

    mov         rax, rsp

    mov         rbp, rsp

    collect_args 3

    mov         eax, r11d

    mov         rsi, JSAMPROW [r10+0*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    mov         rdi, JSAMPROW [r10+1*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    movq        xmm0, XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE]

    pinsrq      xmm0, XMM_MMWORD [rdi+rax*SIZEOF_JSAMPLE], 1

    mov         rsi, JSAMPROW [r10+2*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    mov         rdi, JSAMPROW [r10+3*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    movq        xmm1, XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE]

    pinsrq      xmm1, XMM_MMWORD [rdi+rax*SIZEOF_JSAMPLE], 1

    mov         rsi, JSAMPROW [r10+4*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    mov         rdi, JSAMPROW [r10+5*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    movq        xmm2, XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE]

    pinsrq      xmm2, XMM_MMWORD [rdi+rax*SIZEOF_JSAMPLE], 1

    mov         rsi, JSAMPROW [r10+6*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    mov         rdi, JSAMPROW [r10+7*SIZEOF_JSAMPROW]  ; (JSAMPLE *)

    movq        xmm3, XMM_MMWORD [rsi+rax*SIZEOF_JSAMPLE]

    pinsrq      xmm3, XMM_MMWORD [rdi+rax*SIZEOF_JSAMPLE], 1

    vpmovzxbw   ymm0, xmm0              ; ymm0=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)

    vpmovzxbw   ymm1, xmm1              ; ymm1=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)

    vpmovzxbw   ymm2, xmm2              ; ymm2=(40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57)

    vpmovzxbw   ymm3, xmm3              ; ymm3=(60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77)

    vpcmpeqw    ymm7, ymm7, ymm7

    vpsllw      ymm7, ymm7, 7           ; ymm7={0xFF80 0xFF80 0xFF80 0xFF80 ..}

    vpaddw      ymm0, ymm0, ymm7

    vpaddw      ymm1, ymm1, ymm7

    vpaddw      ymm2, ymm2, ymm7

    vpaddw      ymm3, ymm3, ymm7

    vmovdqu     YMMWORD [YMMBLOCK(0,0,r12,SIZEOF_DCTELEM)], ymm0

    vmovdqu     YMMWORD [YMMBLOCK(2,0,r12,SIZEOF_DCTELEM)], ymm1

    vmovdqu     YMMWORD [YMMBLOCK(4,0,r12,SIZEOF_DCTELEM)], ymm2

    vmovdqu     YMMWORD [YMMBLOCK(6,0,r12,SIZEOF_DCTELEM)], ymm3

    vzeroupper

    uncollect_args 3

    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_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)

; r10 = JCOEFPTR coef_block

; r11 = DCTELEM *divisors

; r12 = DCTELEM *workspace

    align       32

    GLOBAL_FUNCTION(jsimd_quantize_avx2)

EXTN(jsimd_quantize_avx2):

    push        rbp

    mov         rax, rsp

    mov         rbp, rsp

    collect_args 3

    vmovdqu     ymm4, [YMMBLOCK(0,0,r12,SIZEOF_DCTELEM)]

    vmovdqu     ymm5, [YMMBLOCK(2,0,r12,SIZEOF_DCTELEM)]

    vmovdqu     ymm6, [YMMBLOCK(4,0,r12,SIZEOF_DCTELEM)]

    vmovdqu     ymm7, [YMMBLOCK(6,0,r12,SIZEOF_DCTELEM)]

    vpabsw      ymm0, ymm4

    vpabsw      ymm1, ymm5

    vpabsw      ymm2, ymm6

    vpabsw      ymm3, ymm7

    vpaddw      ymm0, YMMWORD [CORRECTION(0,0,r11)]  ; correction + roundfactor

    vpaddw      ymm1, YMMWORD [CORRECTION(2,0,r11)]

    vpaddw      ymm2, YMMWORD [CORRECTION(4,0,r11)]

    vpaddw      ymm3, YMMWORD [CORRECTION(6,0,r11)]

    vpmulhuw    ymm0, YMMWORD [RECIPROCAL(0,0,r11)]  ; reciprocal

    vpmulhuw    ymm1, YMMWORD [RECIPROCAL(2,0,r11)]

    vpmulhuw    ymm2, YMMWORD [RECIPROCAL(4,0,r11)]

    vpmulhuw    ymm3, YMMWORD [RECIPROCAL(6,0,r11)]

    vpmulhuw    ymm0, YMMWORD [SCALE(0,0,r11)]       ; scale

    vpmulhuw    ymm1, YMMWORD [SCALE(2,0,r11)]

    vpmulhuw    ymm2, YMMWORD [SCALE(4,0,r11)]

    vpmulhuw    ymm3, YMMWORD [SCALE(6,0,r11)]

    vpsignw     ymm0, ymm0, ymm4

    vpsignw     ymm1, ymm1, ymm5

    vpsignw     ymm2, ymm2, ymm6

    vpsignw     ymm3, ymm3, ymm7

    vmovdqu     [YMMBLOCK(0,0,r10,SIZEOF_DCTELEM)], ymm0

    vmovdqu     [YMMBLOCK(2,0,r10,SIZEOF_DCTELEM)], ymm1

    vmovdqu     [YMMBLOCK(4,0,r10,SIZEOF_DCTELEM)], ymm2

    vmovdqu     [YMMBLOCK(6,0,r10,SIZEOF_DCTELEM)], ymm3

    vzeroupper

    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