--- /dev/null
+;
+; jfdctint.asm - accurate integer FDCT (AVX2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright (C) 2009, 2016, 2018, 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
+;
+; This file contains a slow-but-accurate integer implementation of the
+; forward DCT (Discrete Cosine Transform). The following code is based
+; directly on the IJG's original jfdctint.c; see the jfdctint.c for
+; more details.
+;
+; [TAB8]
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS 13
+%define PASS1_BITS 2
+
+%define DESCALE_P1 (CONST_BITS-PASS1_BITS)
+%define DESCALE_P2 (CONST_BITS+PASS1_BITS)
+
+%if CONST_BITS == 13
+F_0_298 equ 2446 ; FIX(0.298631336)
+F_0_390 equ 3196 ; FIX(0.390180644)
+F_0_541 equ 4433 ; FIX(0.541196100)
+F_0_765 equ 6270 ; FIX(0.765366865)
+F_0_899 equ 7373 ; FIX(0.899976223)
+F_1_175 equ 9633 ; FIX(1.175875602)
+F_1_501 equ 12299 ; FIX(1.501321110)
+F_1_847 equ 15137 ; FIX(1.847759065)
+F_1_961 equ 16069 ; FIX(1.961570560)
+F_2_053 equ 16819 ; FIX(2.053119869)
+F_2_562 equ 20995 ; FIX(2.562915447)
+F_3_072 equ 25172 ; FIX(3.072711026)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n))
+F_0_298 equ DESCALE( 320652955, 30-CONST_BITS) ; FIX(0.298631336)
+F_0_390 equ DESCALE( 418953276, 30-CONST_BITS) ; FIX(0.390180644)
+F_0_541 equ DESCALE( 581104887, 30-CONST_BITS) ; FIX(0.541196100)
+F_0_765 equ DESCALE( 821806413, 30-CONST_BITS) ; FIX(0.765366865)
+F_0_899 equ DESCALE( 966342111, 30-CONST_BITS) ; FIX(0.899976223)
+F_1_175 equ DESCALE(1262586813, 30-CONST_BITS) ; FIX(1.175875602)
+F_1_501 equ DESCALE(1612031267, 30-CONST_BITS) ; FIX(1.501321110)
+F_1_847 equ DESCALE(1984016188, 30-CONST_BITS) ; FIX(1.847759065)
+F_1_961 equ DESCALE(2106220350, 30-CONST_BITS) ; FIX(1.961570560)
+F_2_053 equ DESCALE(2204520673, 30-CONST_BITS) ; FIX(2.053119869)
+F_2_562 equ DESCALE(2751909506, 30-CONST_BITS) ; FIX(2.562915447)
+F_3_072 equ DESCALE(3299298341, 30-CONST_BITS) ; FIX(3.072711026)
+%endif
+
+; --------------------------------------------------------------------------
+; In-place 8x8x16-bit matrix transpose using AVX2 instructions
+; %1-%4: Input/output registers
+; %5-%8: Temp registers
+
+%macro dotranspose 8
+ ; %1=(00 01 02 03 04 05 06 07 40 41 42 43 44 45 46 47)
+ ; %2=(10 11 12 13 14 15 16 17 50 51 52 53 54 55 56 57)
+ ; %3=(20 21 22 23 24 25 26 27 60 61 62 63 64 65 66 67)
+ ; %4=(30 31 32 33 34 35 36 37 70 71 72 73 74 75 76 77)
+
+ vpunpcklwd %5, %1, %2
+ vpunpckhwd %6, %1, %2
+ vpunpcklwd %7, %3, %4
+ vpunpckhwd %8, %3, %4
+ ; transpose coefficients(phase 1)
+ ; %5=(00 10 01 11 02 12 03 13 40 50 41 51 42 52 43 53)
+ ; %6=(04 14 05 15 06 16 07 17 44 54 45 55 46 56 47 57)
+ ; %7=(20 30 21 31 22 32 23 33 60 70 61 71 62 72 63 73)
+ ; %8=(24 34 25 35 26 36 27 37 64 74 65 75 66 76 67 77)
+
+ vpunpckldq %1, %5, %7
+ vpunpckhdq %2, %5, %7
+ vpunpckldq %3, %6, %8
+ vpunpckhdq %4, %6, %8
+ ; transpose coefficients(phase 2)
+ ; %1=(00 10 20 30 01 11 21 31 40 50 60 70 41 51 61 71)
+ ; %2=(02 12 22 32 03 13 23 33 42 52 62 72 43 53 63 73)
+ ; %3=(04 14 24 34 05 15 25 35 44 54 64 74 45 55 65 75)
+ ; %4=(06 16 26 36 07 17 27 37 46 56 66 76 47 57 67 77)
+
+ vpermq %1, %1, 0x8D
+ vpermq %2, %2, 0x8D
+ vpermq %3, %3, 0xD8
+ vpermq %4, %4, 0xD8
+ ; transpose coefficients(phase 3)
+ ; %1=(01 11 21 31 41 51 61 71 00 10 20 30 40 50 60 70)
+ ; %2=(03 13 23 33 43 53 63 73 02 12 22 32 42 52 62 72)
+ ; %3=(04 14 24 34 44 54 64 74 05 15 25 35 45 55 65 75)
+ ; %4=(06 16 26 36 46 56 66 76 07 17 27 37 47 57 67 77)
+%endmacro
+
+; --------------------------------------------------------------------------
+; In-place 8x8x16-bit slow integer forward DCT using AVX2 instructions
+; %1-%4: Input/output registers
+; %5-%8: Temp registers
+; %9: Pass (1 or 2)
+
+%macro dodct 9
+ vpsubw %5, %1, %4 ; %5=data1_0-data6_7=tmp6_7
+ vpaddw %6, %1, %4 ; %6=data1_0+data6_7=tmp1_0
+ vpaddw %7, %2, %3 ; %7=data3_2+data4_5=tmp3_2
+ vpsubw %8, %2, %3 ; %8=data3_2-data4_5=tmp4_5
+
+ ; -- Even part
+
+ vperm2i128 %6, %6, %6, 0x01 ; %6=tmp0_1
+ vpaddw %1, %6, %7 ; %1=tmp0_1+tmp3_2=tmp10_11
+ vpsubw %6, %6, %7 ; %6=tmp0_1-tmp3_2=tmp13_12
+
+ vperm2i128 %7, %1, %1, 0x01 ; %7=tmp11_10
+ vpsignw %1, %1, [GOTOFF(ebx, PW_1_NEG1)] ; %1=tmp10_neg11
+ vpaddw %7, %7, %1 ; %7=(tmp10+tmp11)_(tmp10-tmp11)
+%if %9 == 1
+ vpsllw %1, %7, PASS1_BITS ; %1=data0_4
+%else
+ vpaddw %7, %7, [GOTOFF(ebx, PW_DESCALE_P2X)]
+ vpsraw %1, %7, PASS1_BITS ; %1=data0_4
+%endif
+
+ ; (Original)
+ ; z1 = (tmp12 + tmp13) * 0.541196100;
+ ; data2 = z1 + tmp13 * 0.765366865;
+ ; data6 = z1 + tmp12 * -1.847759065;
+ ;
+ ; (This implementation)
+ ; data2 = tmp13 * (0.541196100 + 0.765366865) + tmp12 * 0.541196100;
+ ; data6 = tmp13 * 0.541196100 + tmp12 * (0.541196100 - 1.847759065);
+
+ vperm2i128 %7, %6, %6, 0x01 ; %7=tmp12_13
+ vpunpcklwd %2, %6, %7
+ vpunpckhwd %6, %6, %7
+ vpmaddwd %2, %2, [GOTOFF(ebx, PW_F130_F054_MF130_F054)] ; %2=data2_6L
+ vpmaddwd %6, %6, [GOTOFF(ebx, PW_F130_F054_MF130_F054)] ; %6=data2_6H
+
+ vpaddd %2, %2, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpaddd %6, %6, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpsrad %2, %2, DESCALE_P %+ %9
+ vpsrad %6, %6, DESCALE_P %+ %9
+
+ vpackssdw %3, %2, %6 ; %6=data2_6
+
+ ; -- Odd part
+
+ vpaddw %7, %8, %5 ; %7=tmp4_5+tmp6_7=z3_4
+
+ ; (Original)
+ ; z5 = (z3 + z4) * 1.175875602;
+ ; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644;
+ ; z3 += z5; z4 += z5;
+ ;
+ ; (This implementation)
+ ; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
+ ; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
+
+ vperm2i128 %2, %7, %7, 0x01 ; %2=z4_3
+ vpunpcklwd %6, %7, %2
+ vpunpckhwd %7, %7, %2
+ vpmaddwd %6, %6, [GOTOFF(ebx, PW_MF078_F117_F078_F117)] ; %6=z3_4L
+ vpmaddwd %7, %7, [GOTOFF(ebx, PW_MF078_F117_F078_F117)] ; %7=z3_4H
+
+ ; (Original)
+ ; z1 = tmp4 + tmp7; z2 = tmp5 + tmp6;
+ ; tmp4 = tmp4 * 0.298631336; tmp5 = tmp5 * 2.053119869;
+ ; tmp6 = tmp6 * 3.072711026; tmp7 = tmp7 * 1.501321110;
+ ; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
+ ; data7 = tmp4 + z1 + z3; data5 = tmp5 + z2 + z4;
+ ; data3 = tmp6 + z2 + z3; data1 = tmp7 + z1 + z4;
+ ;
+ ; (This implementation)
+ ; tmp4 = tmp4 * (0.298631336 - 0.899976223) + tmp7 * -0.899976223;
+ ; tmp5 = tmp5 * (2.053119869 - 2.562915447) + tmp6 * -2.562915447;
+ ; tmp6 = tmp5 * -2.562915447 + tmp6 * (3.072711026 - 2.562915447);
+ ; tmp7 = tmp4 * -0.899976223 + tmp7 * (1.501321110 - 0.899976223);
+ ; data7 = tmp4 + z3; data5 = tmp5 + z4;
+ ; data3 = tmp6 + z3; data1 = tmp7 + z4;
+
+ vperm2i128 %4, %5, %5, 0x01 ; %4=tmp7_6
+ vpunpcklwd %2, %8, %4
+ vpunpckhwd %4, %8, %4
+ vpmaddwd %2, %2, [GOTOFF(ebx, PW_MF060_MF089_MF050_MF256)] ; %2=tmp4_5L
+ vpmaddwd %4, %4, [GOTOFF(ebx, PW_MF060_MF089_MF050_MF256)] ; %4=tmp4_5H
+
+ vpaddd %2, %2, %6 ; %2=data7_5L
+ vpaddd %4, %4, %7 ; %4=data7_5H
+
+ vpaddd %2, %2, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpaddd %4, %4, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpsrad %2, %2, DESCALE_P %+ %9
+ vpsrad %4, %4, DESCALE_P %+ %9
+
+ vpackssdw %4, %2, %4 ; %4=data7_5
+
+ vperm2i128 %2, %8, %8, 0x01 ; %2=tmp5_4
+ vpunpcklwd %8, %5, %2
+ vpunpckhwd %5, %5, %2
+ vpmaddwd %8, %8, [GOTOFF(ebx, PW_F050_MF256_F060_MF089)] ; %8=tmp6_7L
+ vpmaddwd %5, %5, [GOTOFF(ebx, PW_F050_MF256_F060_MF089)] ; %5=tmp6_7H
+
+ vpaddd %8, %8, %6 ; %8=data3_1L
+ vpaddd %5, %5, %7 ; %5=data3_1H
+
+ vpaddd %8, %8, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpaddd %5, %5, [GOTOFF(ebx, PD_DESCALE_P %+ %9)]
+ vpsrad %8, %8, DESCALE_P %+ %9
+ vpsrad %5, %5, DESCALE_P %+ %9
+
+ vpackssdw %2, %8, %5 ; %2=data3_1
+%endmacro
+
+; --------------------------------------------------------------------------
+ SECTION SEG_CONST
+
+ alignz 32
+ global EXTN(jconst_fdct_islow_avx2)
+
+EXTN(jconst_fdct_islow_avx2):
+
+PW_F130_F054_MF130_F054 times 4 dw (F_0_541+F_0_765), F_0_541
+ times 4 dw (F_0_541-F_1_847), F_0_541
+PW_MF078_F117_F078_F117 times 4 dw (F_1_175-F_1_961), F_1_175
+ times 4 dw (F_1_175-F_0_390), F_1_175
+PW_MF060_MF089_MF050_MF256 times 4 dw (F_0_298-F_0_899), -F_0_899
+ times 4 dw (F_2_053-F_2_562), -F_2_562
+PW_F050_MF256_F060_MF089 times 4 dw (F_3_072-F_2_562), -F_2_562
+ times 4 dw (F_1_501-F_0_899), -F_0_899
+PD_DESCALE_P1 times 8 dd 1 << (DESCALE_P1-1)
+PD_DESCALE_P2 times 8 dd 1 << (DESCALE_P2-1)
+PW_DESCALE_P2X times 16 dw 1 << (PASS1_BITS-1)
+PW_1_NEG1 times 8 dw 1
+ times 8 dw -1
+
+ alignz 32
+
+; --------------------------------------------------------------------------
+ SECTION SEG_TEXT
+ BITS 32
+;
+; Perform the forward DCT on one block of samples.
+;
+; GLOBAL(void)
+; jsimd_fdct_islow_avx2 (DCTELEM *data)
+;
+
+%define data(b) (b)+8 ; DCTELEM *data
+
+ align 32
+ global EXTN(jsimd_fdct_islow_avx2)
+
+EXTN(jsimd_fdct_islow_avx2):
+ push ebp
+ mov ebp, esp
+ pushpic ebx
+; push ecx ; unused
+; push edx ; need not be preserved
+; push esi ; unused
+; push edi ; unused
+
+ get_GOT ebx ; get GOT address
+
+ ; ---- Pass 1: process rows.
+
+ mov edx, POINTER [data(ebp)] ; (DCTELEM *)
+
+ vmovdqu ymm4, YMMWORD [YMMBLOCK(0,0,edx,SIZEOF_DCTELEM)]
+ vmovdqu ymm5, YMMWORD [YMMBLOCK(2,0,edx,SIZEOF_DCTELEM)]
+ vmovdqu ymm6, YMMWORD [YMMBLOCK(4,0,edx,SIZEOF_DCTELEM)]
+ vmovdqu ymm7, YMMWORD [YMMBLOCK(6,0,edx,SIZEOF_DCTELEM)]
+ ; ymm4=(00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17)
+ ; ymm5=(20 21 22 23 24 25 26 27 30 31 32 33 34 35 36 37)
+ ; ymm6=(40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57)
+ ; ymm7=(60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77)
+
+ vperm2i128 ymm0, ymm4, ymm6, 0x20
+ vperm2i128 ymm1, ymm4, ymm6, 0x31
+ vperm2i128 ymm2, ymm5, ymm7, 0x20
+ vperm2i128 ymm3, ymm5, ymm7, 0x31
+ ; ymm0=(00 01 02 03 04 05 06 07 40 41 42 43 44 45 46 47)
+ ; ymm1=(10 11 12 13 14 15 16 17 50 51 52 53 54 55 56 57)
+ ; ymm2=(20 21 22 23 24 25 26 27 60 61 62 63 64 65 66 67)
+ ; ymm3=(30 31 32 33 34 35 36 37 70 71 72 73 74 75 76 77)
+
+ dotranspose ymm0, ymm1, ymm2, ymm3, ymm4, ymm5, ymm6, ymm7
+
+ dodct ymm0, ymm1, ymm2, ymm3, ymm4, ymm5, ymm6, ymm7, 1
+ ; ymm0=data0_4, ymm1=data3_1, ymm2=data2_6, ymm3=data7_5
+
+ ; ---- Pass 2: process columns.
+
+ vperm2i128 ymm4, ymm1, ymm3, 0x20 ; ymm4=data3_7
+ vperm2i128 ymm1, ymm1, ymm3, 0x31 ; ymm1=data1_5
+
+ dotranspose ymm0, ymm1, ymm2, ymm4, ymm3, ymm5, ymm6, ymm7
+
+ dodct ymm0, ymm1, ymm2, ymm4, ymm3, ymm5, ymm6, ymm7, 2
+ ; ymm0=data0_4, ymm1=data3_1, ymm2=data2_6, ymm4=data7_5
+
+ vperm2i128 ymm3, ymm0, ymm1, 0x30 ; ymm3=data0_1
+ vperm2i128 ymm5, ymm2, ymm1, 0x20 ; ymm5=data2_3
+ vperm2i128 ymm6, ymm0, ymm4, 0x31 ; ymm6=data4_5
+ vperm2i128 ymm7, ymm2, ymm4, 0x21 ; ymm7=data6_7
+
+ vmovdqu YMMWORD [YMMBLOCK(0,0,edx,SIZEOF_DCTELEM)], ymm3
+ vmovdqu YMMWORD [YMMBLOCK(2,0,edx,SIZEOF_DCTELEM)], ymm5
+ vmovdqu YMMWORD [YMMBLOCK(4,0,edx,SIZEOF_DCTELEM)], ymm6
+ vmovdqu YMMWORD [YMMBLOCK(6,0,edx,SIZEOF_DCTELEM)], ymm7
+
+ vzeroupper
+; pop edi ; unused
+; pop esi ; unused
+; pop edx ; need not be preserved
+; pop ecx ; unused
+ poppic ebx
+ 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
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