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+;
+; jchuff-sse2.asm - Huffman entropy encoding (64-bit SSE2)
+;
+; Copyright (C) 2009-2011, 2014-2016, 2019, 2021, D. R. Commander.
+; Copyright (C) 2015, Matthieu Darbois.
+; 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
+;
+; This file contains an SSE2 implementation for Huffman coding of one block.
+; The following code is based on jchuff.c; see jchuff.c for more details.
+
+%include "jsimdext.inc"
+
+struc working_state
+.next_output_byte: resp 1 ; => next byte to write in buffer
+.free_in_buffer: resp 1 ; # of byte spaces remaining in buffer
+.cur.put_buffer.simd resq 1 ; current bit accumulation buffer
+.cur.free_bits resd 1 ; # of bits available in it
+.cur.last_dc_val resd 4 ; last DC coef for each component
+.cinfo: resp 1 ; dump_buffer needs access to this
+endstruc
+
+struc c_derived_tbl
+.ehufco: resd 256 ; code for each symbol
+.ehufsi: resb 256 ; length of code for each symbol
+; If no code has been allocated for a symbol S, ehufsi[S] contains 0
+endstruc
+
+; --------------------------------------------------------------------------
+ SECTION SEG_CONST
+
+ alignz 32
+ GLOBAL_DATA(jconst_huff_encode_one_block)
+
+EXTN(jconst_huff_encode_one_block):
+
+jpeg_mask_bits dd 0x0000, 0x0001, 0x0003, 0x0007
+ dd 0x000f, 0x001f, 0x003f, 0x007f
+ dd 0x00ff, 0x01ff, 0x03ff, 0x07ff
+ dd 0x0fff, 0x1fff, 0x3fff, 0x7fff
+
+ alignz 32
+
+times 1 << 14 db 15
+times 1 << 13 db 14
+times 1 << 12 db 13
+times 1 << 11 db 12
+times 1 << 10 db 11
+times 1 << 9 db 10
+times 1 << 8 db 9
+times 1 << 7 db 8
+times 1 << 6 db 7
+times 1 << 5 db 6
+times 1 << 4 db 5
+times 1 << 3 db 4
+times 1 << 2 db 3
+times 1 << 1 db 2
+times 1 << 0 db 1
+times 1 db 0
+jpeg_nbits_table:
+times 1 db 0
+times 1 << 0 db 1
+times 1 << 1 db 2
+times 1 << 2 db 3
+times 1 << 3 db 4
+times 1 << 4 db 5
+times 1 << 5 db 6
+times 1 << 6 db 7
+times 1 << 7 db 8
+times 1 << 8 db 9
+times 1 << 9 db 10
+times 1 << 10 db 11
+times 1 << 11 db 12
+times 1 << 12 db 13
+times 1 << 13 db 14
+times 1 << 14 db 15
+times 1 << 15 db 16
+
+ alignz 32
+
+%define NBITS(x) nbits_base + x
+%define MASK_BITS(x) NBITS((x) * 4) + (jpeg_mask_bits - jpeg_nbits_table)
+
+; --------------------------------------------------------------------------
+ SECTION SEG_TEXT
+ BITS 64
+
+; Shorthand used to describe SIMD operations:
+; wN: xmmN treated as eight signed 16-bit values
+; wN[i]: perform the same operation on all eight signed 16-bit values, i=0..7
+; bN: xmmN treated as 16 unsigned 8-bit values
+; bN[i]: perform the same operation on all 16 unsigned 8-bit values, i=0..15
+; Contents of SIMD registers are shown in memory order.
+
+; Fill the bit buffer to capacity with the leading bits from code, then output
+; the bit buffer and put the remaining bits from code into the bit buffer.
+;
+; Usage:
+; code - contains the bits to shift into the bit buffer (LSB-aligned)
+; %1 - the label to which to jump when the macro completes
+; %2 (optional) - extra instructions to execute after nbits has been set
+;
+; Upon completion, free_bits will be set to the number of remaining bits from
+; code, and put_buffer will contain those remaining bits. temp and code will
+; be clobbered.
+;
+; This macro encodes any 0xFF bytes as 0xFF 0x00, as does the EMIT_BYTE()
+; macro in jchuff.c.
+
+%macro EMIT_QWORD 1-2
+ add nbitsb, free_bitsb ; nbits += free_bits;
+ neg free_bitsb ; free_bits = -free_bits;
+ mov tempd, code ; temp = code;
+ shl put_buffer, nbitsb ; put_buffer <<= nbits;
+ mov nbitsb, free_bitsb ; nbits = free_bits;
+ neg free_bitsb ; free_bits = -free_bits;
+ shr tempd, nbitsb ; temp >>= nbits;
+ or tempq, put_buffer ; temp |= put_buffer;
+ movq xmm0, tempq ; xmm0.u64 = { temp, 0 };
+ bswap tempq ; temp = htonl(temp);
+ mov put_buffer, codeq ; put_buffer = code;
+ pcmpeqb xmm0, xmm1 ; b0[i] = (b0[i] == 0xFF ? 0xFF : 0);
+ %2
+ pmovmskb code, xmm0 ; code = 0; code |= ((b0[i] >> 7) << i);
+ mov qword [buffer], tempq ; memcpy(buffer, &temp, 8);
+ ; (speculative; will be overwritten if
+ ; code contains any 0xFF bytes)
+ add free_bitsb, 64 ; free_bits += 64;
+ add bufferp, 8 ; buffer += 8;
+ test code, code ; if (code == 0) /* No 0xFF bytes */
+ jz %1 ; return;
+ ; Execute the equivalent of the EMIT_BYTE() macro in jchuff.c for all 8
+ ; bytes in the qword.
+ cmp tempb, 0xFF ; Set CF if temp[0] < 0xFF
+ mov byte [buffer-7], 0 ; buffer[-7] = 0;
+ sbb bufferp, 6 ; buffer -= (6 + (temp[0] < 0xFF ? 1 : 0));
+ mov byte [buffer], temph ; buffer[0] = temp[1];
+ cmp temph, 0xFF ; Set CF if temp[1] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
+ shr tempq, 16 ; temp >>= 16;
+ mov byte [buffer], tempb ; buffer[0] = temp[0];
+ cmp tempb, 0xFF ; Set CF if temp[0] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[0] < 0xFF ? 1 : 0));
+ mov byte [buffer], temph ; buffer[0] = temp[1];
+ cmp temph, 0xFF ; Set CF if temp[1] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
+ shr tempq, 16 ; temp >>= 16;
+ mov byte [buffer], tempb ; buffer[0] = temp[0];
+ cmp tempb, 0xFF ; Set CF if temp[0] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[0] < 0xFF ? 1 : 0));
+ mov byte [buffer], temph ; buffer[0] = temp[1];
+ cmp temph, 0xFF ; Set CF if temp[1] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
+ shr tempd, 16 ; temp >>= 16;
+ mov byte [buffer], tempb ; buffer[0] = temp[0];
+ cmp tempb, 0xFF ; Set CF if temp[0] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[0] < 0xFF ? 1 : 0));
+ mov byte [buffer], temph ; buffer[0] = temp[1];
+ cmp temph, 0xFF ; Set CF if temp[1] < 0xFF
+ mov byte [buffer+1], 0 ; buffer[1] = 0;
+ sbb bufferp, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
+ jmp %1 ; return;
+%endmacro
+
+;
+; Encode a single block's worth of coefficients.
+;
+; GLOBAL(JOCTET *)
+; jsimd_huff_encode_one_block_sse2(working_state *state, JOCTET *buffer,
+; JCOEFPTR block, int last_dc_val,
+; c_derived_tbl *dctbl, c_derived_tbl *actbl)
+;
+; NOTES:
+; When shuffling data, we try to avoid pinsrw as much as possible, since it is
+; slow on many CPUs. Its reciprocal throughput (issue latency) is 1 even on
+; modern CPUs, so chains of pinsrw instructions (even with different outputs)
+; can limit performance. pinsrw is a VectorPath instruction on AMD K8 and
+; requires 2 µops (with memory operand) on Intel. In either case, only one
+; pinsrw instruction can be decoded per cycle (and nothing else if they are
+; back-to-back), so out-of-order execution cannot be used to work around long
+; pinsrw chains (though for Sandy Bridge and later, this may be less of a
+; problem if the code runs from the µop cache.)
+;
+; We use tzcnt instead of bsf without checking for support. The instruction is
+; executed as bsf on CPUs that don't support tzcnt (encoding is equivalent to
+; rep bsf.) The destination (first) operand of bsf (and tzcnt on some CPUs) is
+; an input dependency (although the behavior is not formally defined, Intel
+; CPUs usually leave the destination unmodified if the source is zero.) This
+; can prevent out-of-order execution, so we clear the destination before
+; invoking tzcnt.
+;
+; Initial register allocation
+; rax - buffer
+; rbx - temp
+; rcx - nbits
+; rdx - block --> free_bits
+; rsi - nbits_base
+; rdi - t
+; rbp - code
+; r8 - dctbl --> code_temp
+; r9 - actbl
+; r10 - state
+; r11 - index
+; r12 - put_buffer
+
+%define buffer rax
+%ifdef WIN64
+%define bufferp rax
+%else
+%define bufferp raxp
+%endif
+%define tempq rbx
+%define tempd ebx
+%define tempb bl
+%define temph bh
+%define nbitsq rcx
+%define nbits ecx
+%define nbitsb cl
+%define block rdx
+%define nbits_base rsi
+%define t rdi
+%define td edi
+%define codeq rbp
+%define code ebp
+%define dctbl r8
+%define actbl r9
+%define state r10
+%define index r11
+%define indexd r11d
+%define put_buffer r12
+%define put_bufferd r12d
+
+; Step 1: Re-arrange input data according to jpeg_natural_order
+; xx 01 02 03 04 05 06 07 xx 01 08 16 09 02 03 10
+; 08 09 10 11 12 13 14 15 17 24 32 25 18 11 04 05
+; 16 17 18 19 20 21 22 23 12 19 26 33 40 48 41 34
+; 24 25 26 27 28 29 30 31 ==> 27 20 13 06 07 14 21 28
+; 32 33 34 35 36 37 38 39 35 42 49 56 57 50 43 36
+; 40 41 42 43 44 45 46 47 29 22 15 23 30 37 44 51
+; 48 49 50 51 52 53 54 55 58 59 52 45 38 31 39 46
+; 56 57 58 59 60 61 62 63 53 60 61 54 47 55 62 63
+
+ align 32
+ GLOBAL_FUNCTION(jsimd_huff_encode_one_block_sse2)
+
+EXTN(jsimd_huff_encode_one_block_sse2):
+
+%ifdef WIN64
+
+; rcx = working_state *state
+; rdx = JOCTET *buffer
+; r8 = JCOEFPTR block
+; r9 = int last_dc_val
+; [rax+48] = c_derived_tbl *dctbl
+; [rax+56] = c_derived_tbl *actbl
+
+ ;X: X = code stream
+ mov buffer, rdx
+ mov block, r8
+ movups xmm3, XMMWORD [block + 0 * SIZEOF_WORD] ;D: w3 = xx 01 02 03 04 05 06 07
+ push rbx
+ push rbp
+ movdqa xmm0, xmm3 ;A: w0 = xx 01 02 03 04 05 06 07
+ push rsi
+ push rdi
+ push r12
+ movups xmm1, XMMWORD [block + 8 * SIZEOF_WORD] ;B: w1 = 08 09 10 11 12 13 14 15
+ mov state, rcx
+ movsx code, word [block] ;Z: code = block[0];
+ pxor xmm4, xmm4 ;A: w4[i] = 0;
+ sub code, r9d ;Z: code -= last_dc_val;
+ mov dctbl, POINTER [rsp+6*8+4*8]
+ mov actbl, POINTER [rsp+6*8+5*8]
+ punpckldq xmm0, xmm1 ;A: w0 = xx 01 08 09 02 03 10 11
+ lea nbits_base, [rel jpeg_nbits_table]
+ add rsp, -DCTSIZE2 * SIZEOF_WORD
+ mov t, rsp
+
+%else
+
+; rdi = working_state *state
+; rsi = JOCTET *buffer
+; rdx = JCOEFPTR block
+; rcx = int last_dc_val
+; r8 = c_derived_tbl *dctbl
+; r9 = c_derived_tbl *actbl
+
+ ;X: X = code stream
+ movups xmm3, XMMWORD [block + 0 * SIZEOF_WORD] ;D: w3 = xx 01 02 03 04 05 06 07
+ push rbx
+ push rbp
+ movdqa xmm0, xmm3 ;A: w0 = xx 01 02 03 04 05 06 07
+ push r12
+ mov state, rdi
+ mov buffer, rsi
+ movups xmm1, XMMWORD [block + 8 * SIZEOF_WORD] ;B: w1 = 08 09 10 11 12 13 14 15
+ movsx codeq, word [block] ;Z: code = block[0];
+ lea nbits_base, [rel jpeg_nbits_table]
+ pxor xmm4, xmm4 ;A: w4[i] = 0;
+ sub codeq, rcx ;Z: code -= last_dc_val;
+ punpckldq xmm0, xmm1 ;A: w0 = xx 01 08 09 02 03 10 11
+ lea t, [rsp - DCTSIZE2 * SIZEOF_WORD] ; use red zone for t_
+
+%endif
+
+ pshuflw xmm0, xmm0, 11001001b ;A: w0 = 01 08 xx 09 02 03 10 11
+ pinsrw xmm0, word [block + 16 * SIZEOF_WORD], 2 ;A: w0 = 01 08 16 09 02 03 10 11
+ punpckhdq xmm3, xmm1 ;D: w3 = 04 05 12 13 06 07 14 15
+ punpcklqdq xmm1, xmm3 ;B: w1 = 08 09 10 11 04 05 12 13
+ pinsrw xmm0, word [block + 17 * SIZEOF_WORD], 7 ;A: w0 = 01 08 16 09 02 03 10 17
+ ;A: (Row 0, offset 1)
+ pcmpgtw xmm4, xmm0 ;A: w4[i] = (w0[i] < 0 ? -1 : 0);
+ paddw xmm0, xmm4 ;A: w0[i] += w4[i];
+ movaps XMMWORD [t + 0 * SIZEOF_WORD], xmm0 ;A: t[i] = w0[i];
+
+ movq xmm2, qword [block + 24 * SIZEOF_WORD] ;B: w2 = 24 25 26 27 -- -- -- --
+ pshuflw xmm2, xmm2, 11011000b ;B: w2 = 24 26 25 27 -- -- -- --
+ pslldq xmm1, 1 * SIZEOF_WORD ;B: w1 = -- 08 09 10 11 04 05 12
+ movups xmm5, XMMWORD [block + 48 * SIZEOF_WORD] ;H: w5 = 48 49 50 51 52 53 54 55
+ movsd xmm1, xmm2 ;B: w1 = 24 26 25 27 11 04 05 12
+ punpcklqdq xmm2, xmm5 ;C: w2 = 24 26 25 27 48 49 50 51
+ pinsrw xmm1, word [block + 32 * SIZEOF_WORD], 1 ;B: w1 = 24 32 25 27 11 04 05 12
+ pxor xmm4, xmm4 ;A: w4[i] = 0;
+ psrldq xmm3, 2 * SIZEOF_WORD ;D: w3 = 12 13 06 07 14 15 -- --
+ pcmpeqw xmm0, xmm4 ;A: w0[i] = (w0[i] == 0 ? -1 : 0);
+ pinsrw xmm1, word [block + 18 * SIZEOF_WORD], 3 ;B: w1 = 24 32 25 18 11 04 05 12
+ ; (Row 1, offset 1)
+ pcmpgtw xmm4, xmm1 ;B: w4[i] = (w1[i] < 0 ? -1 : 0);
+ paddw xmm1, xmm4 ;B: w1[i] += w4[i];
+ movaps XMMWORD [t + 8 * SIZEOF_WORD], xmm1 ;B: t[i+8] = w1[i];
+ pxor xmm4, xmm4 ;B: w4[i] = 0;
+ pcmpeqw xmm1, xmm4 ;B: w1[i] = (w1[i] == 0 ? -1 : 0);
+
+ packsswb xmm0, xmm1 ;AB: b0[i] = w0[i], b0[i+8] = w1[i]
+ ; w/ signed saturation
+
+ pinsrw xmm3, word [block + 20 * SIZEOF_WORD], 0 ;D: w3 = 20 13 06 07 14 15 -- --
+ pinsrw xmm3, word [block + 21 * SIZEOF_WORD], 5 ;D: w3 = 20 13 06 07 14 21 -- --
+ pinsrw xmm3, word [block + 28 * SIZEOF_WORD], 6 ;D: w3 = 20 13 06 07 14 21 28 --
+ pinsrw xmm3, word [block + 35 * SIZEOF_WORD], 7 ;D: w3 = 20 13 06 07 14 21 28 35
+ ; (Row 3, offset 1)
+ pcmpgtw xmm4, xmm3 ;D: w4[i] = (w3[i] < 0 ? -1 : 0);
+ paddw xmm3, xmm4 ;D: w3[i] += w4[i];
+ movaps XMMWORD [t + 24 * SIZEOF_WORD], xmm3 ;D: t[i+24] = w3[i];
+ pxor xmm4, xmm4 ;D: w4[i] = 0;
+ pcmpeqw xmm3, xmm4 ;D: w3[i] = (w3[i] == 0 ? -1 : 0);
+
+ pinsrw xmm2, word [block + 19 * SIZEOF_WORD], 0 ;C: w2 = 19 26 25 27 48 49 50 51
+ cmp code, 1 << 31 ;Z: Set CF if code < 0x80000000,
+ ;Z: i.e. if code is positive
+ pinsrw xmm2, word [block + 33 * SIZEOF_WORD], 2 ;C: w2 = 19 26 33 27 48 49 50 51
+ pinsrw xmm2, word [block + 40 * SIZEOF_WORD], 3 ;C: w2 = 19 26 33 40 48 49 50 51
+ adc code, -1 ;Z: code += -1 + (code >= 0 ? 1 : 0);
+ pinsrw xmm2, word [block + 41 * SIZEOF_WORD], 5 ;C: w2 = 19 26 33 40 48 41 50 51
+ pinsrw xmm2, word [block + 34 * SIZEOF_WORD], 6 ;C: w2 = 19 26 33 40 48 41 34 51
+ movsxd codeq, code ;Z: sign extend code
+ pinsrw xmm2, word [block + 27 * SIZEOF_WORD], 7 ;C: w2 = 19 26 33 40 48 41 34 27
+ ; (Row 2, offset 1)
+ pcmpgtw xmm4, xmm2 ;C: w4[i] = (w2[i] < 0 ? -1 : 0);
+ paddw xmm2, xmm4 ;C: w2[i] += w4[i];
+ movaps XMMWORD [t + 16 * SIZEOF_WORD], xmm2 ;C: t[i+16] = w2[i];
+ pxor xmm4, xmm4 ;C: w4[i] = 0;
+ pcmpeqw xmm2, xmm4 ;C: w2[i] = (w2[i] == 0 ? -1 : 0);
+
+ packsswb xmm2, xmm3 ;CD: b2[i] = w2[i], b2[i+8] = w3[i]
+ ; w/ signed saturation
+
+ movzx nbitsq, byte [NBITS(codeq)] ;Z: nbits = JPEG_NBITS(code);
+ movdqa xmm3, xmm5 ;H: w3 = 48 49 50 51 52 53 54 55
+ pmovmskb tempd, xmm2 ;Z: temp = 0; temp |= ((b2[i] >> 7) << i);
+ pmovmskb put_bufferd, xmm0 ;Z: put_buffer = 0; put_buffer |= ((b0[i] >> 7) << i);
+ movups xmm0, XMMWORD [block + 56 * SIZEOF_WORD] ;H: w0 = 56 57 58 59 60 61 62 63
+ punpckhdq xmm3, xmm0 ;H: w3 = 52 53 60 61 54 55 62 63
+ shl tempd, 16 ;Z: temp <<= 16;
+ psrldq xmm3, 1 * SIZEOF_WORD ;H: w3 = 53 60 61 54 55 62 63 --
+ pxor xmm2, xmm2 ;H: w2[i] = 0;
+ or put_bufferd, tempd ;Z: put_buffer |= temp;
+ pshuflw xmm3, xmm3, 00111001b ;H: w3 = 60 61 54 53 55 62 63 --
+ movq xmm1, qword [block + 44 * SIZEOF_WORD] ;G: w1 = 44 45 46 47 -- -- -- --
+ unpcklps xmm5, xmm0 ;E: w5 = 48 49 56 57 50 51 58 59
+ pxor xmm0, xmm0 ;H: w0[i] = 0;
+ pinsrw xmm3, word [block + 47 * SIZEOF_WORD], 3 ;H: w3 = 60 61 54 47 55 62 63 --
+ ; (Row 7, offset 1)
+ pcmpgtw xmm2, xmm3 ;H: w2[i] = (w3[i] < 0 ? -1 : 0);
+ paddw xmm3, xmm2 ;H: w3[i] += w2[i];
+ movaps XMMWORD [t + 56 * SIZEOF_WORD], xmm3 ;H: t[i+56] = w3[i];
+ movq xmm4, qword [block + 36 * SIZEOF_WORD] ;G: w4 = 36 37 38 39 -- -- -- --
+ pcmpeqw xmm3, xmm0 ;H: w3[i] = (w3[i] == 0 ? -1 : 0);
+ punpckldq xmm4, xmm1 ;G: w4 = 36 37 44 45 38 39 46 47
+ mov tempd, [dctbl + c_derived_tbl.ehufco + nbitsq * 4]
+ ;Z: temp = dctbl->ehufco[nbits];
+ movdqa xmm1, xmm4 ;F: w1 = 36 37 44 45 38 39 46 47
+ psrldq xmm4, 1 * SIZEOF_WORD ;G: w4 = 37 44 45 38 39 46 47 --
+ shufpd xmm1, xmm5, 10b ;F: w1 = 36 37 44 45 50 51 58 59
+ and code, dword [MASK_BITS(nbitsq)] ;Z: code &= (1 << nbits) - 1;
+ pshufhw xmm4, xmm4, 11010011b ;G: w4 = 37 44 45 38 -- 39 46 --
+ pslldq xmm1, 1 * SIZEOF_WORD ;F: w1 = -- 36 37 44 45 50 51 58
+ shl tempq, nbitsb ;Z: temp <<= nbits;
+ pinsrw xmm4, word [block + 59 * SIZEOF_WORD], 0 ;G: w4 = 59 44 45 38 -- 39 46 --
+ pshufd xmm1, xmm1, 11011000b ;F: w1 = -- 36 45 50 37 44 51 58
+ pinsrw xmm4, word [block + 52 * SIZEOF_WORD], 1 ;G: w4 = 59 52 45 38 -- 39 46 --
+ or code, tempd ;Z: code |= temp;
+ movlps xmm1, qword [block + 20 * SIZEOF_WORD] ;F: w1 = 20 21 22 23 37 44 51 58
+ pinsrw xmm4, word [block + 31 * SIZEOF_WORD], 4 ;G: w4 = 59 52 45 38 31 39 46 --
+ pshuflw xmm1, xmm1, 01110010b ;F: w1 = 22 20 23 21 37 44 51 58
+ pinsrw xmm4, word [block + 53 * SIZEOF_WORD], 7 ;G: w4 = 59 52 45 38 31 39 46 53
+ ; (Row 6, offset 1)
+ pxor xmm2, xmm2 ;G: w2[i] = 0;
+ pcmpgtw xmm0, xmm4 ;G: w0[i] = (w4[i] < 0 ? -1 : 0);
+ pinsrw xmm1, word [block + 15 * SIZEOF_WORD], 1 ;F: w1 = 22 15 23 21 37 44 51 58
+ paddw xmm4, xmm0 ;G: w4[i] += w0[i];
+ movaps XMMWORD [t + 48 * SIZEOF_WORD], xmm4 ;G: t[48+i] = w4[i];
+ pinsrw xmm1, word [block + 30 * SIZEOF_WORD], 3 ;F: w1 = 22 15 23 30 37 44 51 58
+ ; (Row 5, offset 1)
+ pcmpeqw xmm4, xmm2 ;G: w4[i] = (w4[i] == 0 ? -1 : 0);
+ pinsrw xmm5, word [block + 42 * SIZEOF_WORD], 0 ;E: w5 = 42 49 56 57 50 51 58 59
+
+ packsswb xmm4, xmm3 ;GH: b4[i] = w4[i], b4[i+8] = w3[i]
+ ; w/ signed saturation
+
+ pxor xmm0, xmm0 ;F: w0[i] = 0;
+ pinsrw xmm5, word [block + 43 * SIZEOF_WORD], 5 ;E: w5 = 42 49 56 57 50 43 58 59
+ pcmpgtw xmm2, xmm1 ;F: w2[i] = (w1[i] < 0 ? -1 : 0);
+ pmovmskb tempd, xmm4 ;Z: temp = 0; temp |= ((b4[i] >> 7) << i);
+ pinsrw xmm5, word [block + 36 * SIZEOF_WORD], 6 ;E: w5 = 42 49 56 57 50 43 36 59
+ paddw xmm1, xmm2 ;F: w1[i] += w2[i];
+ movaps XMMWORD [t + 40 * SIZEOF_WORD], xmm1 ;F: t[40+i] = w1[i];
+ pinsrw xmm5, word [block + 29 * SIZEOF_WORD], 7 ;E: w5 = 42 49 56 57 50 43 36 29
+ ; (Row 4, offset 1)
+%undef block
+%define free_bitsq rdx
+%define free_bitsd edx
+%define free_bitsb dl
+ pcmpeqw xmm1, xmm0 ;F: w1[i] = (w1[i] == 0 ? -1 : 0);
+ shl tempq, 48 ;Z: temp <<= 48;
+ pxor xmm2, xmm2 ;E: w2[i] = 0;
+ pcmpgtw xmm0, xmm5 ;E: w0[i] = (w5[i] < 0 ? -1 : 0);
+ paddw xmm5, xmm0 ;E: w5[i] += w0[i];
+ or tempq, put_buffer ;Z: temp |= put_buffer;
+ movaps XMMWORD [t + 32 * SIZEOF_WORD], xmm5 ;E: t[32+i] = w5[i];
+ lea t, [dword t - 2] ;Z: t = &t[-1];
+ pcmpeqw xmm5, xmm2 ;E: w5[i] = (w5[i] == 0 ? -1 : 0);
+
+ packsswb xmm5, xmm1 ;EF: b5[i] = w5[i], b5[i+8] = w1[i]
+ ; w/ signed saturation
+
+ add nbitsb, byte [dctbl + c_derived_tbl.ehufsi + nbitsq]
+ ;Z: nbits += dctbl->ehufsi[nbits];
+%undef dctbl
+%define code_temp r8d
+ pmovmskb indexd, xmm5 ;Z: index = 0; index |= ((b5[i] >> 7) << i);
+ mov free_bitsd, [state+working_state.cur.free_bits]
+ ;Z: free_bits = state->cur.free_bits;
+ pcmpeqw xmm1, xmm1 ;Z: b1[i] = 0xFF;
+ shl index, 32 ;Z: index <<= 32;
+ mov put_buffer, [state+working_state.cur.put_buffer.simd]
+ ;Z: put_buffer = state->cur.put_buffer.simd;
+ or index, tempq ;Z: index |= temp;
+ not index ;Z: index = ~index;
+ sub free_bitsb, nbitsb ;Z: if ((free_bits -= nbits) >= 0)
+ jnl .ENTRY_SKIP_EMIT_CODE ;Z: goto .ENTRY_SKIP_EMIT_CODE;
+ align 16
+.EMIT_CODE: ;Z: .EMIT_CODE:
+ EMIT_QWORD .BLOOP_COND ;Z: insert code, flush buffer, goto .BLOOP_COND
+
+; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ align 16
+.BRLOOP: ; do {
+ lea code_temp, [nbitsq - 16] ; code_temp = nbits - 16;
+ movzx nbits, byte [actbl + c_derived_tbl.ehufsi + 0xf0]
+ ; nbits = actbl->ehufsi[0xf0];
+ mov code, [actbl + c_derived_tbl.ehufco + 0xf0 * 4]
+ ; code = actbl->ehufco[0xf0];
+ sub free_bitsb, nbitsb ; if ((free_bits -= nbits) <= 0)
+ jle .EMIT_BRLOOP_CODE ; goto .EMIT_BRLOOP_CODE;
+ shl put_buffer, nbitsb ; put_buffer <<= nbits;
+ mov nbits, code_temp ; nbits = code_temp;
+ or put_buffer, codeq ; put_buffer |= code;
+ cmp nbits, 16 ; if (nbits <= 16)
+ jle .ERLOOP ; break;
+ jmp .BRLOOP ; } while (1);
+
+; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ align 16
+ times 5 nop
+.ENTRY_SKIP_EMIT_CODE: ; .ENTRY_SKIP_EMIT_CODE:
+ shl put_buffer, nbitsb ; put_buffer <<= nbits;
+ or put_buffer, codeq ; put_buffer |= code;
+.BLOOP_COND: ; .BLOOP_COND:
+ test index, index ; if (index != 0)
+ jz .ELOOP ; {
+.BLOOP: ; do {
+ xor nbits, nbits ; nbits = 0; /* kill tzcnt input dependency */
+ tzcnt nbitsq, index ; nbits = # of trailing 0 bits in index
+ inc nbits ; ++nbits;
+ lea t, [t + nbitsq * 2] ; t = &t[nbits];
+ shr index, nbitsb ; index >>= nbits;
+.EMIT_BRLOOP_CODE_END: ; .EMIT_BRLOOP_CODE_END:
+ cmp nbits, 16 ; if (nbits > 16)
+ jg .BRLOOP ; goto .BRLOOP;
+.ERLOOP: ; .ERLOOP:
+ movsx codeq, word [t] ; code = *t;
+ lea tempd, [nbitsq * 2] ; temp = nbits * 2;
+ movzx nbits, byte [NBITS(codeq)] ; nbits = JPEG_NBITS(code);
+ lea tempd, [nbitsq + tempq * 8] ; temp = temp * 8 + nbits;
+ mov code_temp, [actbl + c_derived_tbl.ehufco + (tempq - 16) * 4]
+ ; code_temp = actbl->ehufco[temp-16];
+ shl code_temp, nbitsb ; code_temp <<= nbits;
+ and code, dword [MASK_BITS(nbitsq)] ; code &= (1 << nbits) - 1;
+ add nbitsb, [actbl + c_derived_tbl.ehufsi + (tempq - 16)]
+ ; free_bits -= actbl->ehufsi[temp-16];
+ or code, code_temp ; code |= code_temp;
+ sub free_bitsb, nbitsb ; if ((free_bits -= nbits) <= 0)
+ jle .EMIT_CODE ; goto .EMIT_CODE;
+ shl put_buffer, nbitsb ; put_buffer <<= nbits;
+ or put_buffer, codeq ; put_buffer |= code;
+ test index, index
+ jnz .BLOOP ; } while (index != 0);
+.ELOOP: ; } /* index != 0 */
+ sub td, esp ; t -= (WIN64: &t_[0], UNIX: &t_[64]);
+%ifdef WIN64
+ cmp td, (DCTSIZE2 - 2) * SIZEOF_WORD ; if (t != 62)
+%else
+ cmp td, -2 * SIZEOF_WORD ; if (t != -2)
+%endif
+ je .EFN ; {
+ movzx nbits, byte [actbl + c_derived_tbl.ehufsi + 0]
+ ; nbits = actbl->ehufsi[0];
+ mov code, [actbl + c_derived_tbl.ehufco + 0] ; code = actbl->ehufco[0];
+ sub free_bitsb, nbitsb ; if ((free_bits -= nbits) <= 0)
+ jg .EFN_SKIP_EMIT_CODE ; {
+ EMIT_QWORD .EFN ; insert code, flush buffer
+ align 16
+.EFN_SKIP_EMIT_CODE: ; } else {
+ shl put_buffer, nbitsb ; put_buffer <<= nbits;
+ or put_buffer, codeq ; put_buffer |= code;
+.EFN: ; } }
+ mov [state + working_state.cur.put_buffer.simd], put_buffer
+ ; state->cur.put_buffer.simd = put_buffer;
+ mov byte [state + working_state.cur.free_bits], free_bitsb
+ ; state->cur.free_bits = free_bits;
+%ifdef WIN64
+ sub rsp, -DCTSIZE2 * SIZEOF_WORD
+ pop r12
+ pop rdi
+ pop rsi
+ pop rbp
+ pop rbx
+%else
+ pop r12
+ pop rbp
+ pop rbx
+%endif
+ ret
+
+; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+ align 16
+.EMIT_BRLOOP_CODE:
+ EMIT_QWORD .EMIT_BRLOOP_CODE_END, { mov nbits, code_temp }
+ ; insert code, flush buffer,
+ ; nbits = code_temp, goto .EMIT_BRLOOP_CODE_END
+
+; For some reason, the OS X linker does not honor the request to align the
+; segment unless we do this.
+ align 32