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;
; jchuff-sse2.asm - Huffman entropy encoding (SSE2)
;
; Copyright (C) 2009-2011, 2014-2017, 2019, 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
GLOBAL_DATA(jconst_huff_encode_one_block)
EXTN(jconst_huff_encode_one_block):
alignz 32
jpeg_mask_bits dq 0x0000, 0x0001, 0x0003, 0x0007
dq 0x000f, 0x001f, 0x003f, 0x007f
dq 0x00ff, 0x01ff, 0x03ff, 0x07ff
dq 0x0fff, 0x1fff, 0x3fff, 0x7fff
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
alignz 32
%ifdef PIC
%define NBITS(x) nbits_base + x
%else
%define NBITS(x) jpeg_nbits_table + x
%endif
%define MASK_BITS(x) NBITS((x) * 8) + (jpeg_mask_bits - jpeg_nbits_table)
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
%define mm_put_buffer mm0
%define mm_all_0xff mm1
%define mm_temp mm2
%define mm_nbits mm3
%define mm_code_bits mm3
%define mm_code mm4
%define mm_overflow_bits mm5
%define mm_save_nbits mm6
; 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, or
; mmN treated as eight unsigned 8-bit values
; bN[i]: perform the same operation on all unsigned 8-bit values,
; i=0..15 (SSE register) or i=0..7 (MMX register)
; 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 - temp register
; %2 - low byte of temp register
; %3 - second byte of temp register
; %4-%8 (optional) - extra instructions to execute before the macro completes
; %9 - the label to which to jump when the macro completes
;
; 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 9
%define %%temp %1
%define %%tempb %2
%define %%temph %3
add nbits, free_bits ; nbits += free_bits;
neg free_bits ; free_bits = -free_bits;
movq mm_temp, mm_code ; temp = code;
movd mm_nbits, nbits ; nbits --> MMX register
movd mm_overflow_bits, free_bits ; overflow_bits (temp register) = free_bits;
neg free_bits ; free_bits = -free_bits;
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
psrlq mm_temp, mm_overflow_bits ; temp >>= overflow_bits;
add free_bits, 64 ; free_bits += 64;
por mm_temp, mm_put_buffer ; temp |= put_buffer;
%ifidn %%temp, nbits_base
movd mm_save_nbits, nbits_base ; save nbits_base
%endif
movq mm_code_bits, mm_temp ; code_bits (temp register) = temp;
movq mm_put_buffer, mm_code ; put_buffer = code;
pcmpeqb mm_temp, mm_all_0xff ; b_temp[i] = (b_temp[i] == 0xFF ? 0xFF : 0);
movq mm_code, mm_code_bits ; code = code_bits;
psrlq mm_code_bits, 32 ; code_bits >>= 32;
pmovmskb nbits, mm_temp ; nbits = 0; nbits |= ((b_temp[i] >> 7) << i);
movd %%temp, mm_code_bits ; temp = code_bits;
bswap %%temp ; temp = htonl(temp);
test nbits, nbits ; if (nbits != 0) /* Some 0xFF bytes */
jnz %%.SLOW ; goto %%.SLOW
mov dword [buffer], %%temp ; *(uint32_t)buffer = temp;
%ifidn %%temp, nbits_base
movd nbits_base, mm_save_nbits ; restore nbits_base
%endif
%4
movd nbits, mm_code ; nbits = (uint32_t)(code);
%5
bswap nbits ; nbits = htonl(nbits);
mov dword [buffer + 4], nbits ; *(uint32_t)(buffer + 4) = nbits;
lea buffer, [buffer + 8] ; buffer += 8;
%6
%7
%8
jmp %9 ; return
%%.SLOW:
; Execute the equivalent of the EMIT_BYTE() macro in jchuff.c for all 8
; bytes in the qword.
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 buffer, -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 buffer, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
shr %%temp, 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 buffer, -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 buffer, -2 ; buffer -= (-2 + (temp[1] < 0xFF ? 1 : 0));
movd nbits, mm_code ; nbits (temp register) = (uint32_t)(code)
%ifidn %%temp, nbits_base
movd nbits_base, mm_save_nbits ; restore nbits_base
%endif
bswap nbits ; nbits = htonl(nbits)
mov byte [buffer], nbitsb ; buffer[0] = nbits[0];
cmp nbitsb, 0xFF ; Set CF if nbits[0] < 0xFF
mov byte [buffer+1], 0 ; buffer[1] = 0;
sbb buffer, -2 ; buffer -= (-2 + (nbits[0] < 0xFF ? 1 : 0));
mov byte [buffer], nbitsh ; buffer[0] = nbits[1];
cmp nbitsh, 0xFF ; Set CF if nbits[1] < 0xFF
mov byte [buffer+1], 0 ; buffer[1] = 0;
sbb buffer, -2 ; buffer -= (-2 + (nbits[1] < 0xFF ? 1 : 0));
shr nbits, 16 ; nbits >>= 16;
mov byte [buffer], nbitsb ; buffer[0] = nbits[0];
cmp nbitsb, 0xFF ; Set CF if nbits[0] < 0xFF
mov byte [buffer+1], 0 ; buffer[1] = 0;
sbb buffer, -2 ; buffer -= (-2 + (nbits[0] < 0xFF ? 1 : 0));
mov byte [buffer], nbitsh ; buffer[0] = nbits[1];
%4
cmp nbitsh, 0xFF ; Set CF if nbits[1] < 0xFF
mov byte [buffer+1], 0 ; buffer[1] = 0;
sbb buffer, -2 ; buffer -= (-2 + (nbits[1] < 0xFF ? 1 : 0));
%5
%6
%7
%8
jmp %9 ; return;
%endmacro
%macro PUSH 1
push %1
%assign stack_offset stack_offset + 4
%endmacro
%macro POP 1
pop %1
%assign stack_offset stack_offset - 4
%endmacro
; If PIC is defined, load the address of a symbol defined in this file into a
; register. Equivalent to
; get_GOT %1
; lea %1, [GOTOFF(%1, %2)]
; without using the GOT.
;
; Usage:
; %1 - register into which to load the address of the symbol
; %2 - symbol whose address should be loaded
; %3 - optional multi-line macro to execute before the symbol address is loaded
; %4 - optional multi-line macro to execute after the symbol address is loaded
;
; If PIC is not defined, then %3 and %4 are executed in order.
%macro GET_SYM 2-4
%ifdef PIC
call %%.geteip
%%.ref:
%4
add %1, %2 - %%.ref
jmp short %%.done
align 32
%%.geteip:
%3 4 ; must adjust stack pointer because of call
mov %1, POINTER [esp]
ret
align 32
%%.done:
%else
%3 0
%4
%endif
%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)
;
; Stack layout:
; Function args
; Return address
; Saved ebx
; Saved ebp
; Saved esi
; Saved edi <-- esp_save
; ...
; esp_save
; t_ 64*2 bytes (aligned to 128 bytes)
;
; esp is used (as t) to point into t_ (data in lower indices is not used once
; esp passes over them, so this is signal-safe.) Aligning to 128 bytes allows
; us to find the rest of the data again.
;
; 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
; eax - frame --> buffer
; ebx - nbits_base (PIC) / emit_temp
; ecx - dctbl --> size --> state
; edx - block --> nbits
; esi - code_temp --> state --> actbl
; edi - index_temp --> free_bits
; esp - t
; ebp - index
%define frame eax
%ifdef PIC
%define nbits_base ebx
%endif
%define emit_temp ebx
%define emit_tempb bl
%define emit_temph bh
%define dctbl ecx
%define block edx
%define code_temp esi
%define index_temp edi
%define t esp
%define index ebp
%assign save_frame DCTSIZE2 * SIZEOF_WORD
; 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):
%assign stack_offset 0
%define arg_state 4 + stack_offset
%define arg_buffer 8 + stack_offset
%define arg_block 12 + stack_offset
%define arg_last_dc_val 16 + stack_offset
%define arg_dctbl 20 + stack_offset
%define arg_actbl 24 + stack_offset
;X: X = code stream
mov block, [esp + arg_block]
PUSH ebx
PUSH ebp
movups xmm3, XMMWORD [block + 0 * SIZEOF_WORD] ;D: w3 = xx 01 02 03 04 05 06 07
PUSH esi
PUSH edi
movdqa xmm0, xmm3 ;A: w0 = xx 01 02 03 04 05 06 07
mov frame, esp
lea t, [frame - (save_frame + 4)]
movups xmm1, XMMWORD [block + 8 * SIZEOF_WORD] ;B: w1 = 08 09 10 11 12 13 14 15
and t, -DCTSIZE2 * SIZEOF_WORD ; t = &t_[0]
mov [t + save_frame], frame
pxor xmm4, xmm4 ;A: w4[i] = 0;
punpckldq xmm0, xmm1 ;A: w0 = xx 01 08 09 02 03 10 11
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
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
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
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];
movsx code_temp, word [block] ;Z: code_temp = block[0];
; %1 - stack pointer adjustment
%macro GET_SYM_BEFORE 1
movaps XMMWORD [t + 16 * SIZEOF_WORD + %1], 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);
sub code_temp, [frame + arg_last_dc_val] ;Z: code_temp -= last_dc_val;
packsswb xmm2, xmm3 ;CD: b2[i] = w2[i], b2[i+8] = w3[i]
; w/ signed saturation
movdqa xmm3, xmm5 ;H: w3 = 48 49 50 51 52 53 54 55
pmovmskb index_temp, xmm2 ;Z: index_temp = 0; index_temp |= ((b2[i] >> 7) << i);
pmovmskb index, xmm0 ;Z: index = 0; index |= ((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 index_temp, 16 ;Z: index_temp <<= 16;
psrldq xmm3, 1 * SIZEOF_WORD ;H: w3 = 53 60 61 54 55 62 63 --
pxor xmm2, xmm2 ;H: w2[i] = 0;
pshuflw xmm3, xmm3, 00111001b ;H: w3 = 60 61 54 53 55 62 63 --
or index, index_temp ;Z: index |= index_temp;
%undef index_temp
%define free_bits edi
%endmacro
%macro GET_SYM_AFTER 0
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;
not index ;Z: index = ~index;
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);
mov dctbl, [frame + arg_dctbl]
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
movdqa xmm1, xmm4 ;F: w1 = 36 37 44 45 38 39 46 47
pcmpeqw mm_all_0xff, mm_all_0xff ;Z: all_0xff[i] = 0xFF;
%endmacro
GET_SYM nbits_base, jpeg_nbits_table, GET_SYM_BEFORE, GET_SYM_AFTER
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
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
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
cmp code_temp, 1 << 31 ;Z: Set CF if code_temp < 0x80000000,
;Z: i.e. if code_temp is positive
pinsrw xmm4, word [block + 52 * SIZEOF_WORD], 1 ;G: w4 = 59 52 45 38 -- 39 46 --
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)
adc code_temp, -1 ;Z: code_temp += -1 + (code_temp >= 0 ? 1 : 0);
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];
movd mm_temp, code_temp ;Z: temp = code_temp
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);
packsswb xmm4, xmm3 ;GH: b4[i] = w4[i], b4[i+8] = w3[i]
; w/ signed saturation
lea t, [t - SIZEOF_WORD] ;Z: t = &t[-1]
pxor xmm0, xmm0 ;F: w0[i] = 0;
pcmpgtw xmm2, xmm1 ;F: w2[i] = (w1[i] < 0 ? -1 : 0);
paddw xmm1, xmm2 ;F: w1[i] += w2[i];
movaps XMMWORD [t + (40+1) * SIZEOF_WORD], xmm1 ;F: t[40+i] = w1[i];
pcmpeqw xmm1, xmm0 ;F: w1[i] = (w1[i] == 0 ? -1 : 0);
pinsrw xmm5, word [block + 42 * SIZEOF_WORD], 0 ;E: w5 = 42 49 56 57 50 51 58 59
pinsrw xmm5, word [block + 43 * SIZEOF_WORD], 5 ;E: w5 = 42 49 56 57 50 43 58 59
pinsrw xmm5, word [block + 36 * SIZEOF_WORD], 6 ;E: w5 = 42 49 56 57 50 43 36 59
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 nbits edx
%define nbitsb dl
%define nbitsh dh
movzx nbits, byte [NBITS(code_temp)] ;Z: nbits = JPEG_NBITS(code_temp);
%undef code_temp
%define state esi
pxor xmm2, xmm2 ;E: w2[i] = 0;
mov state, [frame + arg_state]
movd mm_nbits, nbits ;Z: nbits --> MMX register
pcmpgtw xmm0, xmm5 ;E: w0[i] = (w5[i] < 0 ? -1 : 0);
movd mm_code, dword [dctbl + c_derived_tbl.ehufco + nbits * 4]
;Z: code = dctbl->ehufco[nbits];
%define size ecx
%define sizeb cl
%define sizeh ch
paddw xmm5, xmm0 ;E: w5[i] += w0[i];
movaps XMMWORD [t + (32+1) * SIZEOF_WORD], xmm5 ;E: t[32+i] = w5[i];
movzx size, byte [dctbl + c_derived_tbl.ehufsi + nbits]
;Z: size = dctbl->ehufsi[nbits];
%undef dctbl
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
movq mm_put_buffer, [state + working_state.cur.put_buffer.simd]
;Z: put_buffer = state->cur.put_buffer.simd;
mov free_bits, [state + working_state.cur.free_bits]
;Z: free_bits = state->cur.free_bits;
%undef state
%define actbl esi
mov actbl, [frame + arg_actbl]
%define buffer eax
mov buffer, [frame + arg_buffer]
%undef frame
jmp .BEGIN
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
; size <= 32, so this is not really a loop
.BRLOOP1: ; .BRLOOP1:
movzx nbits, byte [actbl + c_derived_tbl.ehufsi + 0xf0]
; nbits = actbl->ehufsi[0xf0];
movd mm_code, dword [actbl + c_derived_tbl.ehufco + 0xf0 * 4]
; code = actbl->ehufco[0xf0];
and index, 0x7ffffff ; clear index if size == 32
sub size, 16 ; size -= 16;
sub free_bits, nbits ; if ((free_bits -= nbits) <= 0)
jle .EMIT_BRLOOP1 ; goto .EMIT_BRLOOP1;
movd mm_nbits, nbits ; nbits --> MMX register
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
por mm_put_buffer, mm_code ; put_buffer |= code;
jmp .ERLOOP1 ; goto .ERLOOP1;
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
%ifdef PIC
times 6 nop
%else
times 2 nop
%endif
.BLOOP1: ; do { /* size = # of zero bits/elements to skip */
; if size == 32, index remains unchanged. Correct in .BRLOOP.
shr index, sizeb ; index >>= size;
lea t, [t + size * SIZEOF_WORD] ; t += size;
cmp size, 16 ; if (size > 16)
jg .BRLOOP1 ; goto .BRLOOP1;
.ERLOOP1: ; .ERLOOP1:
movsx nbits, word [t] ; nbits = *t;
%ifdef PIC
add size, size ; size += size;
%else
lea size, [size * 2] ; size += size;
%endif
movd mm_temp, nbits ; temp = nbits;
movzx nbits, byte [NBITS(nbits)] ; nbits = JPEG_NBITS(nbits);
lea size, [size * 8 + nbits] ; size = size * 8 + nbits;
movd mm_nbits, nbits ; nbits --> MMX register
movd mm_code, dword [actbl + c_derived_tbl.ehufco + (size - 16) * 4]
; code = actbl->ehufco[size-16];
movzx size, byte [actbl + c_derived_tbl.ehufsi + (size - 16)]
; size = actbl->ehufsi[size-16];
.BEGIN: ; .BEGIN:
pand mm_temp, [MASK_BITS(nbits)] ; temp &= (1 << nbits) - 1;
psllq mm_code, mm_nbits ; code <<= nbits;
add nbits, size ; nbits += size;
por mm_code, mm_temp ; code |= temp;
sub free_bits, nbits ; if ((free_bits -= nbits) <= 0)
jle .EMIT_ERLOOP1 ; insert code, flush buffer, init size, goto .BLOOP1
xor size, size ; size = 0; /* kill tzcnt input dependency */
tzcnt size, index ; size = # of trailing 0 bits in index
movd mm_nbits, nbits ; nbits --> MMX register
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
inc size ; ++size;
por mm_put_buffer, mm_code ; put_buffer |= code;
test index, index
jnz .BLOOP1 ; } while (index != 0);
; Round 2
; t points to the last used word, possibly below t_ if the previous index had 32 zero bits.
.ELOOP1: ; .ELOOP1:
pmovmskb size, xmm4 ; size = 0; size |= ((b4[i] >> 7) << i);
pmovmskb index, xmm5 ; index = 0; index |= ((b5[i] >> 7) << i);
shl size, 16 ; size <<= 16;
or index, size ; index |= size;
not index ; index = ~index;
lea nbits, [t + (1 + DCTSIZE2) * SIZEOF_WORD]
; nbits = t + 1 + 64;
and nbits, -DCTSIZE2 * SIZEOF_WORD ; nbits &= -128; /* now points to &t_[64] */
sub nbits, t ; nbits -= t;
shr nbits, 1 ; nbits >>= 1; /* # of leading 0 bits in old index + 33 */
tzcnt size, index ; size = # of trailing 0 bits in index
inc size ; ++size;
test index, index ; if (index == 0)
jz .ELOOP2 ; goto .ELOOP2;
; NOTE: size == 32 cannot happen, since the last element is always 0.
shr index, sizeb ; index >>= size;
lea size, [size + nbits - 33] ; size = size + nbits - 33;
lea t, [t + size * SIZEOF_WORD] ; t += size;
cmp size, 16 ; if (size <= 16)
jle .ERLOOP2 ; goto .ERLOOP2;
.BRLOOP2: ; do {
movzx nbits, byte [actbl + c_derived_tbl.ehufsi + 0xf0]
; nbits = actbl->ehufsi[0xf0];
sub size, 16 ; size -= 16;
movd mm_code, dword [actbl + c_derived_tbl.ehufco + 0xf0 * 4]
; code = actbl->ehufco[0xf0];
sub free_bits, nbits ; if ((free_bits -= nbits) <= 0)
jle .EMIT_BRLOOP2 ; insert code and flush put_buffer
movd mm_nbits, nbits ; else { nbits --> MMX register
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
por mm_put_buffer, mm_code ; put_buffer |= code;
cmp size, 16 ; if (size <= 16)
jle .ERLOOP2 ; goto .ERLOOP2;
jmp .BRLOOP2 ; } while (1);
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
.BLOOP2: ; do { /* size = # of zero bits/elements to skip */
shr index, sizeb ; index >>= size;
lea t, [t + size * SIZEOF_WORD] ; t += size;
cmp size, 16 ; if (size > 16)
jg .BRLOOP2 ; goto .BRLOOP2;
.ERLOOP2: ; .ERLOOP2:
movsx nbits, word [t] ; nbits = *t;
add size, size ; size += size;
movd mm_temp, nbits ; temp = nbits;
movzx nbits, byte [NBITS(nbits)] ; nbits = JPEG_NBITS(nbits);
movd mm_nbits, nbits ; nbits --> MMX register
lea size, [size * 8 + nbits] ; size = size * 8 + nbits;
movd mm_code, dword [actbl + c_derived_tbl.ehufco + (size - 16) * 4]
; code = actbl->ehufco[size-16];
movzx size, byte [actbl + c_derived_tbl.ehufsi + (size - 16)]
; size = actbl->ehufsi[size-16];
psllq mm_code, mm_nbits ; code <<= nbits;
pand mm_temp, [MASK_BITS(nbits)] ; temp &= (1 << nbits) - 1;
lea nbits, [nbits + size] ; nbits += size;
por mm_code, mm_temp ; code |= temp;
xor size, size ; size = 0; /* kill tzcnt input dependency */
sub free_bits, nbits ; if ((free_bits -= nbits) <= 0)
jle .EMIT_ERLOOP2 ; insert code, flush buffer, init size, goto .BLOOP2
tzcnt size, index ; size = # of trailing 0 bits in index
movd mm_nbits, nbits ; nbits --> MMX register
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
inc size ; ++size;
por mm_put_buffer, mm_code ; put_buffer |= code;
test index, index
jnz .BLOOP2 ; } while (index != 0);
.ELOOP2: ; .ELOOP2:
mov nbits, t ; nbits = t;
lea t, [t + SIZEOF_WORD] ; t = &t[1];
and nbits, DCTSIZE2 * SIZEOF_WORD - 1 ; nbits &= 127;
and t, -DCTSIZE2 * SIZEOF_WORD ; t &= -128; /* t = &t_[0]; */
cmp nbits, (DCTSIZE2 - 2) * SIZEOF_WORD ; if (nbits != 62 * 2)
je .EFN ; {
movd mm_code, dword [actbl + c_derived_tbl.ehufco + 0]
; code = actbl->ehufco[0];
movzx nbits, byte [actbl + c_derived_tbl.ehufsi + 0]
; nbits = actbl->ehufsi[0];
sub free_bits, nbits ; if ((free_bits -= nbits) <= 0)
jg .EFN_SKIP_EMIT_CODE ; {
EMIT_QWORD size, sizeb, sizeh, , , , , , .EFN ; insert code, flush put_buffer
align 16
.EFN_SKIP_EMIT_CODE: ; } else {
movd mm_nbits, nbits ; nbits --> MMX register
psllq mm_put_buffer, mm_nbits ; put_buffer <<= nbits;
por mm_put_buffer, mm_code ; put_buffer |= code;
.EFN: ; } }
%define frame esp
mov frame, [t + save_frame]
%define state ecx
mov state, [frame + arg_state]
movq [state + working_state.cur.put_buffer.simd], mm_put_buffer
; state->cur.put_buffer.simd = put_buffer;
emms
mov [state + working_state.cur.free_bits], free_bits
; state->cur.free_bits = free_bits;
POP edi
POP esi
POP ebp
POP ebx
ret
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
.EMIT_BRLOOP1:
EMIT_QWORD emit_temp, emit_tempb, emit_temph, , , , , , \
.ERLOOP1
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
.EMIT_ERLOOP1:
EMIT_QWORD size, sizeb, sizeh, \
{ xor size, size }, \
{ tzcnt size, index }, \
{ inc size }, \
{ test index, index }, \
{ jnz .BLOOP1 }, \
.ELOOP1
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
.EMIT_BRLOOP2:
EMIT_QWORD emit_temp, emit_tempb, emit_temph, , , , \
{ cmp size, 16 }, \
{ jle .ERLOOP2 }, \
.BRLOOP2
; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
align 16
.EMIT_ERLOOP2:
EMIT_QWORD size, sizeb, sizeh, \
{ xor size, size }, \
{ tzcnt size, index }, \
{ inc size }, \
{ test index, index }, \
{ jnz .BLOOP2 }, \
.ELOOP2
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 32