mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-10 19:22:00 -08:00
507 lines
11 KiB
ArmAsm
507 lines
11 KiB
ArmAsm
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// +build !appengine
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// +build gc
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// +build !noasm
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#include "textflag.h"
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#include "funcdata.h"
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#include "go_asm.h"
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#ifdef GOAMD64_v4
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#ifndef GOAMD64_v3
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#define GOAMD64_v3
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#endif
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#endif
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#define bufoff 256 // see decompress.go, we're using [4][256]byte table
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// func decompress4x_main_loop_x86(pbr0, pbr1, pbr2, pbr3 *bitReaderShifted,
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// peekBits uint8, buf *byte, tbl *dEntrySingle) (int, bool)
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TEXT ·decompress4x_main_loop_x86(SB), NOSPLIT, $8
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#define off R8
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#define buffer DI
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#define table SI
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#define br_bits_read R9
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#define br_value R10
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#define br_offset R11
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#define peek_bits R12
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#define exhausted DX
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#define br0 R13
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#define br1 R14
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#define br2 R15
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#define br3 BP
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MOVQ BP, 0(SP)
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XORQ exhausted, exhausted // exhausted = false
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XORQ off, off // off = 0
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MOVBQZX peekBits+32(FP), peek_bits
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MOVQ buf+40(FP), buffer
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MOVQ tbl+48(FP), table
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MOVQ pbr0+0(FP), br0
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MOVQ pbr1+8(FP), br1
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MOVQ pbr2+16(FP), br2
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MOVQ pbr3+24(FP), br3
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main_loop:
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// const stream = 0
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// br0.fillFast()
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MOVBQZX bitReaderShifted_bitsRead(br0), br_bits_read
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MOVQ bitReaderShifted_value(br0), br_value
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MOVQ bitReaderShifted_off(br0), br_offset
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// We must have at least 2 * max tablelog left
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CMPQ br_bits_read, $64-22
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JBE skip_fill0
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SUBQ $32, br_bits_read // b.bitsRead -= 32
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SUBQ $4, br_offset // b.off -= 4
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// v := b.in[b.off-4 : b.off]
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// v = v[:4]
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// low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
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MOVQ bitReaderShifted_in(br0), AX
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// b.value |= uint64(low) << (b.bitsRead & 63)
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#ifdef GOAMD64_v3
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SHLXQ br_bits_read, 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4]) << (b.bitsRead & 63)
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#else
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MOVL 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4])
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MOVQ br_bits_read, CX
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SHLQ CL, AX
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#endif
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ORQ AX, br_value
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// exhausted = exhausted || (br0.off < 4)
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CMPQ br_offset, $4
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SETLT DL
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ORB DL, DH
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// }
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skip_fill0:
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// val0 := br0.peekTopBits(peekBits)
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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MOVQ br_value, AX
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MOVQ peek_bits, CX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v0 := table[val0&mask]
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MOVW 0(table)(AX*2), AX // AX - v0
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// br0.advance(uint8(v0.entry))
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MOVB AH, BL // BL = uint8(v0.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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// val1 := br0.peekTopBits(peekBits)
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MOVQ peek_bits, CX
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MOVQ br_value, AX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v1 := table[val1&mask]
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MOVW 0(table)(AX*2), AX // AX - v1
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// br0.advance(uint8(v1.entry))
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MOVB AH, BH // BH = uint8(v1.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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// these two writes get coalesced
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// buf[stream][off] = uint8(v0.entry >> 8)
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// buf[stream][off+1] = uint8(v1.entry >> 8)
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MOVW BX, 0(buffer)(off*1)
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// update the bitrader reader structure
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MOVB br_bits_read, bitReaderShifted_bitsRead(br0)
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MOVQ br_value, bitReaderShifted_value(br0)
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MOVQ br_offset, bitReaderShifted_off(br0)
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// const stream = 1
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// br1.fillFast()
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MOVBQZX bitReaderShifted_bitsRead(br1), br_bits_read
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MOVQ bitReaderShifted_value(br1), br_value
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MOVQ bitReaderShifted_off(br1), br_offset
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// We must have at least 2 * max tablelog left
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CMPQ br_bits_read, $64-22
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JBE skip_fill1
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SUBQ $32, br_bits_read // b.bitsRead -= 32
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SUBQ $4, br_offset // b.off -= 4
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// v := b.in[b.off-4 : b.off]
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// v = v[:4]
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// low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
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MOVQ bitReaderShifted_in(br1), AX
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// b.value |= uint64(low) << (b.bitsRead & 63)
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#ifdef GOAMD64_v3
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SHLXQ br_bits_read, 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4]) << (b.bitsRead & 63)
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#else
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MOVL 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4])
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MOVQ br_bits_read, CX
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SHLQ CL, AX
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#endif
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ORQ AX, br_value
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// exhausted = exhausted || (br1.off < 4)
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CMPQ br_offset, $4
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SETLT DL
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ORB DL, DH
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// }
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skip_fill1:
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// val0 := br1.peekTopBits(peekBits)
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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MOVQ br_value, AX
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MOVQ peek_bits, CX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v0 := table[val0&mask]
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MOVW 0(table)(AX*2), AX // AX - v0
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// br1.advance(uint8(v0.entry))
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MOVB AH, BL // BL = uint8(v0.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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// val1 := br1.peekTopBits(peekBits)
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MOVQ peek_bits, CX
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MOVQ br_value, AX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v1 := table[val1&mask]
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MOVW 0(table)(AX*2), AX // AX - v1
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// br1.advance(uint8(v1.entry))
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MOVB AH, BH // BH = uint8(v1.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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// these two writes get coalesced
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// buf[stream][off] = uint8(v0.entry >> 8)
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// buf[stream][off+1] = uint8(v1.entry >> 8)
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MOVW BX, 256(buffer)(off*1)
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// update the bitrader reader structure
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MOVB br_bits_read, bitReaderShifted_bitsRead(br1)
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MOVQ br_value, bitReaderShifted_value(br1)
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MOVQ br_offset, bitReaderShifted_off(br1)
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// const stream = 2
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// br2.fillFast()
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MOVBQZX bitReaderShifted_bitsRead(br2), br_bits_read
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MOVQ bitReaderShifted_value(br2), br_value
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MOVQ bitReaderShifted_off(br2), br_offset
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// We must have at least 2 * max tablelog left
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CMPQ br_bits_read, $64-22
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JBE skip_fill2
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SUBQ $32, br_bits_read // b.bitsRead -= 32
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SUBQ $4, br_offset // b.off -= 4
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// v := b.in[b.off-4 : b.off]
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// v = v[:4]
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// low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
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MOVQ bitReaderShifted_in(br2), AX
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// b.value |= uint64(low) << (b.bitsRead & 63)
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#ifdef GOAMD64_v3
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SHLXQ br_bits_read, 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4]) << (b.bitsRead & 63)
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#else
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MOVL 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4])
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MOVQ br_bits_read, CX
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SHLQ CL, AX
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#endif
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ORQ AX, br_value
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// exhausted = exhausted || (br2.off < 4)
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CMPQ br_offset, $4
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SETLT DL
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ORB DL, DH
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// }
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skip_fill2:
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// val0 := br2.peekTopBits(peekBits)
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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MOVQ br_value, AX
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MOVQ peek_bits, CX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v0 := table[val0&mask]
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MOVW 0(table)(AX*2), AX // AX - v0
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// br2.advance(uint8(v0.entry))
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MOVB AH, BL // BL = uint8(v0.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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#ifdef GOAMD64_v3
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SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
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#else
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// val1 := br2.peekTopBits(peekBits)
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MOVQ peek_bits, CX
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MOVQ br_value, AX
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SHRQ CL, AX // AX = (value >> peek_bits) & mask
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#endif
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// v1 := table[val1&mask]
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MOVW 0(table)(AX*2), AX // AX - v1
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// br2.advance(uint8(v1.entry))
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MOVB AH, BH // BH = uint8(v1.entry >> 8)
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#ifdef GOAMD64_v3
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MOVBQZX AL, CX
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SHLXQ AX, br_value, br_value // value <<= n
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#else
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MOVBQZX AL, CX
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SHLQ CL, br_value // value <<= n
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#endif
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ADDQ CX, br_bits_read // bits_read += n
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// these two writes get coalesced
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// buf[stream][off] = uint8(v0.entry >> 8)
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// buf[stream][off+1] = uint8(v1.entry >> 8)
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MOVW BX, 512(buffer)(off*1)
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// update the bitrader reader structure
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MOVB br_bits_read, bitReaderShifted_bitsRead(br2)
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MOVQ br_value, bitReaderShifted_value(br2)
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MOVQ br_offset, bitReaderShifted_off(br2)
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// const stream = 3
|
||
|
|
// br3.fillFast()
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||
|
|
MOVBQZX bitReaderShifted_bitsRead(br3), br_bits_read
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||
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|
MOVQ bitReaderShifted_value(br3), br_value
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||
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MOVQ bitReaderShifted_off(br3), br_offset
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||
|
|
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||
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// We must have at least 2 * max tablelog left
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||
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|
CMPQ br_bits_read, $64-22
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||
|
|
JBE skip_fill3
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||
|
|
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||
|
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SUBQ $32, br_bits_read // b.bitsRead -= 32
|
||
|
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SUBQ $4, br_offset // b.off -= 4
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||
|
|
|
||
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// v := b.in[b.off-4 : b.off]
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||
|
|
// v = v[:4]
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||
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|
// low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
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||
|
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MOVQ bitReaderShifted_in(br3), AX
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||
|
|
|
||
|
|
// b.value |= uint64(low) << (b.bitsRead & 63)
|
||
|
|
#ifdef GOAMD64_v3
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||
|
|
SHLXQ br_bits_read, 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4]) << (b.bitsRead & 63)
|
||
|
|
|
||
|
|
#else
|
||
|
|
MOVL 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4])
|
||
|
|
MOVQ br_bits_read, CX
|
||
|
|
SHLQ CL, AX
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ORQ AX, br_value
|
||
|
|
|
||
|
|
// exhausted = exhausted || (br3.off < 4)
|
||
|
|
CMPQ br_offset, $4
|
||
|
|
SETLT DL
|
||
|
|
ORB DL, DH
|
||
|
|
|
||
|
|
// }
|
||
|
|
skip_fill3:
|
||
|
|
|
||
|
|
// val0 := br3.peekTopBits(peekBits)
|
||
|
|
#ifdef GOAMD64_v3
|
||
|
|
SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
|
||
|
|
|
||
|
|
#else
|
||
|
|
MOVQ br_value, AX
|
||
|
|
MOVQ peek_bits, CX
|
||
|
|
SHRQ CL, AX // AX = (value >> peek_bits) & mask
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// v0 := table[val0&mask]
|
||
|
|
MOVW 0(table)(AX*2), AX // AX - v0
|
||
|
|
|
||
|
|
// br3.advance(uint8(v0.entry))
|
||
|
|
MOVB AH, BL // BL = uint8(v0.entry >> 8)
|
||
|
|
|
||
|
|
#ifdef GOAMD64_v3
|
||
|
|
MOVBQZX AL, CX
|
||
|
|
SHLXQ AX, br_value, br_value // value <<= n
|
||
|
|
|
||
|
|
#else
|
||
|
|
MOVBQZX AL, CX
|
||
|
|
SHLQ CL, br_value // value <<= n
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ADDQ CX, br_bits_read // bits_read += n
|
||
|
|
|
||
|
|
#ifdef GOAMD64_v3
|
||
|
|
SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
|
||
|
|
|
||
|
|
#else
|
||
|
|
// val1 := br3.peekTopBits(peekBits)
|
||
|
|
MOVQ peek_bits, CX
|
||
|
|
MOVQ br_value, AX
|
||
|
|
SHRQ CL, AX // AX = (value >> peek_bits) & mask
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// v1 := table[val1&mask]
|
||
|
|
MOVW 0(table)(AX*2), AX // AX - v1
|
||
|
|
|
||
|
|
// br3.advance(uint8(v1.entry))
|
||
|
|
MOVB AH, BH // BH = uint8(v1.entry >> 8)
|
||
|
|
|
||
|
|
#ifdef GOAMD64_v3
|
||
|
|
MOVBQZX AL, CX
|
||
|
|
SHLXQ AX, br_value, br_value // value <<= n
|
||
|
|
|
||
|
|
#else
|
||
|
|
MOVBQZX AL, CX
|
||
|
|
SHLQ CL, br_value // value <<= n
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ADDQ CX, br_bits_read // bits_read += n
|
||
|
|
|
||
|
|
// these two writes get coalesced
|
||
|
|
// buf[stream][off] = uint8(v0.entry >> 8)
|
||
|
|
// buf[stream][off+1] = uint8(v1.entry >> 8)
|
||
|
|
MOVW BX, 768(buffer)(off*1)
|
||
|
|
|
||
|
|
// update the bitrader reader structure
|
||
|
|
MOVB br_bits_read, bitReaderShifted_bitsRead(br3)
|
||
|
|
MOVQ br_value, bitReaderShifted_value(br3)
|
||
|
|
MOVQ br_offset, bitReaderShifted_off(br3)
|
||
|
|
|
||
|
|
ADDQ $2, off // off += 2
|
||
|
|
|
||
|
|
TESTB DH, DH // any br[i].ofs < 4?
|
||
|
|
JNZ end
|
||
|
|
|
||
|
|
CMPQ off, $bufoff
|
||
|
|
JL main_loop
|
||
|
|
|
||
|
|
end:
|
||
|
|
MOVQ 0(SP), BP
|
||
|
|
|
||
|
|
MOVB off, ret+56(FP)
|
||
|
|
RET
|
||
|
|
|
||
|
|
#undef off
|
||
|
|
#undef buffer
|
||
|
|
#undef table
|
||
|
|
|
||
|
|
#undef br_bits_read
|
||
|
|
#undef br_value
|
||
|
|
#undef br_offset
|
||
|
|
#undef peek_bits
|
||
|
|
#undef exhausted
|
||
|
|
|
||
|
|
#undef br0
|
||
|
|
#undef br1
|
||
|
|
#undef br2
|
||
|
|
#undef br3
|