57 lines
2.7 KiB
ArmAsm
57 lines
2.7 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.source __FILE__
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/ Thompson-Pike Decoder Ring.
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/
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/ The IA-32 BSR instruction can be used to turn a 32-bit
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/ number into an index for this table.
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/
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/ @see libc/str/internal.h
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.rodata
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.align 2
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kTpDecoderRing:
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.rept 7 # MSB≤6 (0x7F)
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.byte 0b00000000,1 # mark,len
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/ 0b11000000 # mask
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.endr
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.rept 4 # MSB≤10 (0x7FF)
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.byte 0b11000000,2 # mark,len
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/ 0b11100000 # mask
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.endr
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.rept 5 # MSB≤15 (0xFFFF)
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.byte 0b11100000,3 # mark,len
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/ 0b11110000 # mask
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.endr
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.rept 5 # MSB≤20 (0x1FFFFF)
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.byte 0b11110000,4 # mark,len
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/ 0b11111000 # mask
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.endr
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.rept 5 # MSB≤25 (0x3FFFFFF)
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.byte 0b11111000,5 # mark,len
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/ 0b11111100 # mask
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.endr
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.rept 6 # MSB≤31 (0xffffffff)
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.byte 0b11111100,6 # mark,len
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.endr
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.endobj kTpDecoderRing,globl,hidden
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.previous
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