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decode.hh
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decode.hh
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// Copyright 2015, 2018 Georg Sauthoff <mail@georg.so>
/* {{{ LGPLv3
This file is part of libxfsx.
libxfsx is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
libxfsx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with libxfsx. If not, see <http://www.gnu.org/licenses/>.
}}} */
#ifndef XFSX_BCD_IMPL_DECODE_HH
#define XFSX_BCD_IMPL_DECODE_HH
/*
This file contains functions for converting big-endian binary-coded decimals
(BCD, cf. https://en.wikipedia.org/wiki/Binary-coded_decimal) into
a character string.
The functions are parametrized much to optimally target target different
architectures and being able to easily benchmark different implementation
choices.
The code is layed out from easy/naive to more complicated. Thus, for
didactic purposes it makes sense to read the code sequentially from the top
as the variations on the same theme get more complicated.
Template functions with default template arguments are used
to keep thing generic where sensible. Implementation choices are
guarded by if/switch-statements thus when instantiated the compiler
eliminates some dead code. Some implementation choices can also be
considered as executable documentation, i.e. when a naive implementation
describes the effect of a more complicated one.
There are some comments inline, but see also xfsx/bcd.cc for some
comments regarding some generic pitfalls.
See also test/bcd_speed.cc for running the different variants against
each other (also contains some example results from different
architectures).
*/
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch"
#endif
#include <assert.h>
#include <stdint.h>
#include <limits>
#include <stdlib.h>
#include <boost/endian/conversion.hpp>
#include <xfsx/bcd/util.hh>
#ifdef __BMI2__
#include <x86intrin.h> // _pdep_u64
#endif
#ifdef __SSSE3__
//#include <emmintrin.h> // SSE2
#include <tmmintrin.h> // SSSE3 _mm_shuffle_epi8
#endif
namespace xfsx { namespace bcd { namespace impl { namespace decode {
enum class Type {
BYTEWISE,
// use a lookup table with 256 or 16 entries that maps
// each byte or nibble to 2 or 1 bytes
LOOKUP,
// SIMD within a register
// https://en.wikipedia.org/wiki/SWAR
// e.g. 8 digits in parallel on a 64 bit machine
SWAR,
// Single Instruction Multiple Data
// https://en.wikipedia.org/wiki/SIMD
// e.g. 16 digits in parallel with SSE2
SIMD
};
// note that not all combinations make sense, thus, not all types
// use all values
enum class Scatter {
// SWAR: interleave 4 input bytes with 0s in a loop to distribute the nibbles
// SIMD: use vector instructions (don't actually loop)
LOOP,
// SWAR/SIMD: Bit deposit (i.e. scatter) from a 64 bit source
// cf. https://en.wikipedia.org/wiki/Bit_Manipulation_Instruction_Sets
PDEP
};
enum class Convert {
// Bytewise: use if-statements in the main loop
BRANCH,
// Bytewise: branchfree by creating a mask using normal/bit arithmetic
// SIMD: use element-wise arithmetic for masking
ARITH,
// Bytewise: branchfree by creating a mask using a comparison operator
// SIMD: use shuffle as a lookup table
DIRECT,
// Type Lookup: use small lookup table with only 16 entries
SMALL
};
enum class Gather {
// SWAR: shift bytes into the output
SHIFT,
// SWAR: memcpy + possibly bswap bytes into the output
MEMCPY
};
template <
Convert convert = Convert::DIRECT,
char A = 'a'
> void decode_bytewise(const u8 *begin, const u8 *end, char *o)
{
u8 geq_10_off = u8(A) - u8('0') - 10u; // => 0b10'01'11
// => geq_10_off == 0b10'01'11 if A == 'a' else 0b1'11
for (const u8 *i = begin; i != end; ++i) {
u8 x = *i, hi, lo;
u8 h = x >> 4;
u8 l = x & 0xf;
if (convert == Convert::BRANCH) {
if (h > 9)
hi = h-10 + u8(A);
else
hi = h + '0';
if (l > 9)
lo = l-10 + u8(A);
else
lo = l + u8('0');
} else { // branchless
u8 h_mask;
switch (convert) {
case Convert::ARITH: {
// 54 = 0b0'11'01'10
// 54+9 = 0b0'11'11'11
// 54+10 = 0b1'00'00'00
u8 h_m = (h+54) & 0b1'00'00'00;
h_mask = h_m - (h_m >> 6); // => 0 or 0b11'11'11
} break;
case Convert::DIRECT:
h_mask = -int8_t(h>9); // => 0 or 0b11'11'11'11
break;
}
hi = h + u8('0') + (h_mask & geq_10_off);
u8 l_mask;
switch (convert) {
case Convert::ARITH: {
// useful variant for SAR
u8 l_m = (l+54) & 0b1'00'00'00;
l_mask = l_m - (l_m >> 6);
} break;
case Convert::DIRECT:
l_mask = -int8_t(l>9);
break;
}
lo = l + u8('0') + (l_mask & geq_10_off);
}
*o++ = hi;
*o++ = lo;
}
}
// Generated by mk_bcd_lookup.py
// 2018, Georg Sauthoff <mail@gms.tf>
template <
Convert convert = Convert::DIRECT,
char A = 'a'>
void decode_lookup(const u8* begin, const u8* end, char* o)
{
if (convert == Convert::DIRECT) {
#ifndef __BYTE_ORDER__
#error "__BYTE_ORDER__ macro not defined"
#elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
if (A == 'a') {
static const uint16_t table[] = {
/* 0x00 => */ 0x3030,
/* 0x01 => */ 0x3130,
/* 0x02 => */ 0x3230,
/* 0x03 => */ 0x3330,
/* 0x04 => */ 0x3430,
/* 0x05 => */ 0x3530,
/* 0x06 => */ 0x3630,
/* 0x07 => */ 0x3730,
/* 0x08 => */ 0x3830,
/* 0x09 => */ 0x3930,
/* 0x0a => */ 0x6130,
/* 0x0b => */ 0x6230,
/* 0x0c => */ 0x6330,
/* 0x0d => */ 0x6430,
/* 0x0e => */ 0x6530,
/* 0x0f => */ 0x6630,
/* 0x10 => */ 0x3031,
/* 0x11 => */ 0x3131,
/* 0x12 => */ 0x3231,
/* 0x13 => */ 0x3331,
/* 0x14 => */ 0x3431,
/* 0x15 => */ 0x3531,
/* 0x16 => */ 0x3631,
/* 0x17 => */ 0x3731,
/* 0x18 => */ 0x3831,
/* 0x19 => */ 0x3931,
/* 0x1a => */ 0x6131,
/* 0x1b => */ 0x6231,
/* 0x1c => */ 0x6331,
/* 0x1d => */ 0x6431,
/* 0x1e => */ 0x6531,
/* 0x1f => */ 0x6631,
/* 0x20 => */ 0x3032,
/* 0x21 => */ 0x3132,
/* 0x22 => */ 0x3232,
/* 0x23 => */ 0x3332,
/* 0x24 => */ 0x3432,
/* 0x25 => */ 0x3532,
/* 0x26 => */ 0x3632,
/* 0x27 => */ 0x3732,
/* 0x28 => */ 0x3832,
/* 0x29 => */ 0x3932,
/* 0x2a => */ 0x6132,
/* 0x2b => */ 0x6232,
/* 0x2c => */ 0x6332,
/* 0x2d => */ 0x6432,
/* 0x2e => */ 0x6532,
/* 0x2f => */ 0x6632,
/* 0x30 => */ 0x3033,
/* 0x31 => */ 0x3133,
/* 0x32 => */ 0x3233,
/* 0x33 => */ 0x3333,
/* 0x34 => */ 0x3433,
/* 0x35 => */ 0x3533,
/* 0x36 => */ 0x3633,
/* 0x37 => */ 0x3733,
/* 0x38 => */ 0x3833,
/* 0x39 => */ 0x3933,
/* 0x3a => */ 0x6133,
/* 0x3b => */ 0x6233,
/* 0x3c => */ 0x6333,
/* 0x3d => */ 0x6433,
/* 0x3e => */ 0x6533,
/* 0x3f => */ 0x6633,
/* 0x40 => */ 0x3034,
/* 0x41 => */ 0x3134,
/* 0x42 => */ 0x3234,
/* 0x43 => */ 0x3334,
/* 0x44 => */ 0x3434,
/* 0x45 => */ 0x3534,
/* 0x46 => */ 0x3634,
/* 0x47 => */ 0x3734,
/* 0x48 => */ 0x3834,
/* 0x49 => */ 0x3934,
/* 0x4a => */ 0x6134,
/* 0x4b => */ 0x6234,
/* 0x4c => */ 0x6334,
/* 0x4d => */ 0x6434,
/* 0x4e => */ 0x6534,
/* 0x4f => */ 0x6634,
/* 0x50 => */ 0x3035,
/* 0x51 => */ 0x3135,
/* 0x52 => */ 0x3235,
/* 0x53 => */ 0x3335,
/* 0x54 => */ 0x3435,
/* 0x55 => */ 0x3535,
/* 0x56 => */ 0x3635,
/* 0x57 => */ 0x3735,
/* 0x58 => */ 0x3835,
/* 0x59 => */ 0x3935,
/* 0x5a => */ 0x6135,
/* 0x5b => */ 0x6235,
/* 0x5c => */ 0x6335,
/* 0x5d => */ 0x6435,
/* 0x5e => */ 0x6535,
/* 0x5f => */ 0x6635,
/* 0x60 => */ 0x3036,
/* 0x61 => */ 0x3136,
/* 0x62 => */ 0x3236,
/* 0x63 => */ 0x3336,
/* 0x64 => */ 0x3436,
/* 0x65 => */ 0x3536,
/* 0x66 => */ 0x3636,
/* 0x67 => */ 0x3736,
/* 0x68 => */ 0x3836,
/* 0x69 => */ 0x3936,
/* 0x6a => */ 0x6136,
/* 0x6b => */ 0x6236,
/* 0x6c => */ 0x6336,
/* 0x6d => */ 0x6436,
/* 0x6e => */ 0x6536,
/* 0x6f => */ 0x6636,
/* 0x70 => */ 0x3037,
/* 0x71 => */ 0x3137,
/* 0x72 => */ 0x3237,
/* 0x73 => */ 0x3337,
/* 0x74 => */ 0x3437,
/* 0x75 => */ 0x3537,
/* 0x76 => */ 0x3637,
/* 0x77 => */ 0x3737,
/* 0x78 => */ 0x3837,
/* 0x79 => */ 0x3937,
/* 0x7a => */ 0x6137,
/* 0x7b => */ 0x6237,
/* 0x7c => */ 0x6337,
/* 0x7d => */ 0x6437,
/* 0x7e => */ 0x6537,
/* 0x7f => */ 0x6637,
/* 0x80 => */ 0x3038,
/* 0x81 => */ 0x3138,
/* 0x82 => */ 0x3238,
/* 0x83 => */ 0x3338,
/* 0x84 => */ 0x3438,
/* 0x85 => */ 0x3538,
/* 0x86 => */ 0x3638,
/* 0x87 => */ 0x3738,
/* 0x88 => */ 0x3838,
/* 0x89 => */ 0x3938,
/* 0x8a => */ 0x6138,
/* 0x8b => */ 0x6238,
/* 0x8c => */ 0x6338,
/* 0x8d => */ 0x6438,
/* 0x8e => */ 0x6538,
/* 0x8f => */ 0x6638,
/* 0x90 => */ 0x3039,
/* 0x91 => */ 0x3139,
/* 0x92 => */ 0x3239,
/* 0x93 => */ 0x3339,
/* 0x94 => */ 0x3439,
/* 0x95 => */ 0x3539,
/* 0x96 => */ 0x3639,
/* 0x97 => */ 0x3739,
/* 0x98 => */ 0x3839,
/* 0x99 => */ 0x3939,
/* 0x9a => */ 0x6139,
/* 0x9b => */ 0x6239,
/* 0x9c => */ 0x6339,
/* 0x9d => */ 0x6439,
/* 0x9e => */ 0x6539,
/* 0x9f => */ 0x6639,
/* 0xa0 => */ 0x3061,
/* 0xa1 => */ 0x3161,
/* 0xa2 => */ 0x3261,
/* 0xa3 => */ 0x3361,
/* 0xa4 => */ 0x3461,
/* 0xa5 => */ 0x3561,
/* 0xa6 => */ 0x3661,
/* 0xa7 => */ 0x3761,
/* 0xa8 => */ 0x3861,
/* 0xa9 => */ 0x3961,
/* 0xaa => */ 0x6161,
/* 0xab => */ 0x6261,
/* 0xac => */ 0x6361,
/* 0xad => */ 0x6461,
/* 0xae => */ 0x6561,
/* 0xaf => */ 0x6661,
/* 0xb0 => */ 0x3062,
/* 0xb1 => */ 0x3162,
/* 0xb2 => */ 0x3262,
/* 0xb3 => */ 0x3362,
/* 0xb4 => */ 0x3462,
/* 0xb5 => */ 0x3562,
/* 0xb6 => */ 0x3662,
/* 0xb7 => */ 0x3762,
/* 0xb8 => */ 0x3862,
/* 0xb9 => */ 0x3962,
/* 0xba => */ 0x6162,
/* 0xbb => */ 0x6262,
/* 0xbc => */ 0x6362,
/* 0xbd => */ 0x6462,
/* 0xbe => */ 0x6562,
/* 0xbf => */ 0x6662,
/* 0xc0 => */ 0x3063,
/* 0xc1 => */ 0x3163,
/* 0xc2 => */ 0x3263,
/* 0xc3 => */ 0x3363,
/* 0xc4 => */ 0x3463,
/* 0xc5 => */ 0x3563,
/* 0xc6 => */ 0x3663,
/* 0xc7 => */ 0x3763,
/* 0xc8 => */ 0x3863,
/* 0xc9 => */ 0x3963,
/* 0xca => */ 0x6163,
/* 0xcb => */ 0x6263,
/* 0xcc => */ 0x6363,
/* 0xcd => */ 0x6463,
/* 0xce => */ 0x6563,
/* 0xcf => */ 0x6663,
/* 0xd0 => */ 0x3064,
/* 0xd1 => */ 0x3164,
/* 0xd2 => */ 0x3264,
/* 0xd3 => */ 0x3364,
/* 0xd4 => */ 0x3464,
/* 0xd5 => */ 0x3564,
/* 0xd6 => */ 0x3664,
/* 0xd7 => */ 0x3764,
/* 0xd8 => */ 0x3864,
/* 0xd9 => */ 0x3964,
/* 0xda => */ 0x6164,
/* 0xdb => */ 0x6264,
/* 0xdc => */ 0x6364,
/* 0xdd => */ 0x6464,
/* 0xde => */ 0x6564,
/* 0xdf => */ 0x6664,
/* 0xe0 => */ 0x3065,
/* 0xe1 => */ 0x3165,
/* 0xe2 => */ 0x3265,
/* 0xe3 => */ 0x3365,
/* 0xe4 => */ 0x3465,
/* 0xe5 => */ 0x3565,
/* 0xe6 => */ 0x3665,
/* 0xe7 => */ 0x3765,
/* 0xe8 => */ 0x3865,
/* 0xe9 => */ 0x3965,
/* 0xea => */ 0x6165,
/* 0xeb => */ 0x6265,
/* 0xec => */ 0x6365,
/* 0xed => */ 0x6465,
/* 0xee => */ 0x6565,
/* 0xef => */ 0x6665,
/* 0xf0 => */ 0x3066,
/* 0xf1 => */ 0x3166,
/* 0xf2 => */ 0x3266,
/* 0xf3 => */ 0x3366,
/* 0xf4 => */ 0x3466,
/* 0xf5 => */ 0x3566,
/* 0xf6 => */ 0x3666,
/* 0xf7 => */ 0x3766,
/* 0xf8 => */ 0x3866,
/* 0xf9 => */ 0x3966,
/* 0xfa => */ 0x6166,
/* 0xfb => */ 0x6266,
/* 0xfc => */ 0x6366,
/* 0xfd => */ 0x6466,
/* 0xfe => */ 0x6566,
/* 0xff => */ 0x6666
};
for (const u8* i = begin; i != end; ++i) {
uint16_t x = table[*i];
memcpy(o, &x, sizeof x);
o += 2;
}
} else { // A == 'A'
static const uint16_t table[] = {
/* 0x00 => */ 0x3030,
/* 0x01 => */ 0x3130,
/* 0x02 => */ 0x3230,
/* 0x03 => */ 0x3330,
/* 0x04 => */ 0x3430,
/* 0x05 => */ 0x3530,
/* 0x06 => */ 0x3630,
/* 0x07 => */ 0x3730,
/* 0x08 => */ 0x3830,
/* 0x09 => */ 0x3930,
/* 0x0a => */ 0x4130,
/* 0x0b => */ 0x4230,
/* 0x0c => */ 0x4330,
/* 0x0d => */ 0x4430,
/* 0x0e => */ 0x4530,
/* 0x0f => */ 0x4630,
/* 0x10 => */ 0x3031,
/* 0x11 => */ 0x3131,
/* 0x12 => */ 0x3231,
/* 0x13 => */ 0x3331,
/* 0x14 => */ 0x3431,
/* 0x15 => */ 0x3531,
/* 0x16 => */ 0x3631,
/* 0x17 => */ 0x3731,
/* 0x18 => */ 0x3831,
/* 0x19 => */ 0x3931,
/* 0x1a => */ 0x4131,
/* 0x1b => */ 0x4231,
/* 0x1c => */ 0x4331,
/* 0x1d => */ 0x4431,
/* 0x1e => */ 0x4531,
/* 0x1f => */ 0x4631,
/* 0x20 => */ 0x3032,
/* 0x21 => */ 0x3132,
/* 0x22 => */ 0x3232,
/* 0x23 => */ 0x3332,
/* 0x24 => */ 0x3432,
/* 0x25 => */ 0x3532,
/* 0x26 => */ 0x3632,
/* 0x27 => */ 0x3732,
/* 0x28 => */ 0x3832,
/* 0x29 => */ 0x3932,
/* 0x2a => */ 0x4132,
/* 0x2b => */ 0x4232,
/* 0x2c => */ 0x4332,
/* 0x2d => */ 0x4432,
/* 0x2e => */ 0x4532,
/* 0x2f => */ 0x4632,
/* 0x30 => */ 0x3033,
/* 0x31 => */ 0x3133,
/* 0x32 => */ 0x3233,
/* 0x33 => */ 0x3333,
/* 0x34 => */ 0x3433,
/* 0x35 => */ 0x3533,
/* 0x36 => */ 0x3633,
/* 0x37 => */ 0x3733,
/* 0x38 => */ 0x3833,
/* 0x39 => */ 0x3933,
/* 0x3a => */ 0x4133,
/* 0x3b => */ 0x4233,
/* 0x3c => */ 0x4333,
/* 0x3d => */ 0x4433,
/* 0x3e => */ 0x4533,
/* 0x3f => */ 0x4633,
/* 0x40 => */ 0x3034,
/* 0x41 => */ 0x3134,
/* 0x42 => */ 0x3234,
/* 0x43 => */ 0x3334,
/* 0x44 => */ 0x3434,
/* 0x45 => */ 0x3534,
/* 0x46 => */ 0x3634,
/* 0x47 => */ 0x3734,
/* 0x48 => */ 0x3834,
/* 0x49 => */ 0x3934,
/* 0x4a => */ 0x4134,
/* 0x4b => */ 0x4234,
/* 0x4c => */ 0x4334,
/* 0x4d => */ 0x4434,
/* 0x4e => */ 0x4534,
/* 0x4f => */ 0x4634,
/* 0x50 => */ 0x3035,
/* 0x51 => */ 0x3135,
/* 0x52 => */ 0x3235,
/* 0x53 => */ 0x3335,
/* 0x54 => */ 0x3435,
/* 0x55 => */ 0x3535,
/* 0x56 => */ 0x3635,
/* 0x57 => */ 0x3735,
/* 0x58 => */ 0x3835,
/* 0x59 => */ 0x3935,
/* 0x5a => */ 0x4135,
/* 0x5b => */ 0x4235,
/* 0x5c => */ 0x4335,
/* 0x5d => */ 0x4435,
/* 0x5e => */ 0x4535,
/* 0x5f => */ 0x4635,
/* 0x60 => */ 0x3036,
/* 0x61 => */ 0x3136,
/* 0x62 => */ 0x3236,
/* 0x63 => */ 0x3336,
/* 0x64 => */ 0x3436,
/* 0x65 => */ 0x3536,
/* 0x66 => */ 0x3636,
/* 0x67 => */ 0x3736,
/* 0x68 => */ 0x3836,
/* 0x69 => */ 0x3936,
/* 0x6a => */ 0x4136,
/* 0x6b => */ 0x4236,
/* 0x6c => */ 0x4336,
/* 0x6d => */ 0x4436,
/* 0x6e => */ 0x4536,
/* 0x6f => */ 0x4636,
/* 0x70 => */ 0x3037,
/* 0x71 => */ 0x3137,
/* 0x72 => */ 0x3237,
/* 0x73 => */ 0x3337,
/* 0x74 => */ 0x3437,
/* 0x75 => */ 0x3537,
/* 0x76 => */ 0x3637,
/* 0x77 => */ 0x3737,
/* 0x78 => */ 0x3837,
/* 0x79 => */ 0x3937,
/* 0x7a => */ 0x4137,
/* 0x7b => */ 0x4237,
/* 0x7c => */ 0x4337,
/* 0x7d => */ 0x4437,
/* 0x7e => */ 0x4537,
/* 0x7f => */ 0x4637,
/* 0x80 => */ 0x3038,
/* 0x81 => */ 0x3138,
/* 0x82 => */ 0x3238,
/* 0x83 => */ 0x3338,
/* 0x84 => */ 0x3438,
/* 0x85 => */ 0x3538,
/* 0x86 => */ 0x3638,
/* 0x87 => */ 0x3738,
/* 0x88 => */ 0x3838,
/* 0x89 => */ 0x3938,
/* 0x8a => */ 0x4138,
/* 0x8b => */ 0x4238,
/* 0x8c => */ 0x4338,
/* 0x8d => */ 0x4438,
/* 0x8e => */ 0x4538,
/* 0x8f => */ 0x4638,
/* 0x90 => */ 0x3039,
/* 0x91 => */ 0x3139,
/* 0x92 => */ 0x3239,
/* 0x93 => */ 0x3339,
/* 0x94 => */ 0x3439,
/* 0x95 => */ 0x3539,
/* 0x96 => */ 0x3639,
/* 0x97 => */ 0x3739,
/* 0x98 => */ 0x3839,
/* 0x99 => */ 0x3939,
/* 0x9a => */ 0x4139,
/* 0x9b => */ 0x4239,
/* 0x9c => */ 0x4339,
/* 0x9d => */ 0x4439,
/* 0x9e => */ 0x4539,
/* 0x9f => */ 0x4639,
/* 0xa0 => */ 0x3041,
/* 0xa1 => */ 0x3141,
/* 0xa2 => */ 0x3241,
/* 0xa3 => */ 0x3341,
/* 0xa4 => */ 0x3441,
/* 0xa5 => */ 0x3541,
/* 0xa6 => */ 0x3641,
/* 0xa7 => */ 0x3741,
/* 0xa8 => */ 0x3841,
/* 0xa9 => */ 0x3941,
/* 0xaa => */ 0x4141,
/* 0xab => */ 0x4241,
/* 0xac => */ 0x4341,
/* 0xad => */ 0x4441,
/* 0xae => */ 0x4541,
/* 0xaf => */ 0x4641,
/* 0xb0 => */ 0x3042,
/* 0xb1 => */ 0x3142,
/* 0xb2 => */ 0x3242,
/* 0xb3 => */ 0x3342,
/* 0xb4 => */ 0x3442,
/* 0xb5 => */ 0x3542,
/* 0xb6 => */ 0x3642,
/* 0xb7 => */ 0x3742,
/* 0xb8 => */ 0x3842,
/* 0xb9 => */ 0x3942,
/* 0xba => */ 0x4142,
/* 0xbb => */ 0x4242,
/* 0xbc => */ 0x4342,
/* 0xbd => */ 0x4442,
/* 0xbe => */ 0x4542,
/* 0xbf => */ 0x4642,
/* 0xc0 => */ 0x3043,
/* 0xc1 => */ 0x3143,
/* 0xc2 => */ 0x3243,
/* 0xc3 => */ 0x3343,
/* 0xc4 => */ 0x3443,
/* 0xc5 => */ 0x3543,
/* 0xc6 => */ 0x3643,
/* 0xc7 => */ 0x3743,
/* 0xc8 => */ 0x3843,
/* 0xc9 => */ 0x3943,
/* 0xca => */ 0x4143,
/* 0xcb => */ 0x4243,
/* 0xcc => */ 0x4343,
/* 0xcd => */ 0x4443,
/* 0xce => */ 0x4543,
/* 0xcf => */ 0x4643,
/* 0xd0 => */ 0x3044,
/* 0xd1 => */ 0x3144,
/* 0xd2 => */ 0x3244,
/* 0xd3 => */ 0x3344,
/* 0xd4 => */ 0x3444,
/* 0xd5 => */ 0x3544,
/* 0xd6 => */ 0x3644,
/* 0xd7 => */ 0x3744,
/* 0xd8 => */ 0x3844,
/* 0xd9 => */ 0x3944,
/* 0xda => */ 0x4144,
/* 0xdb => */ 0x4244,
/* 0xdc => */ 0x4344,
/* 0xdd => */ 0x4444,
/* 0xde => */ 0x4544,
/* 0xdf => */ 0x4644,
/* 0xe0 => */ 0x3045,
/* 0xe1 => */ 0x3145,
/* 0xe2 => */ 0x3245,
/* 0xe3 => */ 0x3345,
/* 0xe4 => */ 0x3445,
/* 0xe5 => */ 0x3545,
/* 0xe6 => */ 0x3645,
/* 0xe7 => */ 0x3745,
/* 0xe8 => */ 0x3845,
/* 0xe9 => */ 0x3945,
/* 0xea => */ 0x4145,
/* 0xeb => */ 0x4245,
/* 0xec => */ 0x4345,
/* 0xed => */ 0x4445,
/* 0xee => */ 0x4545,
/* 0xef => */ 0x4645,
/* 0xf0 => */ 0x3046,
/* 0xf1 => */ 0x3146,
/* 0xf2 => */ 0x3246,
/* 0xf3 => */ 0x3346,
/* 0xf4 => */ 0x3446,
/* 0xf5 => */ 0x3546,
/* 0xf6 => */ 0x3646,
/* 0xf7 => */ 0x3746,
/* 0xf8 => */ 0x3846,
/* 0xf9 => */ 0x3946,
/* 0xfa => */ 0x4146,
/* 0xfb => */ 0x4246,
/* 0xfc => */ 0x4346,
/* 0xfd => */ 0x4446,
/* 0xfe => */ 0x4546,
/* 0xff => */ 0x4646
};
for (const u8* i = begin; i != end; ++i) {
uint16_t x = table[*i];
memcpy(o, &x, sizeof x);
o += 2;
}
}
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
if (A == 'a') {
static const uint16_t table[] = {
/* 0x00 => */ 0x3030,
/* 0x01 => */ 0x3031,
/* 0x02 => */ 0x3032,
/* 0x03 => */ 0x3033,
/* 0x04 => */ 0x3034,
/* 0x05 => */ 0x3035,
/* 0x06 => */ 0x3036,
/* 0x07 => */ 0x3037,
/* 0x08 => */ 0x3038,
/* 0x09 => */ 0x3039,
/* 0x0a => */ 0x3061,
/* 0x0b => */ 0x3062,
/* 0x0c => */ 0x3063,
/* 0x0d => */ 0x3064,
/* 0x0e => */ 0x3065,
/* 0x0f => */ 0x3066,
/* 0x10 => */ 0x3130,
/* 0x11 => */ 0x3131,
/* 0x12 => */ 0x3132,
/* 0x13 => */ 0x3133,
/* 0x14 => */ 0x3134,
/* 0x15 => */ 0x3135,
/* 0x16 => */ 0x3136,
/* 0x17 => */ 0x3137,
/* 0x18 => */ 0x3138,
/* 0x19 => */ 0x3139,
/* 0x1a => */ 0x3161,
/* 0x1b => */ 0x3162,
/* 0x1c => */ 0x3163,
/* 0x1d => */ 0x3164,
/* 0x1e => */ 0x3165,
/* 0x1f => */ 0x3166,
/* 0x20 => */ 0x3230,
/* 0x21 => */ 0x3231,
/* 0x22 => */ 0x3232,
/* 0x23 => */ 0x3233,
/* 0x24 => */ 0x3234,
/* 0x25 => */ 0x3235,
/* 0x26 => */ 0x3236,
/* 0x27 => */ 0x3237,
/* 0x28 => */ 0x3238,
/* 0x29 => */ 0x3239,
/* 0x2a => */ 0x3261,
/* 0x2b => */ 0x3262,
/* 0x2c => */ 0x3263,
/* 0x2d => */ 0x3264,
/* 0x2e => */ 0x3265,
/* 0x2f => */ 0x3266,
/* 0x30 => */ 0x3330,
/* 0x31 => */ 0x3331,
/* 0x32 => */ 0x3332,
/* 0x33 => */ 0x3333,
/* 0x34 => */ 0x3334,
/* 0x35 => */ 0x3335,
/* 0x36 => */ 0x3336,
/* 0x37 => */ 0x3337,
/* 0x38 => */ 0x3338,
/* 0x39 => */ 0x3339,
/* 0x3a => */ 0x3361,
/* 0x3b => */ 0x3362,
/* 0x3c => */ 0x3363,
/* 0x3d => */ 0x3364,
/* 0x3e => */ 0x3365,
/* 0x3f => */ 0x3366,
/* 0x40 => */ 0x3430,
/* 0x41 => */ 0x3431,
/* 0x42 => */ 0x3432,
/* 0x43 => */ 0x3433,
/* 0x44 => */ 0x3434,
/* 0x45 => */ 0x3435,
/* 0x46 => */ 0x3436,
/* 0x47 => */ 0x3437,
/* 0x48 => */ 0x3438,
/* 0x49 => */ 0x3439,
/* 0x4a => */ 0x3461,
/* 0x4b => */ 0x3462,
/* 0x4c => */ 0x3463,
/* 0x4d => */ 0x3464,
/* 0x4e => */ 0x3465,
/* 0x4f => */ 0x3466,
/* 0x50 => */ 0x3530,
/* 0x51 => */ 0x3531,
/* 0x52 => */ 0x3532,
/* 0x53 => */ 0x3533,
/* 0x54 => */ 0x3534,
/* 0x55 => */ 0x3535,
/* 0x56 => */ 0x3536,
/* 0x57 => */ 0x3537,
/* 0x58 => */ 0x3538,
/* 0x59 => */ 0x3539,
/* 0x5a => */ 0x3561,
/* 0x5b => */ 0x3562,
/* 0x5c => */ 0x3563,
/* 0x5d => */ 0x3564,
/* 0x5e => */ 0x3565,
/* 0x5f => */ 0x3566,
/* 0x60 => */ 0x3630,
/* 0x61 => */ 0x3631,
/* 0x62 => */ 0x3632,
/* 0x63 => */ 0x3633,
/* 0x64 => */ 0x3634,
/* 0x65 => */ 0x3635,
/* 0x66 => */ 0x3636,
/* 0x67 => */ 0x3637,
/* 0x68 => */ 0x3638,
/* 0x69 => */ 0x3639,
/* 0x6a => */ 0x3661,
/* 0x6b => */ 0x3662,
/* 0x6c => */ 0x3663,
/* 0x6d => */ 0x3664,
/* 0x6e => */ 0x3665,
/* 0x6f => */ 0x3666,
/* 0x70 => */ 0x3730,
/* 0x71 => */ 0x3731,
/* 0x72 => */ 0x3732,
/* 0x73 => */ 0x3733,
/* 0x74 => */ 0x3734,
/* 0x75 => */ 0x3735,
/* 0x76 => */ 0x3736,
/* 0x77 => */ 0x3737,
/* 0x78 => */ 0x3738,
/* 0x79 => */ 0x3739,
/* 0x7a => */ 0x3761,
/* 0x7b => */ 0x3762,
/* 0x7c => */ 0x3763,
/* 0x7d => */ 0x3764,
/* 0x7e => */ 0x3765,
/* 0x7f => */ 0x3766,
/* 0x80 => */ 0x3830,
/* 0x81 => */ 0x3831,
/* 0x82 => */ 0x3832,
/* 0x83 => */ 0x3833,
/* 0x84 => */ 0x3834,
/* 0x85 => */ 0x3835,
/* 0x86 => */ 0x3836,
/* 0x87 => */ 0x3837,
/* 0x88 => */ 0x3838,
/* 0x89 => */ 0x3839,
/* 0x8a => */ 0x3861,
/* 0x8b => */ 0x3862,
/* 0x8c => */ 0x3863,
/* 0x8d => */ 0x3864,
/* 0x8e => */ 0x3865,
/* 0x8f => */ 0x3866,
/* 0x90 => */ 0x3930,
/* 0x91 => */ 0x3931,
/* 0x92 => */ 0x3932,
/* 0x93 => */ 0x3933,
/* 0x94 => */ 0x3934,
/* 0x95 => */ 0x3935,
/* 0x96 => */ 0x3936,
/* 0x97 => */ 0x3937,
/* 0x98 => */ 0x3938,
/* 0x99 => */ 0x3939,
/* 0x9a => */ 0x3961,
/* 0x9b => */ 0x3962,
/* 0x9c => */ 0x3963,
/* 0x9d => */ 0x3964,
/* 0x9e => */ 0x3965,
/* 0x9f => */ 0x3966,
/* 0xa0 => */ 0x6130,
/* 0xa1 => */ 0x6131,
/* 0xa2 => */ 0x6132,
/* 0xa3 => */ 0x6133,
/* 0xa4 => */ 0x6134,
/* 0xa5 => */ 0x6135,
/* 0xa6 => */ 0x6136,
/* 0xa7 => */ 0x6137,
/* 0xa8 => */ 0x6138,
/* 0xa9 => */ 0x6139,
/* 0xaa => */ 0x6161,
/* 0xab => */ 0x6162,
/* 0xac => */ 0x6163,
/* 0xad => */ 0x6164,
/* 0xae => */ 0x6165,
/* 0xaf => */ 0x6166,
/* 0xb0 => */ 0x6230,
/* 0xb1 => */ 0x6231,
/* 0xb2 => */ 0x6232,
/* 0xb3 => */ 0x6233,
/* 0xb4 => */ 0x6234,
/* 0xb5 => */ 0x6235,
/* 0xb6 => */ 0x6236,
/* 0xb7 => */ 0x6237,
/* 0xb8 => */ 0x6238,
/* 0xb9 => */ 0x6239,
/* 0xba => */ 0x6261,
/* 0xbb => */ 0x6262,
/* 0xbc => */ 0x6263,
/* 0xbd => */ 0x6264,
/* 0xbe => */ 0x6265,
/* 0xbf => */ 0x6266,
/* 0xc0 => */ 0x6330,
/* 0xc1 => */ 0x6331,
/* 0xc2 => */ 0x6332,
/* 0xc3 => */ 0x6333,
/* 0xc4 => */ 0x6334,
/* 0xc5 => */ 0x6335,
/* 0xc6 => */ 0x6336,
/* 0xc7 => */ 0x6337,
/* 0xc8 => */ 0x6338,
/* 0xc9 => */ 0x6339,
/* 0xca => */ 0x6361,
/* 0xcb => */ 0x6362,
/* 0xcc => */ 0x6363,
/* 0xcd => */ 0x6364,
/* 0xce => */ 0x6365,
/* 0xcf => */ 0x6366,
/* 0xd0 => */ 0x6430,
/* 0xd1 => */ 0x6431,
/* 0xd2 => */ 0x6432,
/* 0xd3 => */ 0x6433,
/* 0xd4 => */ 0x6434,
/* 0xd5 => */ 0x6435,
/* 0xd6 => */ 0x6436,
/* 0xd7 => */ 0x6437,
/* 0xd8 => */ 0x6438,
/* 0xd9 => */ 0x6439,
/* 0xda => */ 0x6461,
/* 0xdb => */ 0x6462,
/* 0xdc => */ 0x6463,
/* 0xdd => */ 0x6464,
/* 0xde => */ 0x6465,
/* 0xdf => */ 0x6466,
/* 0xe0 => */ 0x6530,
/* 0xe1 => */ 0x6531,
/* 0xe2 => */ 0x6532,
/* 0xe3 => */ 0x6533,
/* 0xe4 => */ 0x6534,
/* 0xe5 => */ 0x6535,
/* 0xe6 => */ 0x6536,
/* 0xe7 => */ 0x6537,
/* 0xe8 => */ 0x6538,
/* 0xe9 => */ 0x6539,
/* 0xea => */ 0x6561,
/* 0xeb => */ 0x6562,
/* 0xec => */ 0x6563,
/* 0xed => */ 0x6564,
/* 0xee => */ 0x6565,
/* 0xef => */ 0x6566,
/* 0xf0 => */ 0x6630,
/* 0xf1 => */ 0x6631,
/* 0xf2 => */ 0x6632,
/* 0xf3 => */ 0x6633,
/* 0xf4 => */ 0x6634,
/* 0xf5 => */ 0x6635,
/* 0xf6 => */ 0x6636,
/* 0xf7 => */ 0x6637,
/* 0xf8 => */ 0x6638,
/* 0xf9 => */ 0x6639,
/* 0xfa => */ 0x6661,
/* 0xfb => */ 0x6662,
/* 0xfc => */ 0x6663,
/* 0xfd => */ 0x6664,
/* 0xfe => */ 0x6665,
/* 0xff => */ 0x6666
};
for (const u8* i = begin; i != end; ++i) {
uint16_t x = table[*i];
memcpy(o, &x, sizeof x);
o += 2;
}
} else { // A == 'A'
static const uint16_t table[] = {
/* 0x00 => */ 0x3030,
/* 0x01 => */ 0x3031,
/* 0x02 => */ 0x3032,
/* 0x03 => */ 0x3033,
/* 0x04 => */ 0x3034,
/* 0x05 => */ 0x3035,
/* 0x06 => */ 0x3036,
/* 0x07 => */ 0x3037,
/* 0x08 => */ 0x3038,
/* 0x09 => */ 0x3039,
/* 0x0a => */ 0x3041,
/* 0x0b => */ 0x3042,
/* 0x0c => */ 0x3043,