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Merge branch 'faster_toLower' into 'master'

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Improve the speed of toLower

See merge request OpenMW/openmw!1889
This commit is contained in:
psi29a 2022-05-24 07:53:01 +00:00
commit a737b05d84
2 changed files with 23 additions and 4 deletions
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4
apps/openmw_test_suite/misc/test_stringops.cpp
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@ -93,8 +93,8 @@ namespace
using RawValue = const char[4];
constexpr RawValue foo = "foo";
constexpr RawValue fooUpper = "FOO";
constexpr RawValue foo = "f0#";
constexpr RawValue fooUpper = "F0#";
constexpr RawValue bar = "bar";
template <typename T>

23
components/misc/stringops.hpp
View File

@ -8,6 +8,25 @@
#include <iterator>
#include <functional>
/* Mapping table to go from uppercase to lowercase for plain ASCII.*/
static constexpr unsigned char tolowermap[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41,
42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
62, 63, 64, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110,
111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
};
namespace Misc
{
class StringUtils
@ -38,9 +57,9 @@ public:
/// Plain and simple locale-unaware toLower. Anything from A to Z is lower-cased, multibyte characters are unchanged.
/// Don't use std::tolower(char, locale&) because that is abysmally slow.
/// Don't use tolower(int) because that depends on global locale.
static char toLower(char c)
static constexpr char toLower(char c)
{
return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c;
return tolowermap[static_cast<unsigned char>(c)];
}
static bool ciLess(const std::string &x, const std::string &y) {