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Improve code_point_length codegen on older gcc

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This commit is contained in:
Victor Zverovich 2021-09-07 19:34:13 -07:00
parent aeee70a815
commit a58c133821
1 changed files with 3 additions and 3 deletions
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6
include/fmt/core.h
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@ -94,7 +94,7 @@
# define FMT_CONSTEXPR_DECL
#endif
#if ((__cplusplus >= 202002L) && \
#if ((__cplusplus >= 202002L) && \
(!defined(_GLIBCXX_RELEASE) || _GLIBCXX_RELEASE > 9)) || \
(__cplusplus >= 201709L && FMT_GCC_VERSION >= 1002)
# define FMT_CONSTEXPR20 constexpr
@ -2140,8 +2140,8 @@ constexpr auto to_ascii(Char value) ->
template <typename Char>
FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int {
if (const_check(sizeof(Char) != 1)) return 1;
constexpr char lengths[] = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 0};
auto lengths =
"\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\0\0\0\0\0\0\0\0\2\2\2\2\3\3\4";
int len = lengths[static_cast<unsigned char>(*begin) >> 3];
// Compute the pointer to the next character early so that the next