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Use memcpy in more cases in copy2

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This commit is contained in:
Victor Zverovich 2021-09-12 12:23:45 -07:00
parent e47e99bb09
commit 04e3a79f76
1 changed files with 6 additions and 10 deletions
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12
include/fmt/format.h
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@ -1051,16 +1051,12 @@ inline auto equal2(const char* lhs, const char* rhs) -> bool {
// Copies two characters from src to dst. // Copies two characters from src to dst.
template <typename Char> template <typename Char>
FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) { FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) {
if (!is_constant_evaluated() && std::is_same<Char, char>::value) { if (!is_constant_evaluated() && sizeof(Char) == sizeof(char)) {
memcpy(dst, src, 2); memcpy(dst, src, 2);
} else { return;
// We read both bytes before writing so that the compiler can do it in
// one pair of read/write instructions (even if Char aliases char)
char dc0 = *src++;
char dc1 = *src;
*dst++ = static_cast<Char>(dc0);
*dst = static_cast<Char>(dc1);
} }
*dst++ = static_cast<Char>(*src++);
*dst = static_cast<Char>(*src);
} }
template <typename Iterator> struct format_decimal_result { template <typename Iterator> struct format_decimal_result {