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Skip strchr for the common case

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Victor Zverovich 2018-09-09 09:08:41 -07:00
parent 5614289dd8
commit aeb6add336
1 changed files with 3 additions and 4 deletions
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7
include/fmt/format.h
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@ -2139,11 +2139,11 @@ FMT_CONSTEXPR void parse_format_string(
Handler &handler_;
} write{handler};
auto begin = format_str.data(), end = begin + format_str.size();
for (;;) {
while (begin != end) {
// Doing two passes with memchr (one for '{' and another for '}') is up to
// 2.5x faster than the naive one-pass implementation on big format strings.
const Char *p = FMT_NULL;
if (!find<IS_CONSTEXPR>(begin, end, '{', p))
const Char *p = begin;
if (*begin != '{' && !find<IS_CONSTEXPR>(begin, end, '{', p))
return write(begin, end);
write(begin, p);
++p;
@ -2165,7 +2165,6 @@ FMT_CONSTEXPR void parse_format_string(
return handler.on_error("missing '}' in format string");
}
begin = pointer_from(it) + 1;
if (begin == end) return;
}
}