Mercurial > ecos
changeset 2366:5bcdb1b5eb69
* src/output/vfnprintf.cxx (vfnprintf): while formatting integers
in decimal, convert the value to unsigned long from unsigned long
long before processing, unless we actually print long long
argument. This tremendously speeds-up the formatting.
| author | asl |
|---|---|
| date | Wed, 28 Feb 2007 23:01:11 +0000 |
| parents | 6f3a847c9adc |
| children | 6f59b6d486cd |
| files | packages/language/c/libc/stdio/current/ChangeLog packages/language/c/libc/stdio/current/src/output/vfnprintf.cxx |
| diffstat | 2 files changed, 26 insertions(+), 7 deletions(-) [+] |
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--- a/packages/language/c/libc/stdio/current/ChangeLog +++ b/packages/language/c/libc/stdio/current/ChangeLog @@ -1,3 +1,10 @@ +2007-02-05 Sergei Organov <osv@javad.com> + + * src/output/vfnprintf.cxx (vfnprintf): while formatting integers + in decimal, convert the value to unsigned long from unsigned long + long before processing, unless we actually print long long + argument. This tremendously speeds-up the formatting. + 2007-01-16 Sergei Organov <osv@javad.com> Speed-up [v]s[n]printf() functions by a factor of about 2+. In
--- a/packages/language/c/libc/stdio/current/src/output/vfnprintf.cxx +++ b/packages/language/c/libc/stdio/current/src/output/vfnprintf.cxx @@ -553,14 +553,26 @@ number: if ((dprec = pre break; case DEC: - /* many numbers are 1 digit */ - while (_uquad >= 10) { - /* The following is usually faster than using a modulo */ - u_quad_t next = _uquad / 10; - *--cp = to_char(_uquad - (next * 10)); - _uquad = next; + if (!(flags & QUADINT)) { + /* many numbers are 1 digit */ + unsigned long v = (unsigned long)_uquad; + while (v >= 10) { + /* The following is usually faster than using a modulo */ + unsigned long next = v / 10; + *--cp = to_char(v - (next * 10)); + v = next; + } + *--cp = to_char(v); } - *--cp = to_char(_uquad); + else { + while (_uquad >= 10) { + /* The following is usually faster than using a modulo */ + u_quad_t next = _uquad / 10; + *--cp = to_char(_uquad - (next * 10)); + _uquad = next; + } + *--cp = to_char(_uquad); + } break; case HEX: