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printf decimal integer formatting: shave off one division

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once the remaining value is less than 10, the modulo operation to
produce the final digit and division to prepare for next loop
iteration can be dropped. this may be a meaningful performance
distinction when formatting low-magnitude numbers in bulk, and should
never hurt.

based on patch by Viktor Reznov.
This commit is contained in:
Rich Felker 2024-05-06 17:13:23 -04:00
parent a23cf8f9c5
commit 3f9d4224d8
1 changed files with 2 additions and 1 deletions
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3
src/stdio/vfprintf.c
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@ -166,7 +166,8 @@ static char *fmt_u(uintmax_t x, char *s)
{
unsigned long y;
for ( ; x>ULONG_MAX; x/=10) *--s = '0' + x%10;
for (y=x; y; y/=10) *--s = '0' + y%10;
for (y=x; y>=10; y/=10) *--s = '0' + y%10;
if (y) *--s = '0' + y;
return s;
}