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| author | Rich Felker <dalias@aerifal.cx> | 2024-05-06 17:13:23 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2024-05-06 17:13:23 -0400 |
| commit | 3f9d4224d8db7868b6c2f526746d597785d30c61 (patch) | |
| tree | 29e628c78af5507e3200b06f0153162fc51aa926 /src/stdio | |
| parent | a23cf8f9c5ab8ff1e1742a68b352e58b9febbe4a (diff) | |
| download | musl-3f9d4224d8db7868b6c2f526746d597785d30c61.tar.gz | |
printf decimal integer formatting: shave off one division
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.
Diffstat (limited to 'src/stdio')
| -rw-r--r-- | src/stdio/vfprintf.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c index dc648e7e..360d723a 100644 --- a/src/stdio/vfprintf.c +++ b/src/stdio/vfprintf.c @@ -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; } |