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Date: Tue, 16 Apr 2024 10:38:38 -0400
From: Rich Felker <dalias@...c.org>
To: Viktor Reznov <yann.collet.is.not.a.perfectionist@...il.com>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] Decreasing the number of divisions
On Tue, Apr 16, 2024 at 04:29:05PM +0300, Viktor Reznov wrote:
> diff --git a/src/stdio/vfprintf.c b/src/stdio/vfprintf.c
> index 497c5e19..0f9a1e6a 100644
> --- a/src/stdio/vfprintf.c
> +++ b/src/stdio/vfprintf.c
> @@ -165,8 +165,10 @@ static char *fmt_o(uintmax_t x, char *s)
> static char *fmt_u(uintmax_t x, char *s)
> {
> unsigned long y;
> + if (x == 0) return s;
> 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;
> + *--s = '0' + y;
> return s;
> }
Seems like a good change. Is there a reason you put the if at the top
rather than making the last line the following?
if (y) *--s = '0' + y;
That would keep the overall flow the same as before and avoid a burden
to reason about if/why it's the same.
Rich
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