Re: [Patch] performance enhancement for simple_strtoul

[Pavel Machek <pavel@suse.cz>]

Hi!

> The following patch is a faster implementation of the simple_strtoul
> function. This function differs from the original in that it reduces the
> multiplies to shifts and logical operations wherever possible. My testing
> shows that it adds around 100 bytes, but is about 6% faster on a K6-2. (It
> is 40% faster that glibc's strtoul, but that's a different story.) My guess
> is that the performance gain will be higher on platforms with slower
> multiplication instructions. I have tested it for numerical accuracy so I
> think this is safe to apply. If anyone is interested, I can also supply a
> test application that demonstrates the performance gain. This patch was
> generated against 2.2.16, but should apply to 2.2.19 cleanly. In
> 2.4.0-test9, simple_strtoul starts on line 19 rather than 17, hopefully
> that's not a problem.

Simple question: who cares about performance of simple_strtoul?

Original is shorter, and simple_strtoul is not performace
critical. Keep it as it is.

-- 
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/