Messages in this thread | | | Subject | Re: Faster strlen | From | Andreas Schwab <> | Date | 27 Jul 1999 15:55:18 +0200 |
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"Alexander Maryanchick" <Sasha@GDev.msk.ru> writes:
|> Have you seen M$' CRT? |> It sometimes worth to see. |> Here is a critical piece of their 'strlen' code: |> |> mov eax,dword ptr [ecx] ; read 4 bytes |> mov edx,7efefeffh |> add edx,eax |> xor eax,-1 |> xor eax,edx |> add ecx,4 |> test eax,81010100h |> je short main_loop |> ; found zero byte in the loop
Which is not much different from the code in glibc.
|> On Pentiums this sadistic code is 4 times faster that our :-(. |> Really, Gates has his von Braun.
This is common knowlege already for at least 8 years.
-- Andreas Schwab "And now for something schwab@suse.de completely different." SuSE GmbH, Schanzäckerstr. 10, D-90443 Nürnberg
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