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Re: Big git diff speedup by avoiding x86 "fast string" memcmp
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From: David Miller
Subject:
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
Date: Thursday, December 16, 2010 - 10:57 am
From: Boaz Harrosh <bharrosh@panasas.com> Date: Thu, 16 Dec 2010 11:53:09 +0200
quoted text
> You miss understood me. I'm saying that we know the beggining of the > string is aligned and Nick offered to pad the last long, so surly > a shift by 2 (or 3) + the reduction of the 12 dec-and-test to 3 > should give you an optimization?
Indeed, we could do something interesting in the case where both strings are tail padded like that. --
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Messages in current thread:
Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Thu Dec 9, 12:09 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Borislav Petkov
, (Thu Dec 9, 6:37 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Thu Dec 9, 7:38 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Thu Dec 9, 9:27 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, J. R. Okajima
, (Fri Dec 10, 7:23 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Sun Dec 12, 6:45 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, J. R. Okajima
, (Mon Dec 13, 12:29 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Mon Dec 13, 1:25 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, J. R. Okajima
, (Tue Dec 14, 12:01 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Américo Wang
, (Tue Dec 14, 9:38 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Tue Dec 14, 10:54 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, J. R. Okajima
, (Tue Dec 14, 10:57 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Linus Torvalds
, (Wed Dec 15, 12:12 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, David Miller
, (Wed Dec 15, 11:00 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Tony Luck
, (Wed Dec 15, 4:09 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Wed Dec 15, 7:34 pm)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Boaz Harrosh
, (Thu Dec 16, 2:53 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Thu Dec 16, 6:13 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Boaz Harrosh
, (Thu Dec 16, 7:03 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Nick Piggin
, (Thu Dec 16, 7:15 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, Linus Torvalds
, (Thu Dec 16, 9:51 am)
Re: Big git diff speedup by avoiding x86 "fast string" memcmp
, David Miller
, (Thu Dec 16, 10:57 am)
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