Messages in this thread | | | Subject | Re: [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization | From | Arjan van de Ven <> | Date | Sun, 24 Jun 2007 17:09:16 -0700 |
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On Sun, 2007-06-24 at 19:23 -0400, Benjamin LaHaise wrote: > On Sun, Jun 24, 2007 at 03:15:17PM -0700, Arjan van de Ven wrote: > > we should just alias our memset to the __builtin one, and then provide a > > generic one from lib/ for the cases gcc needs to do a fallback. > > The last time I checked, gcc generated horrible badly performing code for > builtin memset/memcpy() when -Os is specified.
if you care about the last cycle, don't specify -Os but -O2. simple as that... you get what you tell the compiler you want.
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