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Prev-Msg Prev-Thread Mingw-users May-2008 Next-Thread Next-Msg Subject: Re: GCC 4.3.0 20080502 (alpha) Released - Please helpus test it! Group: Mingw-users From: Brian Dessent Date: 10 May 2008 Stéphane Larouche wrote: > (no flag): (331+151)kB, 142s > -O1: (272+138)kB, 87s > -O2: (268+138)kB, 84s > -O3: (269+139)kB, 82s > -ffast-math: (326+150)kB, 115s Specifying -ffast-math without -O doesn't make any sense because in the absence of -O the compiler performs no optimization. So all the above really shows is that -ffast-math improves the unoptimized case from 142s down to 115s, but you can't meaningfully compare "-ffast-math" to "-O2" as that's apples and oranges; you should compare "-O2" to "-O2 -ffast-math". Also, you need to specify a relevant -march (with 4.3 you can use -march=native for autodetection of the host's capabilities) otherwise only the default 386 instruction set is used which is quite limiting to mathematical performance. Brian ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ MinGW-users mailing list MinGW-users You may change your MinGW Account Options or unsubscribe at: https://lists.sourceforge.net/lists/listinfo/mingw-users Prev-Msg Prev-Thread Mingw-users May-2008 Next-Thread Next-Msg

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