From: "Riley Williams" <Riley@Williams.Name> To: "Alan Cox" <firstname.lastname@example.org> Cc: "Linux Kernel Mailing List" <email@example.com> Subject: Re: Interrupt doesn't make it to the 8259 on a ASUS P4PE mobo Date: Sun, 20 Jul 2003 22:04:31 +0100 [thread overview] Message-ID: <BKEGKPICNAKILKJKMHCAMEJJEPAA.Riley@Williams.Name> (raw) In-Reply-To: <firstname.lastname@example.org> Hi Alan. >>>> Use HZ/2 instead. GCC doesn't optimize floating point constants >>>> to the same degree it does integers, because it doesn't know what >>>> mode (rounding, precision) the FPU is in. >>> Isn't (HZ >> 1) better? >> Same thing. GCC knows that division by a power of 2 is just a shift. > Only for unsigned When I did the "Assembler Language Maths Logic" module for my degree, we learned that processors used SRL (Shift Right Logical) to divide unsigned numbers by powers of 2, and SRA (Shift Right Arithmetic) to divide signed numbers by powers of 2. Can't GCC handle that? Best wishes from Riley. --- * Nothing as pretty as a smile, nothing as ugly as a frown. --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.502 / Virus Database: 300 - Release Date: 18-Jul-2003
next prev parent reply other threads:[~2003-07-20 20:49 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <email@example.com> 2003-07-15 16:14 ` Kathy Frazier 2003-07-15 15:31 ` Richard B. Johnson 2003-07-15 15:58 ` SCSI ATA driver in 2.4.22 ? Jeff Mock 2003-07-15 16:14 ` Jeff Garzik 2003-07-15 17:06 ` Interrupt doesn't make it to the 8259 on a ASUS P4PE mobo Brian Gerst 2003-07-15 17:43 ` Jamie Lokier 2003-07-15 17:59 ` Luciano Miguel Ferreira Rocha 2003-07-15 18:24 ` Brian Gerst 2003-07-15 18:44 ` Alan Cox 2003-07-15 19:44 ` Jamie Lokier 2003-07-20 21:04 ` Riley Williams [this message] 2003-07-20 22:25 ` Jeremy Fitzhardinge [not found] <Pine.LNX.4.53.0307141833190.4354@chaos> 2003-07-15 16:52 ` Kathy Frazier 2003-07-14 21:35 Kathy Frazier
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