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From: | "Bob W" <dontsend AT operamail DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: Sequence points, any? |
Date: | 5 Apr 2006 17:40:45 -0700 |
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To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Thank you very much for your post. That was pretty good analysis, which was also good enough to remove my remaining doubts about the new way gcc is handling the kind of code mentioned in this thread. > > If gcc's out-of-sequence optimisation is prevented > > by using one of the methods mentioned previously, > > the program actually executes a touch faster. > > ... on the CPU you tried it on. Which may not be the one it was > optimizing for. I presume that you are not referring to specific submodel targets here (e.g. P3, P4, etc.). You probably have meant to tell me that gcc's general compile method gets tuned torwards hyperthreading capable targets - and gcc sticks to its new way of handling things regardless whether a "vintage target" like the P3 is specified in the command line option or not. Did I get this right?
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