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From: | Damian Yerrick <Bullcr_pd_yerrick AT hotmail DOT comRemoveBullcr_p> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: either I'm stupid or GCC once again has random behaviour |
Organization: | Pin Eight Software http://pineight.8m.com/ |
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NNTP-Posting-Date: | Fri, 05 Jan 2001 14:26:04 GMT |
Distribution: | world |
Date: | Fri, 05 Jan 2001 14:26:04 GMT |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
On Tue, 2 Jan 2001 17:41:07 -0500, "Alexei A. Frounze" <dummy_addressee AT hotmail DOT com> wrote: >Why unrolling? There is a perfect instruction REP STOSB/W/D. >What do you mean? On modern x86 CPUs a loop of simple instructions (which can be split among the U and V (and W in PII) pipelines) is actually _faster_ than the string instructions (which are complex, run in microcode, and can fit only in U). To fit code into the pipeline without time-consuming branching, unrolling loops is a necessity.
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