Date: Mon, 22 Sep 2003 14:46:48 -0700 (PDT) From: Peter Wemm <peter@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/include endian.h Message-ID: <200309222146.h8MLkmia045781@repoman.freebsd.org>
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peter 2003/09/22 14:46:48 PDT
FreeBSD src repository
Modified files:
sys/i386/include endian.h
Log:
Microoptimization to allow the compiler to evaluate ntohl() etc on
known constants at compile time rather than at run time. We have a number
of nasty hacks around the place to cache ntohl() of constants (eg: nfs).
This change allows the compiler to compile-time evaluate ntohl(1) as
0x01000000 rather than having to emit assembler code to do it. This
has other smaller flow-on effects because the compiler can see that
ntohl(constant) itself has a constant value now and can propagate the
compile time evaluation.
Obtained from: Ideas from NetBSD and Linux, and some code from NetBSD
Revision Changes Path
1.37 +49 -4 src/sys/i386/include/endian.h
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