Date: Sat, 22 Sep 2012 17:49:26 +0000 (UTC) From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r240834 - head/sys/sys Message-ID: <201209221749.q8MHnQgx012102@svn.freebsd.org>
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Author: pjd Date: Sat Sep 22 17:49:25 2012 New Revision: 240834 URL: http://svn.freebsd.org/changeset/base/240834 Log: Add rounddown2() macro similar to the roundup2() macro. Modified: head/sys/sys/param.h Modified: head/sys/sys/param.h ============================================================================== --- head/sys/sys/param.h Sat Sep 22 17:47:37 2012 (r240833) +++ head/sys/sys/param.h Sat Sep 22 17:49:25 2012 (r240834) @@ -275,6 +275,7 @@ #endif #define nitems(x) (sizeof((x)) / sizeof((x)[0])) #define rounddown(x, y) (((x)/(y))*(y)) +#define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */ #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ #define powerof2(x) ((((x)-1)&(x))==0)
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