Date: Sun, 29 May 2016 16:39:28 +0000 (UTC) From: "Andrey A. Chernov" <ache@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r300965 - head/lib/libc/stdlib Message-ID: <201605291639.u4TGdSwq032144@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: ache Date: Sun May 29 16:39:28 2016 New Revision: 300965 URL: https://svnweb.freebsd.org/changeset/base/300965 Log: Micro optimize: C standard guarantees that right shift for unsigned value fills left bits with zero, and we have exact 32bit unsigned value (uint32_t), so there is no reason to add "& 0x7fffffff" here. MFC after: 1 week Modified: head/lib/libc/stdlib/random.c Modified: head/lib/libc/stdlib/random.c ============================================================================== --- head/lib/libc/stdlib/random.c Sun May 29 16:32:56 2016 (r300964) +++ head/lib/libc/stdlib/random.c Sun May 29 16:39:28 2016 (r300965) @@ -430,7 +430,7 @@ random(void) */ f = fptr; r = rptr; *f += *r; - i = (*f >> 1) & 0x7fffffff; /* chucking least random bit */ + i = *f >> 1; /* chucking least random bit */ if (++f >= end_ptr) { f = state; ++r;
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201605291639.u4TGdSwq032144>