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From: "Andrey A. Chernov" <ache@FreeBSD.org>
Date: Sun, 29 May 2016 16:39:28 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r300965 - head/lib/libc/stdlib
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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;