[Bug libc/535] difftime double-rounding bug if 64-bit time_t and long double=double

["cvs-commit at gcc dot gnu dot org" <sourceware-bugzilla at sources dot redhat dot com>]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-11-11 22:31 -------
Subject: Bug 535

CVSROOT:	/cvs/glibc
Module name:	libc
Changes by:	roland@sources.redhat.com	2004-11-11 22:30:57

Modified files:
	time           : difftime.c 

Log message:
	2004-11-09  Paul Eggert  <eggert@cs.ucla.edu.
	
	[BZ #535]
	* time/difftime.c: Fix a double-rounding bug on hosts with
	64-bit time_t and long double being IEEE double.  Also, port
	to more valid C99 hosts, even those that have padding bits.
	Don't include <values.h> since it is marked as an obsolescent
	interface.  Include <limits.h>, <float.h>, and <stdint.h> instead.
	(TYPE_BITS, TYPE_FLOATING, TYPE_SIGNED): New macros.
	(subtract): New static function, that works correctly without
	double-rounding, even on hosts with 64-bit time_t.  Also cater
	to hosts with padding bits.
	(__difftime): Use it.  Use DBL_MANT_DIG and LDBL_MANT_DIG to
	determine whether floating types are wide enough: the old
	test (which used sizeof) could in theory report the wrong results
	on hosts with padding bits in floating-point values.

Patches:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/time/difftime.c.diff?cvsroot=glibc&r1=1.7&r2=1.8



-- 


http://sources.redhat.com/bugzilla/show_bug.cgi?id=535

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