Date: Wed, 2 Apr 2003 17:59:05 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Bruce Evans <bde@zeta.org.au> Cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/ia64/include float.h Message-ID: <20030402075905.GA30835@cirb503493.alcatel.com.au> In-Reply-To: <20030402154250.X25489@gamplex.bde.org> References: <200303272038.h2RKcM7L096560@repoman.freebsd.org> <20030327204935.GA18134@HAL9000.homeunix.com> <20030330175646.281097ad.Alexander@Leidinger.net> <20030331082023.GE11307@cirb503493.alcatel.com.au> <20030401172440.701aaafd.Alexander@Leidinger.net> <20030401200457.GA30284@cirb503493.alcatel.com.au> <20030402154250.X25489@gamplex.bde.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Wed, Apr 02, 2003 at 04:21:30PM +1000, Bruce Evans wrote: >On Wed, 2 Apr 2003, Peter Jeremy wrote: > >> On Tue, Apr 01, 2003 at 05:24:40PM +0200, Alexander Leidinger wrote: >> >We noticed that icc does use other values for LDBL_MIN than we do, and >> >instead of just thinking that Intel does it right I wanted to verify it. > >This might be caused by icc actually understanding the target's default >precision for long doubles (FreeBSD changes the hardware default of 64-bit >to 53-bit for technical reasons). Is this also true on ia64? And the LDBL_* constants for sparc64 are for 113-bit fractions. I was going to mention this but thought it had changed since all the LDBL_* constants have been changed to 64-bit fraction values (they are 53-bit in -STABLE). Which is more wrong: LDBL_* constants that are "correct" but unusable because the CPU is set to "round to double" or LBDL_* constants that match the CPU rounding but not the compiler's "long double" type? >ucbtest is good but is too old to cover much of C99. I haven't found >anything anywhere near as good and up to date. I was also thinking of paranoia - which has been imported into gcc as enquire. It's even older than ucbtest and does a good job of generating all the float.h constants - but it doesn't check that the CPU actually implements IEEE arithmetic correctly. Peter
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030402075905.GA30835>