From: "Joseph S. Myers" <joseph@codesourcery.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Marek Polacek <polacek@redhat.com>,
GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] Implement -fsanitize=float-cast-overflow
Date: Thu, 15 May 2014 21:29:00 -0000 [thread overview]
Message-ID: <Pine.LNX.4.64.1405152124440.911@digraph.polyomino.org.uk> (raw)
In-Reply-To: <20140515190929.GQ10386@tucnak.redhat.com>
On Thu, 15 May 2014, Jakub Jelinek wrote:
> But I think we can't use decimal_real_from_string, we'd need a variant
> of that function that would allow specification of the rounding mode
My point is that you can use "%.*RUe" or "%.*RDe" formats (for max and min
respectively), with an appropriate precision, and let MPFR do the rounding
to an appropriate number of decimal digits in the right direction (to
produce a value that's exactly representable in the relevant DFP type, as
long as it's in range).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2014-05-15 21:29 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-13 17:08 Marek Polacek
2014-05-13 17:38 ` Jakub Jelinek
2014-05-13 18:11 ` Joseph S. Myers
2014-05-14 11:38 ` Jakub Jelinek
2014-05-14 17:37 ` Joseph S. Myers
2014-05-15 19:09 ` Jakub Jelinek
2014-05-15 21:29 ` Joseph S. Myers [this message]
2014-05-16 7:37 ` Jakub Jelinek
2014-05-16 15:54 ` Joseph S. Myers
2014-05-20 20:33 ` [PATCH] Implement -fsanitize=float-cast-overflow (take 2) Marek Polacek
2014-05-20 21:50 ` Joseph S. Myers
2014-05-21 12:51 ` Marek Polacek
2014-05-21 14:46 ` Jakub Jelinek
2014-05-21 18:52 ` Jakub Jelinek
2014-05-22 8:06 ` [PATCH] Fix LTO decimal ICE Jakub Jelinek
2014-05-21 17:50 ` [PATCH] Implement -fsanitize=float-cast-overflow (take 2) Joseph S. Myers
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