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From: Vincent Lefevre <vincent+gcc@vinc17.org>
To: Liu Hao <lh_mouse@126.com>, Andrew Haley <aph@redhat.com>,
	Neha Gowda <neha.gnu.gcc@gmail.com>,
	gcc-help@gcc.gnu.org
Subject: Re: Should rand() return a RAND_MAX value for 32 bit target?
Date: Sat, 22 Sep 2018 10:08:00 -0000	[thread overview]
Message-ID: <20180922100819.GA32380@zira.vinc17.org> (raw)
In-Reply-To: <20180922081704.GA25565@zira.vinc17.org>

On 2018-09-22 10:17:04 +0200, Vincent Lefevre wrote:
> Thus if one does
> 
>   float a;
>   int b;
> 
>   /* ... */
>   a + b;
> 
> with FLT_EVAL_METHOD = 2, the evaluation type of a is long double, b
> is converted to the semantic type float, but its evaluation type is
> long double, so that its value should not change if representable as
> a long double. That's what FLT_EVAL_METHOD means. The *only* cases
> for which the precision and range need to be reduced to those of the
> semantic type if for assignment and cast, but here one just has an
> implicit conversion.

Bug reported here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87390
(note that the tests do not involve constants, these are just about
implicit type conversions).

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

  reply	other threads:[~2018-09-22 10:08 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-18 12:22 Neha Gowda
2018-09-18 13:09 ` Xi Ruoyao
2018-09-18 13:17   ` Xi Ruoyao
2018-09-18 13:49   ` Jonathan Wakely
2018-09-18 13:46 ` Andrew Haley
2018-09-20 14:42   ` Vincent Lefevre
2018-09-20 15:05     ` Vincent Lefevre
2018-09-20 15:21       ` Liu Hao
2018-09-20 15:58         ` Vincent Lefevre
2018-09-20 16:12           ` Vincent Lefevre
2018-09-21  2:49           ` Liu Hao
2018-09-22  8:17             ` Vincent Lefevre
2018-09-22 10:08               ` Vincent Lefevre [this message]
2018-09-22 13:52                 ` Liu Hao
2018-09-22 22:12                   ` Vincent Lefevre
2018-09-20 15:46       ` Dennis Clarke
2018-09-20 16:16         ` Vincent Lefevre

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