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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/106165] incorrect result when using inlined asm implementation of floor() on i686
Date: Wed, 06 Jul 2022 00:44:52 +0000	[thread overview]
Message-ID: <bug-106165-4-calbKqpU8J@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-106165-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106165

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to xeioex from comment #3)
> Is there a portable (across platforms and compilers) to ensure that double
> values are always 64 bits?

It is still 64bit storage on i686, just uses the excessive precission while
doing calculations.
You should read "What Every Computer Scientist Should Know About Floating-Point
Arithmetic": https://www.itu.dk/~sestoft/bachelor/IEEE754_article.pdf about
this and all.

  parent reply	other threads:[~2022-07-06  0:44 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-02  1:30 [Bug c/106165] New: " xeioexception at gmail dot com
2022-07-02  2:06 ` [Bug target/106165] " xeioexception at gmail dot com
2022-07-02  2:09 ` pinskia at gcc dot gnu.org
2022-07-06  0:34 ` xeioexception at gmail dot com
2022-07-06  0:44 ` pinskia at gcc dot gnu.org [this message]
2022-07-06  1:00 ` xeioexception at gmail dot com
2022-10-14  9:47 ` vincent-gcc at vinc17 dot net

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