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Re: [PATCH][Fortran][v2] Use MIN/MAX_EXPR for min/max intrinsics

From: Joseph Myers <joseph at codesourcery dot com>
To: Janne Blomqvist <blomqvist dot janne at gmail dot com>
Cc: Thomas König <tk at tkoenig dot net>, Kyrill Tkachov <kyrylo dot tkachov at foss dot arm dot com>, Thomas Koenig <tkoenig at netcologne dot de>, Richard Biener <richard dot guenther at gmail dot com>, "fortran at gcc dot gnu dot org" <fortran at gcc dot gnu dot org>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 26 Jul 2018 20:35:59 +0000
Subject: Re: [PATCH][Fortran][v2] Use MIN/MAX_EXPR for min/max intrinsics
References: <5B4DE283.9060100@foss.arm.com> <CAFiYyc2F_H1bSCQg+caLQr8WnqExtkAVyAhaQMky_HbZCC=5hQ@mail.gmail.com> <5B4DF325.2050609@foss.arm.com> <9d0cf3dc-8c5c-bbb2-960c-386b2c936a50@netcologne.de> <CAO9iq9GYUswbCaU0_WOZ5tppNY7RU7mF26gEqA19F8aWMJtqvw@mail.gmail.com> <CAO9iq9HGgS5rXuHOVqY6F_uBGE8uakiLd5SMQEK3eenCC=EaTA@mail.gmail.com> <5B4F21E0.3060307@foss.arm.com> <2AD7441E-7E57-47EC-9073-92375938B8B8@tkoenig.net> <CAO9iq9G7rSWCFMkTam2uOAsuW9WBGJL607C4FtAeXqVh7th-Pw@mail.gmail.com>

On Wed, 18 Jul 2018, Janne Blomqvist wrote:

> minimumNumber(a, NaN) = minimumNumber(NaN, a) = a
> 
> That is minimumNumber corresponds to minnum in IEEE 754-2008 and fmin* in

No, it differs in the handling of signaling NaNs (with minimumNumber, if 
the NaN argument is signaling, it results in the "invalid" exception but 
the non-NaN argument is still returned, whereas with minNum, a quiet NaN 
was returned in that case).  A new fminimum_num function is proposed as a 
C binding to the new operation.

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2273.pdf

(The new operations are also more strictly defined regarding zero 
arguments, to treat -0 as less than +0, which was unspecified for minNum 
and fmin.)

-- 
Joseph S. Myers
joseph@codesourcery.com

References:
- [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Kyrill Tkachov
- Re: [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Richard Biener
- Re: [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Kyrill Tkachov
- Re: [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Thomas Koenig
- Re: [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Janne Blomqvist
- Re: [PATCH][Fortran] Use MIN/MAX_EXPR for intrinsics or __builtin_fmin/max when appropriate
  - From: Janne Blomqvist
- [PATCH][Fortran][v2] Use MIN/MAX_EXPR for min/max intrinsics
  - From: Kyrill Tkachov
- Re: [PATCH][Fortran][v2] Use MIN/MAX_EXPR for min/max intrinsics
  - From: Thomas König
- Re: [PATCH][Fortran][v2] Use MIN/MAX_EXPR for min/max intrinsics
  - From: Janne Blomqvist

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