From: "Willgerodt, Felix" <felix.willgerodt@intel.com>
To: Luis Machado <luis.machado@linaro.org>,
"gdb-patches@sourceware.org" <gdb-patches@sourceware.org>
Subject: RE: [PATCH 2/2] gdb: Enable finish command and inferior calls for _Float16 on amd64 and i386.
Date: Fri, 30 Jul 2021 07:52:51 +0000 [thread overview]
Message-ID: <DM8PR11MB5733626B5BD0043AD2AA8FBF8EEC9@DM8PR11MB5733.namprd11.prod.outlook.com> (raw)
In-Reply-To: <64bffa82-0520-d0aa-786b-4d81142b977f@linaro.org>
> Is _Float16 equivalent to fp16? If so, the presence of yet another name for a
> fp16 type is a bit unfortunate.
>
They are the same usually, but on ARM the story is apparently a bit more complex:
https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html
But to cite the link:
" The __fp16 type may only be used as an argument to intrinsics defined in
<arm_fp16.h>, or as a storage format."
And:
"It is recommended that portable code use the _Float16 type defined by
ISO/IEC TS 18661-3:2015."
Therefore I don't think it is that unfortunate and not really negotiable by now.
Both GCC and clang know about both already.
> > - if (type->code () == TYPE_CODE_FLT)
> > + /* _FLoat16 and _Float16 _Complex values are returned via xmm0. */
>
> _Float16
>
Thanks for spotting this. I fixed it locally.
> > +/* Test program for bfloat16 of AVX 512 registers.
>
> float16 and not bfloat16, right?
>
Thanks. I reworded it to say:
"Test program for _Float16 parameters and return values."
Regards,
Felix
Intel Deutschland GmbH
Registered Address: Am Campeon 10, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de <http://www.intel.de>
Managing Directors: Christin Eisenschmid, Sharon Heck, Tiffany Doon Silva
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Registered Office: Munich
Commercial Register: Amtsgericht Muenchen HRB 186928
next prev parent reply other threads:[~2021-07-30 7:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-29 8:38 [PATCH 0/2] Add AVX512-FP16 support Felix Willgerodt
2021-07-29 8:38 ` [PATCH 1/2] Add half support for AVX512 register view Felix Willgerodt
2021-09-03 12:30 ` Simon Marchi
2021-09-03 12:55 ` Willgerodt, Felix
2021-09-03 12:59 ` Simon Marchi
2021-07-29 8:38 ` [PATCH 2/2] gdb: Enable finish command and inferior calls for _Float16 on amd64 and i386 Felix Willgerodt
2021-07-29 16:03 ` Luis Machado
2021-07-30 7:52 ` Willgerodt, Felix [this message]
2021-07-30 12:04 ` Luis Machado
2021-09-03 12:37 ` Simon Marchi
2021-09-03 14:00 ` Willgerodt, Felix
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