From: Joseph Myers <joseph@codesourcery.com>
To: Michael Meissner <meissner@linux.vnet.ibm.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>,
Segher Boessenkool <segher@kernel.crashing.org>,
David Edelsohn <dje.gcc@gmail.com>,
Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Subject: Re: [PATCH, version 2], Add support for _Float<N> and _Float<N>X sqrt, fma, fmin, fmax built-in functions
Date: Thu, 19 Oct 2017 23:08:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1710192304440.9397@digraph.polyomino.org.uk> (raw)
In-Reply-To: <20171019230035.GA1627@ibm-tiger.the-meissners.org>
On Fri, 20 Oct 2017, Michael Meissner wrote:
> On Thu, Oct 19, 2017 at 10:15:44PM +0000, Joseph Myers wrote:
> > On Thu, 19 Oct 2017, Michael Meissner wrote:
> >
> > > 1) I switched to use DEF_EXT_LIB_BUILTIN to declare the _Float<N> and
> > > _Float<N>X functions. This allows treating __builtin_sqrtf128 the same
> > > as sqrtf128.
> >
> > It's not correct to do that unconditionally for all the existing
> > DEF_GCC_FLOATN_NX_BUILTINS functions. There should not be a public
> > huge_valf128 function any more than a public huge_val function, just
> > __builtin_huge_valf128.
> >
> > Rather, you should add a new DEF_EXT_LIB_FLOATN_NX_BUILTINS. It should be
> > used by the new functions, and by the existing copysign / fabs / nan
> > functions. It should not be used by the existing huge_val / inf / nans
> > functions.
>
> Ok. Would an initial patch to go back to using DEF_GCC_BUILTIN (which means
> people would need to use __builtin_sqrtf128 and __builtin_fmaf128) be
> acceptable, while I delve into the appropriate incantations to get it to work
> as desired be ok?
My argument was that *if* you provide __FP_FAST_FMAF128 (etc.), that
should relate to an fmaf128 (etc.) built-in function. If you don't define
__FP_FAST_*, doing everything with DEF_GCC_BUILTIN would be reasonable as
a starting point (with a view to moving selected functions to
DEF_EXT_LIB_BUILTIN and defining __FP_FAST_* in a subsequent patch, and
subject to calls still falling back to call the right external functions,
e.g. sqrtf128 to deal with the errno-setting case of __builtin_sqrtf128).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2017-10-19 23:07 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 21:46 [PATCH], Add support for __builtin_{sqrt,fma}f128 on PowerPC ISA 3.0 Michael Meissner
2017-09-13 22:49 ` Joseph Myers
2017-09-14 19:02 ` Michael Meissner
2017-10-19 22:15 ` [PATCH, version 2], Add support for _Float<N> and _Float<N>X sqrt, fma, fmin, fmax built-in functions Michael Meissner
2017-10-19 23:00 ` Joseph Myers
2017-10-19 23:00 ` Michael Meissner
2017-10-19 23:08 ` Joseph Myers [this message]
2017-10-24 22:40 ` [PATCH, version 3], " Michael Meissner
2017-10-24 23:13 ` Joseph Myers
2017-10-24 23:58 ` Michael Meissner
2017-10-25 19:25 ` [PATCH, version 4], " Michael Meissner
2017-10-25 20:01 ` Michael Meissner
2017-10-25 20:11 ` Joseph Myers
2017-10-25 20:31 ` Michael Meissner
2017-10-25 20:50 ` Joseph Myers
2017-10-25 23:37 ` [PATCH, version 5], " Michael Meissner
2017-10-25 23:56 ` Joseph Myers
2017-10-26 0:04 ` [PATCH, version 5a], " Michael Meissner
2017-10-26 0:17 ` Michael Meissner
2017-10-30 16:29 ` Joseph Myers
2017-10-30 18:05 ` Michael Meissner
2017-10-30 18:38 ` Joseph Myers
2017-10-30 23:06 ` Michael Meissner
2017-10-30 23:29 ` Michael Meissner
2017-10-30 23:35 ` Joseph Myers
2017-10-30 23:48 ` Michael Meissner
2017-10-31 18:04 ` Michael Meissner
2017-10-31 18:26 ` Joseph Myers
2017-10-27 2:27 ` Segher Boessenkool
2017-09-14 14:54 ` [PATCH], Add support for __builtin_{sqrt,fma}f128 on PowerPC ISA 3.0 Segher Boessenkool
2017-09-14 22:21 ` Michael Meissner
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