From: Joseph Myers <joseph@codesourcery.com>
To: Michael Meissner <meissner@linux.ibm.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>,
Bill Schmidt <wschmidt@linux.ibm.com>,
David Edelsohn <dje.gcc@gmail.com>, <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH 2/3 V2] Do not include stdio.h in libgcc's Decimal/Float128 conversions.
Date: Wed, 3 Mar 2021 23:33:52 +0000 [thread overview]
Message-ID: <alpine.DEB.2.22.394.2103032328480.426551@digraph.polyomino.org.uk> (raw)
In-Reply-To: <20210303191256.GA29681@ibm-toto.the-meissners.org>
On Wed, 3 Mar 2021, Michael Meissner via Gcc-patches wrote:
> As we have discussed many times, on 32-bit BE, you cannot use hardware
> _Float128 support on power9/power10 because there is no TImode in 32-bit.
> Various machine independent parts of GCC require an integer type to be the same
> size as basic types. If somebody made TImode work, we can remove the
> restriction and allow _Float128 to work on 32-bit.
I'm not sure exactly what the machine-independent requirement is, but
_Float128 is supported for 32-bit x86, riscv, sparc and s390 at least.
There's no support for _Float128 in the 32-bit powerpc ABI, but I don't
think there is anything architecture-independent preventing such support
on 32-bit platforms where TImode is unsupported (i.e. not supported by the
scalar_mode_supported_p hook).
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2021-03-03 23:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 17:14 [PATCH 0/3 V2] Honor --disable-decimal-float in PowerPC libgcc _Float128 Michael Meissner
2021-03-01 17:17 ` [PATCH 1/3 V2] Fix __sprintfkf prototype in libgcc Michael Meissner
2021-03-01 22:37 ` Segher Boessenkool
2021-03-01 17:18 ` [PATCH 2/3 V2] Do not include stdio.h in libgcc's Decimal/Float128 conversions Michael Meissner
2021-03-01 23:15 ` Segher Boessenkool
2021-03-02 21:25 ` Michael Meissner
2021-03-02 21:53 ` Segher Boessenkool
2021-03-03 19:12 ` Michael Meissner
2021-03-03 23:33 ` Joseph Myers [this message]
2021-03-04 1:01 ` Michael Meissner
2021-03-09 18:35 ` Segher Boessenkool
2021-03-01 17:19 ` [PATCH 3/3 V2] Do not build Decimal/Float128 conversions if decimal is disabled Michael Meissner
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