From: Joseph Myers <joseph@codesourcery.com>
To: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Cc: <libc-alpha@sourceware.org>, <gabriel@inconstante.eti.br>,
<raji@linux.ibm.com>
Subject: Re: [PATCH 7/9] Refactor math-finite.h and introduce mathcalls-redir.h
Date: Wed, 06 Jun 2018 23:23:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.20.1806062312290.24720@digraph.polyomino.org.uk> (raw)
In-Reply-To: <20180606223909.16675-8-tuliom@linux.ibm.com>
On Wed, 6 Jun 2018, Tulio Magno Quites Machado Filho wrote:
> On a new enough compiler, redirecting the same function twice can cause
> -Werror=pragmas errors. This issue may appear when redirecting an ISO C
> floating point function to a different ABI at the same time that finite
> redirections are expected.
Does this issue already appear with -mlong-double-64? If so, it should
definitely be separated out from this patch series and have a bug filed in
Bugzilla as usual for anything fixing a bug that was user-visible in a
release.
The approach taken in this patch involves a lot of duplication of both
function prototypes and the feature-test-macro conditions on when those
functions are declared (duplicating them for functions not included in
math-finite.h, when previously only those in math-finite.h had such
duplication). Such duplication is, from experience, fragile and a bad
idea; the conditions and declarations are too likely to get out of sync.
Instead, I'd suggest merging bits/math-finite.h into bits/mathcalls.h as
much as possible - have macros such as __MATHCALL_FINITE that are called
in bits/mathcalls.h to declare the functions with __*_finite variants, and
with __MATHCALL_FINITE defined the same as __MATHCALL when the finite
function variants aren't in use. That way you have just a single
redirection for each function. (You'll need a sysdeps bits/ header for an
architecture, i.e. ia64, to declare it doesn't support the _finite
functions at all.)
--
Joseph S. Myers
joseph@codesourcery.com
next prev parent reply other threads:[~2018-06-06 23:23 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-06 22:41 [PATCH 0/9] Introduce ieee128 symbols and redirections Tulio Magno Quites Machado Filho
2018-06-06 22:41 ` [PATCH 4/9] ldbl-128ibm-compat: Add a generic significand() implementation Tulio Magno Quites Machado Filho
2018-06-07 13:38 ` Joseph Myers
2018-06-15 20:16 ` Tulio Magno Quites Machado Filho
2018-06-15 20:20 ` Tulio Magno Quites Machado Filho
2018-06-06 22:41 ` [PATCH 1/9] ldbl-128ibm-compat: Create libm-alias-float128.h Tulio Magno Quites Machado Filho
2018-06-06 23:05 ` Joseph Myers
2018-06-13 20:16 ` Tulio Magno Quites Machado Filho
2018-06-06 22:41 ` [PATCH 2/9] Move declare_mgen_finite_alias definition Tulio Magno Quites Machado Filho
2018-06-07 13:25 ` Joseph Myers
2018-06-06 22:41 ` [PATCH 3/9] ldbl-128ibm-compat: Provide a generic scalb implementation Tulio Magno Quites Machado Filho
2018-06-06 22:42 ` [PATCH 7/9] Refactor math-finite.h and introduce mathcalls-redir.h Tulio Magno Quites Machado Filho
2018-06-06 23:23 ` Joseph Myers [this message]
2018-06-13 21:36 ` Tulio Magno Quites Machado Filho
2018-06-13 22:58 ` Joseph Myers
2018-06-14 18:07 ` Tulio Magno Quites Machado Filho
2018-06-06 22:42 ` [PATCH 6/9] ldbl-128ibm-compat: Provide nexttoward functions Tulio Magno Quites Machado Filho
2018-06-06 22:42 ` [PATCH 8/9] ldbl-128ibm-compat: Redirect long double functions to f128/ieee128 functions Tulio Magno Quites Machado Filho
2018-06-06 22:42 ` [PATCH 5/9] ldbl-128ibm-compat: Provide ISO C functions not provided by the _Float128 API Tulio Magno Quites Machado Filho
2018-06-07 14:51 ` Joseph Myers
2018-06-13 21:41 ` Tulio Magno Quites Machado Filho
2018-06-06 22:43 ` [PATCH 9/9] ldbl-128ibm-compat: Redirect complex math functions Tulio Magno Quites Machado Filho
2018-06-06 23:11 ` [PATCH 0/9] Introduce ieee128 symbols and redirections Joseph Myers
2018-06-13 20:25 ` Tulio Magno Quites Machado Filho
2018-06-13 20:28 ` Joseph Myers
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.DEB.2.20.1806062312290.24720@digraph.polyomino.org.uk \
--to=joseph@codesourcery.com \
--cc=gabriel@inconstante.eti.br \
--cc=libc-alpha@sourceware.org \
--cc=raji@linux.ibm.com \
--cc=tuliom@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).