This is the mail archive of the libstdc++@gcc.gnu.org mailing list for the libstdc++ project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

[PATCH] Use built-in for std::make_integer_sequnce

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Mon, 18 Sep 2017 13:04:55 +0100
Subject: [PATCH] Use built-in for std::make_integer_sequnce
Authentication-results: sourceware.org; auth=none
Authentication-results: ext-mx04.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com
Authentication-results: ext-mx04.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=jwakely at redhat dot com
Dmarc-filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 98F0980474

I forgot to commit this patch at the start of stage 1 when Jason added
the __integer_pack builtin.

This patch uses __has_builtin to detect Clang's __make_integer_seq
builtin and uses that instead when available. This means it works with
either __integer_pack or __make_integer_seq. whichever is available.

We _could_ keep the old implementation, for compilers that don't
support either builtin (I'm not sure if Intel icc supports either) but
I haven't done that here.

	* include/std/utility (_Itup_cat, _Make_integer_sequence): Remove.
	(_Build_index_tuple, make_integer_sequence): Use built-in to generate
	pack expansion.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]