[Bug target/66697] Feature request: -mstackrealign and force_align_arg_pointer for x86_64

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66697

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #36450|0                           |1
        is obsolete|                            |

--- Comment #16 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 36453
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36453&action=edit
V3 patch that enables force_align_arg_pointer attribute for x86_64 targets

Slightly updated V2 patch. Now REG_CFA_EXPRESSION note is attached to an
unaligned store insn instead of REG_FRAME_RELATED_EXPR note.

This is the patch in testing.
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From: "dragonroot at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67870] New: ICE: in type_throw_all_p, at cp/except.c:1306
Date: Tue, 06 Oct 2015 17:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idg870

            Bug ID: 67870
           Summary: ICE: in type_throw_all_p, at cp/except.c:1306
           Product: gcc
           Version: 4.9.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dragonroot at gmail dot com
  Target Milestone: ---

The following code snippet makes the compiler ICE. Affects at least 4.8.2 and
4.9.3. Does not seem to affect 5.x. Compile with --std=c++11

=================================================
#include <type_traits>

template< class T >
struct Tmpl
{
  ~Tmpl() noexcept( std::is_nothrow_destructible< T >::value )
  {}
};

struct Empty
{
};

struct Foo
{
  ~Foo()
  {}

  Tmpl< Empty > member;
};

int main()
{
}

=================================================
Live snippet to play with: http://melpon.org/wandbox/permlink/6vmp1P7Ppwzjk1kh