[Bug c/65881] New: no documentation of __uint128_t

[Bug c/65881] New: no documentation of __uint128_t

[shawn at churchofgit dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65881

            Bug ID: 65881
           Summary: no documentation of __uint128_t
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: shawn at churchofgit dot com

gcc on x86_64 recognizes __uint128_t, but this is not documented along with
__int128, also there is no warning when a target does not support __uint128_t,
like there is with __int128:

triangle64.c:32:1: error: ‘__int128’ is not supported for this target

A unsigned 128-bit type is needed because it has defined integer overflow.
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Subject: [Bug target/65871] bzhi builtin/intrinsic wrongly assumes bzhi instruction doesn't set the ZF flag
Date: Sat, 25 Apr 2015 05:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide871

--- Comment #1 from James Almer <jamrial at gmail dot com> ---
The same apparently happens with bextr, blsi, blsr, and most (if not all) of
AMD's tbm instructions. They set the ZF flag but gcc still generates a test
instruction.

http://www.felixcloutier.com/x86/BEXTR.html
http://www.felixcloutier.com/x86/BLSI.html
http://www.felixcloutier.com/x86/BLSR.html
http://support.amd.com/TechDocs/24594.pdf

[Bug c/65881] no documentation of __uint128_t

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65881

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Shawn Landden from comment #0)
> gcc on x86_64 recognizes __uint128_t, but this is not documented along with
> __int128, also there is no warning when a target does not support
> __uint128_t, like there is with __int128:
> 
> triangle64.c:32:1: error: ‘__int128’ is not supported for this target

e.c:2:3: error: unknown type name ‘__uint128_t’
   __uint128_t i=42;
   ^

> A unsigned 128-bit type is needed because it has defined integer overflow.

https://gcc.gnu.org/onlinedocs/gcc/_005f_005fint128.html
That type is called "unsigned __int128". The other aliases are only for
compatibility or legacy.
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Subject: [Bug c++/65880] [5/6 Regression] Member function issue with argument "pointer to const array of member function pointers"
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide880

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-25
            Summary|Member function issue with  |[5/6 Regression] Member
                   |argument "pointer to const  |function issue with
                   |array of member function    |argument "pointer to const
                   |pointers"                   |array of member function
                   |                            |pointers"
     Ever confirmed|0                           |1
      Known to fail|                            |6.0

[Bug c/65881] no documentation of __uint128_t

[shawn at churchofgit dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65881

Shawn Landden <shawn at churchofgit dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Shawn Landden <shawn at churchofgit dot com> ---
> unsigned __int128