[Bug c++/103326] New: constexpr crashing when uses with vector extensions

[Bug c++/103326] New: constexpr crashing when uses with vector extensions

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103326

            Bug ID: 103326
           Summary: constexpr crashing when uses with vector extensions
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

using x86_64_v16qi [[gnu::__vector_size__ (16)]] = char;

template<typename T>
void foo()
{
        constexpr x86_64_v16qi zero{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0};
}

void foo2()
{
        foo<int>();
}

D:\hg\fast_io\.tmp>g++ -S simd_constexpr_crashing.cc -Ofast -std=c++20
-march=native -I../include
simd_constexpr_crashing.cc: In instantiation of 'void foo() [with T = int]':
simd_constexpr_crashing.cc:11:10:   required from here
simd_constexpr_crashing.cc:6:32: internal compiler error: in tsubst_copy, at
cp/pt.c:17303
    6 |         constexpr x86_64_v16qi zero{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0};
      |                                ^~~~
libbacktrace could not find executable to open
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.

[Bug c++/103326] constexpr crashing when uses with vector extensions

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103326

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org
   Last reconfirmed|                            |2021-11-19
           Keywords|                            |ice-on-valid-code
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

#1  0x0000000000e6c39a in tsubst_copy (t=<vector_cst 0x7ffff66b9be8>, 
    args=<tree_vec 0x7ffff66c43c0>, complain=3, 
    in_decl=<template_decl 0x7ffff66c0000 foo>)
    at /home/rguenther/src/gcc3/gcc/cp/pt.c:17303
17303           gcc_unreachable ();

I think I have a simple patch.

[Bug c++/103326] constexpr crashing when uses with vector extensions

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103326

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:dd85c42c36a5d4e00b41ed40bca98598a2fb57c5

commit r12-5398-gdd85c42c36a5d4e00b41ed40bca98598a2fb57c5
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Nov 19 08:54:18 2021 +0100

    c++/103326 - fix ICE in tsubst with VECTOR_CST

    This adds missing handling of VECTOR_CST.

    2021-11-19  Richard Biener  <rguenther@suse.de>

            PR c++/103326
            * pt.c (tsubst_copy): Handle VECTOR_CST.

            * g++.dg/pr103326.C: New testcase.

[Bug c++/103326] constexpr crashing when uses with vector extensions

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103326

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.  On branches this is hidden behind checking and it doesn't seem
to be a regression.