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

[rguenth at gcc dot gnu.org via Gcc-bugs]

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.