[Bug c/106981] [10/11/12/13 Regression][OpenACC][OpenMP] ICE in decompose, at wide-int.h:984 with '#pragma omp/acc atomic capture'

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106981

--- Comment #6 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #5)

> The fix could be either partially backport what C++ FE did in
> --- gcc/c/c-typeck.cc.jj	2022-09-23 09:02:56.525318361 +0200
> +++ gcc/c/c-typeck.cc	2022-09-23 10:33:06.596467788 +0200

> +  if (CONSTANT_CLASS_P (t1) && !comptypes (TREE_TYPE (t1), TREE_TYPE (t2)))
> +    return false;

Maybe. Though I think we still need something like my:

+       if (n > TREE_OPERAND_LENGTH (t2))
+         return false;

(With ">" not ">=" as I accidentally had.)
Given that 
          if (!c_tree_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i)))
does not make sense when exceeding the operand length!

Nonetheless, ...

> Now, wonder what will break if I just strip same type casts and
> for others like in C++ require same type.

sounds like a reasonable approach,.