[Bug tree-optimization/65519] [5 regression] unable to coalesce ssa_names 2 and 87 which are marked as MUST COALESCE

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65519

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 35121
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35121&action=edit
patch

gimple-fold works like fold - it tries to re-simplify what you feed it, but
only
the outermost level (so it doesn't really recurse).  Still I think this bug
needs changing code-generation like with the attached patch which I am testing
right now.

I always forget how to force SJLJ EH on x86_64-linux for ada so I didn't manage
to reproduce the issue or check if the patch fixes it ...