[Bug tree-optimization/83126] [8 Regression] ICE in transform_to_exit_first_loop_alt, at tree-parloops.c:1713

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83126

--- Comment #8 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 43476
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43476&action=edit
Tentative patch

(In reply to rguenther@suse.de from comment #3)

> This is the usual "you should not repeat analysis during transform" issue.
> The vectorizer gets around this by caching relevant scalar evolution
> but obviously that's difficult if using generic stuff like
> canonicalize_loop_ivs ...

This patch caches affine_iv info before calling loop_version, and then uses
that cached info in canonicalize_loop_ivs. This fixes the ICE.