[Bug middle-end/103406] [12 Regression] gcc -O0 behaves differently on "DBL_MAX related operations" than gcc -O1 and above

[roger at nextmovesoftware dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103406

Roger Sayle <roger at nextmovesoftware dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |roger at nextmovesoftware dot 
com
           Assignee|unassigned at gcc dot gnu.org      |roger at 
nextmovesoftware dot com
             Status|NEW                         |ASSIGNED

--- Comment #7 from Roger Sayle <roger at nextmovesoftware dot com> ---
I'm currently bootstrapping and regression testing this fix:
 (simplify
  (minus @0 @0)
- (if (!FLOAT_TYPE_P (type) || !tree_expr_maybe_nan_p (@0))
+ (if (!FLOAT_TYPE_P (type)
+      || (!tree_expr_maybe_nan_p (@0)
+         && !tree_expr_maybe_infinite_p (@0)))
   { build_zero_cst (type); }))