https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90292
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |amonakov at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
The compiler cannot perform this hoisting, because the computation 'n*(i) +
(j)' happens in 'unsigned int' type, where wrapping overflow matters when
pointers are 64-bit.
If the testcase is changed to either use 'int' (undefined overflow) or
'unsigned long' (same as pointer size), the desired hoisting is performed, as
far as I can tell. Therefore, closing as invalid.
(it's not rare that using size_t for array indexes helps optimization, this is
one of such examples)
