> Here is the new patch that I am currently testing with your change and
> incorporating Eric's comment. I included both test cases but renamed
> yours and put it into gcc.dg/torture. Does the code in combine.c to
> address Eric's comment look OK to you?
>
> Steve Ellcey
> [email protected]
>
>
> 2015-10-21 Steve Ellcey <[email protected]>
> Andrew Pinski <[email protected]>
>
> * combine.c (simplify_comparison): Use gen_lowpart_or_truncate instead
> of gen_lowpart when we had a truncating and.
The patch is OK for mainline if testing succeeded and you remove the obsolete
last part of the comment:
Note that in:
(ne:DI (and:DI (reg:DI 4) (const_int 0xffffffff)) (const_int 0))
-> (ne:DI (reg:SI 4) (const_int 0))
unless TRULY_NOOP_TRUNCATION allows it or the register is
known to hold a value of the required mode the
transformation is invalid. */
--
Eric Botcazou
