This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

ARM patch: Fix PR 40697


The ARM andsi3 expander has code to detect a case where, when generating
Thumb1 code, we can perform an AND by a sequence of two shifts.
Unfortunately, this code never triggers, as avoid_expensive_constant in
optabs.c prevents the expander from ever seeing a constant.

Fixed by tweaking the rtx costs.  Regression tested on arm-elf{,mthumb}.
 Ok (possibly for 4.6)?


Bernd

Attachment: thumb-andsi.diff
Description: Text document


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]