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Re: [Patch,AVR] Fix PR46278, Take #3
Weddington, Eric schrieb:
>> This is yet another attempt to fix PR46278 (fake X addressing).
>> After the previous clean-ups it is just a small change.
>> caller-saves.c tries to eliminate call-clobbered hard-regs allocated to
>> pseudos around function calls and that leads to situations that reload is
>> no more capable to perform all requested spills because of the very few
>> AVR's address registers.
>> Thus, the patch adds a new target option -mstrict-X so that the user can
>> turn that option if he like to do so, and then -fcaller-save is disabled.
>> The patch passes the testsuite without regressions. Moreover, the
>> testsuite passes without regressions if all test cases are run with
>> -mstrict-X and all libraries (libgcc, avr-libc) are built with the new
>> option turned on.
> Hi Johann,
> Sorry, I haven't been keeping up with the discussion on this PR.
> But if all test cases pass with running -mstrict-X and everything built with
> that option on, then why is this even an option? Is it because that it may
> not always reduce code size?...
An alternative would be to set -mstrict-X per default if -O or higher.
Let's see what Denis thinks.
> Thanks, Eric