https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70676
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Target| |avr
Priority|P3 |P5
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2016-05-21
CC| |gjl at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
You missed to add a test case, cf. https://gcc.gnu.org/bugs/#need
> Can GCC in -Os really optimize only size and rollback optimizations
No, GCC usually won't "rollback" optimizations, and it won't perform
speculative optimizations.
There are cases where avr-gcc does not optimize sibling calls. Provided you
use -mrelax (or link with -Wl,--relax), the linker tries to replace [R]CALL+RET
by [R]JMP instruction. If there is a label at the }, i.e. between the CALL and
the RET, no optimization is possible.
