https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91796
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |hjl.tools at gmail dot com,
| |jakub at gcc dot gnu.org,
| |uros at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The #c0 issue is a RA decision, what registers it decides to use for each
pseudo register.
As for #c1, the optimizers see that what you've typed there is a constant and
optimizes it into a constant (which is desirable). Whether that particular
constant is better loaded into a register using a memory load or two
instructions depends on various factors, we obviously have special cases for
constants that can be built using a single non-memory instruction (e.g. zero
vector or all ones vector), whether to do that for other constant is something
that needs to be thought out, benchmarked etc.
