https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70461
Vladimir Makarov <vmakarov at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |vmakarov at gcc dot gnu.org
--- Comment #1 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Alexander Fomin from comment #0)
> Created attachment 38134 [details]
> A reproducer
>
> When trying to compile the attached reproducer with -m32 -O2 -march=core-avx2
> we generate 12 extra instructions (namely spills & fills) for the hot loop
> since r234527.
Thank you for finding this out.
I am confirming that the revision resulted in the code worsening. The problem
is in using a wrong cost (65535) in saving calculations. Such cost is for AREG
in DImode. This cost is defined when the class (AREG) has not enough registers
to hold a value in given mode (DImode).
I hope the patch will be ready today or tomorrow.
