https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65693
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, the RA issue is hard to deal with, there is a local register var that
uses a register some instruction needs while the local register is live.
Anyway, this alloca/VLA division issue is what I meant to fix with PR65220, but
here unfortunately the RTL cprop isn't performed because the function has a
single basic block and for some reason RTL cprop doesn't perform even the local
cprop subpass then.
And, at combine time, combiner attempts to simplify the insn, so the
*udivmod<mode>4_pow2 pattern no longer matches.
One possibility to fix this would be to add *udivmod<mode>4_pow2_1 pattern that
would just have the lshiftrt and and instructions in PARALLEL until reload,
then split them.
