https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64010
Ulrich Weigand <uweigand at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |uweigand at gcc dot gnu.org
--- Comment #4 from Ulrich Weigand <uweigand at gcc dot gnu.org> ---
Yes, this seems a generic reload bug. The comment ahead of the lines you're
adding say:
If [...] the operand contains a register that dies in this insn *and is used
nowhere else* [...]
which is supposed to be implemented by this check:
&& ! refers_to_regno_for_reload_p (regno,
end_hard_regno (rel_mode,
regno),
PATTERN (this_insn), inloc)
But this doesn't look into registers used as function arguments.
I'm not sure why this hasn't occured elsewhere ... however, in your particular
case, it is triggered by a call insn pattern using memory-indirect addressing,
which is probably not available on many targets.
Your patch is a little too conservative, however: it rejects any register that
could potentially be used as function argument, even if it isn't actually used
in this particular call.
Can you check whether this alternative patch (using find_reg_fusage) also fixes
the problem for you?
