https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118992
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #4)
> (In reply to H.J. Lu from comment #3)
> > The cse1 pass works on aarch64, but not on x86-64.
>
> It is the fwprop1 pass, not the cse1 pass.
It is due to hash_rtx in cse.cc:
if (regno >= FIRST_PSEUDO_REGISTER)
record = true;
else if (x == frame_pointer_rtx
|| x == hard_frame_pointer_rtx
|| x == arg_pointer_rtx
|| x == stack_pointer_rtx
|| x == pic_offset_table_rtx)
record = true;
else if (global_regs[regno])
record = false;
else if (fixed_regs[regno])
record = true;
else if (GET_MODE_CLASS (GET_MODE (x)) == MODE_CC)
record = true;
else if (targetm.small_register_classes_for_mode_p (GET_MODE (x)))
record = false;
else if (targetm.class_likely_spilled_p (REGNO_REG_CLASS (regno)))
record = false;
else
record = true;
if (!record)
{
*do_not_record_p = 1;
return 0;
}
If record is true, it works.
