Re: error in finding a register to spill

[Shinpei Kato <shinny at j02 dot itscom dot net>]

Hi, thanks for a reply.

>You said you have only one status register.  In that case, using a hard
>register is a much better choice than using a pseudo.  If you use a
>pseudo, then the compiler assumes there are an infinite number of them,
>and then later when it tries to map them onto one hard register, you
>will likely get poor code because of all of the spills required.  You
>can avoid this by using a hard register in the first place.  See for
>instance the mips port.  It uses a hard reg if there is only one status
>register, and a pseudo is there are 8 status registers.

Yes I thought it would be better to use a hard register instead of a pseudo.
But I didn't know how to do that...
First of all, I changed "sge_df" like,

*******************************************
(define_insn "sge_df"
  [set (reg:CC 39)
       (ge:CC (match_opernad:DF 0 "register_operand" "f")
              (match_opernad:DF 1 "register_operand" "f")))]
  "TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
  "c.le.d\t%1, %0"
  [(set_attr  "type"  "fcmp")
   (set_attr  "mode"  "FPSW")])
*******************************************

Is this nearly what you meant?
Here note that c.le.d takes 2 operands which are source & target and the result of comparison is stored into $f7 automatically by hardware.

After modifying as above, I compiled successfully though another error occured in the insn called "branch_fp"...
This error is also about finding a register to spill so I hope I could overcome it by the same way.

Regards,
Shinpei