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Re: How can I add 256bits register file to a MIPS port?
2010/12/21 Ian Lance Taylor <iant@google.com>:
> Liu <proljc@gmail.com> writes:
>
>> ? ? ? I need add 256bits-register support for our MIPS-based
>> processor, so I add some codes.
>> ? ? ? When I build gcc and test it, get a error "unable to find a
>> register to spill in class 'XX_REGS'"
>> ? ? ? can you tell me how to add 256bits register file to a MIPS port?
>>
>> Thanks!
>>
>> codes:
>> gcc/config/mips/constraints.md :
>> (define_register_constraint 'Z' 'XX_REGS'
>> ? '@internal')
>>
>> gcc/config/mips/mips-ftypes.def :
>> DEF_MIPS_FTYPE (2, (UV32QI, UV32QI, UV32QI))
>> DEF_MIPS_FTYPE (2, (V32QI, V32QI, V32QI))
>>
>> gcc/config/mips/mips.h :
>> #define FIXED_REGISTERS
>> ? /* XX regusters */ ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? \
>> ?1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ? ? ? ? ? ? ? ? ? ? ?\
>> ? 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ? ? ? ? ? ? ? ? ? ? \
>> ? 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ? ? ? ? ? ? ? ? ? ? \
>> ? 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 ? ? ? ? ? ? ? ? ? ? ?\
>
> Setting them all as 1 in FIXED_REGISTERS means that gcc can't use them.
>
> Ian
>
Thank you for reply.
I changed FIXED_REGISTERS into 0, FIXED_REGISTERS into 1,
CALL_REALLY_USED_REGISTERS into 1.
build and test it, but I still get the same error.