Hi:
>> 1) does your machine use cc0?
No. In my RISC chip, there is a status register existed, like ARM. But I now
I didn't write any code to support it, as well as absent cc0 register.
>> 2) what pass is producing those subregs?
This is really puzzled me. I just wrote the PROMOTE_MODE like MIPS.
>> 3) what is your definition of GO_IF_LEGITIMATE_ADDRESS?
Here is my definition of GO_IF_LEGITIMATE_ADDRESS:
#ifndef REG_OK_STRICT
#define RICE_REG_STRICT_P 0
#else /* REG_OK_STRICT */
#define RICE_REG_STRICT_P 1
#endif /* REG_OK_STRICT */
#define GO_IF_LEGITIMATE_ADDRESS(mode,x,label) \
{\
if (rice_go_if_legitimate_address(mode, x, RICE_REG_STRICT_P))\
goto label;\
}
int rice_go_if_legitimate_address(enum machine_mode mode,rtx X, int
bIsStrict)
{
rtx op1,op2;
enum rtx_code code = GET_CODE (X);
//(Rmem) #4/2/1 -PRI/PRD/POI/POD
if ((code == PRE_INC || code == PRE_DEC)
&& (GET_MODE_SIZE (mode) <= 4))
{
rtx op1;
op1=XEXP(X, 0);
if(GET_CODE(op1) == REG)
return is_base_reg_strict(REGNO(op1));
else
return RICE_NO;
}
//(Rmem) {Rx, #UImm8} -PRI/PRD/POI/POD -W
if ((code == POST_MODIFY || code == PRE_MODIFY)
&& rice_reg_ok_for_base (XEXP (X, 0), bIsStrict)
&& GET_CODE (XEXP (X, 1)) == PLUS
&& rtx_equal_p (XEXP (XEXP (X, 1), 0), XEXP (X, 0)))
{
rtx addend = XEXP (XEXP (X, 1), 1);
return (rice_if_legitimate_index (mode, addend, bIsStrict));
}
if(GET_CODE(X) == PLUS)
{
//check where the form is like (Rmem) {Rx, #UImm8}
return rice_base_index_address(X, bIsStrict);
}
return RICE_NO;
}
BTY: the address mode in my RISC chip is like the following:
LOADW Rd (Rs) Rx/offset(8bits unsigned immediate)
Which means Rd = (Rs + Rx) 0r Rd = (Rs + imm_8bits). So if the immediate
offset is larger than 255, it should be move into register first.
I think this definition in my port is appropriate.
Any advice?
>> [I trimmed a bit the list of recipients, sending to the mailing list is
usually enough.]
Ok, I gotta it and will keep attention in future.
Thanks!
_______________________________________________
Best Regards
Daniel Tian
Mavrix Technology, Inc.
Address：200 Zhangheng Road, #3501, Building 3, Zhangjiang Hi-tech Park,
Shanghai, P.R.China (201204)
Tel:86(21)51095958 - 8125
Fax:86(21)50277658
email：daniel.t...@mavrixtech.com.cn
www.mavrixtech.com
