IDA IDC-script: cannot shift right properly

I have a little problem with idc-script
Here's an example:

Message("\n%X",0xC0665A84>>31);
Message("\n%X",0xC0665A84/0x80000000);

First resuls 0xFFFFFFFF, and second - 0;

What's a damn? The result must be 1 in both cases.

I have to implement ROR and ROL instructions in my IDC-script, but I can't 'cause the reason above.

Could someone tell me another way?

Thank you.

[nino]

IDC uses signed arithmetic. Shift Right corresponds to SAR. Nevertheless you can still implement ROL and ROR keeping this in mind.

2 ninio:
Thanks a lot.

If someone need:
#define ROL(x,n) x<<n|(~(0xFFFFFFFF<<n)&x>>32-n)
#define ROR(x,n) x<<32-n|(~(0x80000000>>n-1)&x>>n)