Is const_int zero extended or sign-extended?

[Bingfeng Mei]

Hello,
I am confused by one very basic concept :).  In the following rtx expression, 
if const_int is 32-bit and DImode is 64-bit, will the const_int sign-extended 
or zero-extended. In other word, is the content of reg:DI 95 
0xffffffffffffffff9 or 0xffffffff9 after this instruction? 

(set:DI (reg:DI 95)
        (const_int -7 [0xfffffff9]))

Thanks,
Bingfeng Mei