Bingfeng Mei wrote:
> 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
>
IIUC in the absence of any explicit extension operation, a const_int is
taken to be whatever size the object it is assigned to, with the value given
by the signed decimal interpretation. That RTL sets reg 95 to a DImode -7.
Is this part of a larger problem?
cheers,
DaveK
