[Qemu-devel] TCGv_i64 type?

[Qemu-devel] TCGv_i64 type?

[Jun Koi]

Hi,

I found that in tcg/tcg.h, we have following definitions:

typedef int TCGv_i32;
typedef int TCGv_i64;


Is that correct? Why do we have the same definition for 64bit and 32
bit types? Doesnt TCGv_i64 suppose to be 64 bit?

Thanks,
Jun

Re: [Qemu-devel] TCGv_i64 type?

[Richard Henderson]

On 12/13/2009 06:00 PM, Jun Koi wrote:
> I found that in tcg/tcg.h, we have following definitions:
>
> typedef int TCGv_i32;
> typedef int TCGv_i64;
>
> Is that correct? Why do we have the same definition for 64bit and 32
> bit types? Doesnt TCGv_i64 suppose to be 64 bit?

Look higher up in the DEBUG_TCGV section and you'll find

typedef struct
{
     int i32;
} TCGv_i32;

typedef struct
{
     int i64;
} TCGv_i64;

which are separate types for type checking purposes.

Both are "int" because at the TCG level these are register numbers. 
They are separate types because they indicate 32-bit or 64-bit 
quantities in the compiled code.


r~