[LLVMdev] Passing return values on the stack & storing arbitrary sized integers

[Fabian Scheler]

2012/8/21 Anton Korobeynikov <anton at korobeynikov.info>:
>> This isn't really my area of expertise, but I think you're messing up
>> your RegisterClass definition.  Look at how ARM defines DTriple.
> DTriple is untyped :) , because we do not have any valut type which
> defines 3xi64.
> However, the paired register needs to have type.
>
> Fabian, what are the definitions of ER and DR register classes?

Hi Anton,

here are the definitions of these register classes:

// Data register class
def DR : RegisterClass<"TriCore", [i32], 32,
                       (add D0, D1, D2,  D3,  D4,  D5,  D6,  D7,
                            D8, D9, D10, D11, D12, D13, D14, D15)>;

// Extended-size data register class
def ER : RegisterClass<"TriCore", [i64], 32,
                       (add E0, E2, E4, E6, E8, E10, E12, E14)> {
  let SubRegClasses = [(DR sub_even, sub_odd)];
}

And the DX and EX registers are defined this way:

def D0  : TriCoreReg<0,  "d0">,  DwarfRegNum<[0]>;
...
def D15 : TriCoreReg<15, "d15">, DwarfRegNum<[15]>;

def E0  : TriCoreRegWithSubregs<0,  "e0",  [D0,  D1]>,  DwarfRegNum<[32]>;
def E2  : TriCoreRegWithSubregs<2,  "e2",  [D2,  D3]>,  DwarfRegNum<[33]>;
...
def E14 : TriCoreRegWithSubregs<14, "e14", [D14, D15]>, DwarfRegNum<[39]>;

Ciao, Fabian