[LLVMdev] constraining two virtual registers to be the same physical register

[Pete Cooper]

Hi Reed

You can do this on the instruction itself by telling it 2 operands must be the same register.  For example, from X86:

let Constraints = "$src1 = $dst" in
    defm INSERTPS : SS41I_insertf32<0x21, "insertps">;

Thanks,
Pete
> On Jun 10, 2014, at 5:38 PM, reed kotler <rkotler at mips.com> wrote:
> 
> Does anyone know if there is a way to constrain two virtual registers to be allocated
> to the same physical register?
> 
> Tia.
> 
> Reed
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