[LLVMdev] Determining the register type of a MachineOperand

[Mon Ping Wang]

To my knowledge, I don't think there is an easy way to get the MVT  
information from a MachineOperand.   Why do you need it for?  In my  
mind, the MachineInstr and its associated operands represent a  
physical machine instruction and I typically want to think of those as  
machine opcodes and machine register files.  I am typically interested  
in the mapping of MVTs to register classes when I'm generating machine  
instructions.  Note that a register class may map to multiple MVTs  
depending on your description.

-- Mon Ping

On Sep 24, 2008, at 12:15 PM, Villmow, Micah wrote:

> This only has the register class information, not the register type  
> information.
>
> My register class has multiple register types and I need to know how  
> to differentiate which register type of my register class of the  
> current register.
> The information in the MVT data type is what I need, i.e. the  
> position in the GPRVT array of each register.
>
> Something equivalent to MVT getValueType() but for registers.
>
> Thanks,
>
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev- 
> bounces at cs.uiuc.edu] On Behalf Of Evan Cheng
> Sent: Wednesday, September 24, 2008 10:22 AM
> To: LLVM Developers Mailing List
> Subject: Re: [LLVMdev] Determining the register type of a  
> MachineOperand
>
> You can get to the MachineInstr from a MachineOperand. Then get to  
> its TargetInstrDesc and TargetOperandInfo which has register class  
> information.
>
> Evan
>
> On Sep 23, 2008, at 12:44 PM, Villmow, Micah wrote:
>
>
> How do I determine what type of register(i.e. i32, f32, etc..) I am  
> accessing from a MachineOperand? I.e. how do I get to the MVT  
> struct, or equivalent information, from a MachineOperand object?
>
> Micah Villmow
> Systems Engineer
> Advanced Technology & Performance
> Advanced Micro Devices Inc.
> 4555 Great America Pkwy,
> Santa Clara, CA. 95054
> P: 408-572-6219
> F: 408-572-6596
>
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