[LLVMdev] Instruction Constraints Question

[Krzysztof Parzyszek]

On 1/23/2013 3:33 PM, Anton Korobeynikov wrote:
>> It doesn't look like TableGen supports Constraints beyond EARLY_CLOBBER
>> and TIED_TO.  We would need to add a constraint such as "$dst != $src1,
>> $dst != $mask, $src1 != $mask" to the current patterns to enforce the
>> rules.
> You can emulate such constraints via early clobbing. Just mark dst as
> early clobbing.

How would you emulate src1 != mask via early clobbing?

-Krzysztof

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