[LLVMdev] Operand constrain specification

[Demikhovsky, Elena]

Thank you, it helps!

-           Elena

From: Jim Grosbach [mailto:grosbach at apple.com]
Sent: Tuesday, July 16, 2013 22:57
To: Hal Finkel; Demikhovsky, Elena
Cc: LLVMdev List
Subject: Re: [LLVMdev] Operand constrain specification


On Jul 16, 2013, at 9:32 AM, Hal Finkel <hfinkel at anl.gov<mailto:hfinkel at anl.gov>> wrote:


----- Original Message -----



Hi,

How can I specify in a .td file that source and destination should
not use the same register?

I think that you can use the EarlyClobber operand flag to achieve this (TableGen has an @earlyclobber constraint; there are some examples in the ARM backend).

Yes, that's exactly what that constraint is for.

-Jim



-Hal



Thanks.


   * Elena





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Argonne National Laboratory
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