[llvm-commits] LoadSDNode invariance

[Peter Cooper]

Hi

I've added new metadata to load IR instructions to say if they are invariant, i.e., don't change at runtime.

The IR change was simple but i'm not sure about the MachineInstr/DAG level.  I've attached the change which encodes the invariant flag in the MemSDNodeFlags next to the volatile flag.

Please have a look and tell me if this is ideal?  The main thing i wasn't happy doing was adding another DAG.getLoad method with the invariant flag, but the alternative was changing the existing method which would lead to changing dozens of calls.

Thanks,
Pete

-------------- next part --------------
A non-text attachment was scrubbed...
Name: p.patch
Type: application/octet-stream
Size: 15617 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20111104/e81ae7df/attachment.obj>