llvm dev - Apr 2012 - [LLVMdev] [PATCH][RFC] Allow target-specific morphing of intrinsics during SelectionDAG building

All,

The attached patch adds an extra hook to TargetLowering that allows a target to
change the Intrinsic ID and Values associated with an intrinsic call during
SelectionDAG construction.  The existing getTgtMemIntrinsic hook allows a target
to change the Intrinsic ID but not the associated Values.  Further, we wish to
use this hook for more than just memory-touching intrinsics.

We would like to get the community's feedback on this so as to make sure
this patch is as universally applicable as possible.  While not currently used
in the open-source tree, this patch lays some groundwork for submission of the
NVIDIA NVPTX back-end into the open-source tree.


Thanks,

Justin Holewinski


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