tree 0d5f54c162f641a98b2c3defe81e3ff3e6741ecf
parent 1d2a7658ed92841f42f9b94cf59cd4c3f735585e
author Nicolas Vasilache <ntv@google.com> 1569603338 -0700
committer TensorFlower Gardener <gardener@tensorflow.org> 1569619153 -0700

Promote MemRefDescriptor to a pointer to struct when passing function boundaries in LLVMLowering.

The strided MemRef RFC discusses a normalized descriptor and interaction with library calls (https://groups.google.com/a/tensorflow.org/forum/#!topic/mlir/MaL8m2nXuio).
Lowering of nested LLVM structs as value types does not play nicely with externally compiled C/C++ functions due to ABI issues.
Solving the ABI problem generally is a very complex problem and most likely involves taking
a dependence on clang that we do not want atm.

A simple workaround is to pass pointers to memref descriptors at function boundaries, which this CL implement.

PiperOrigin-RevId: 271591708