Change calling convention of ATenDispatch from getOp to callUnboxed. (#26857)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26857
Previously, ATenDispatch took TensorTypeId and returned a function pointer, to
avoid requiring a direct dependence on Tensor (which would have caused a header
cycle). Thanks to the work of Sebastian, it is now possible to include
TensorBody.h without inducing a cycle; so we can now replace this indirect
implementation with a more direct implementation of unboxedCall and move most of
the implementation details into ATenDispatch (simplifying generated code). This
is a necessary prerequisite for boxed fallback work I want to do, as I want to
handle generation of boxing from inside ATenDispatch, not generated code.
Unfortunately, we still need to generate the multidispatch list in
function_wrapper.py to accommodate c10 dispatcher.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D17602540
Pulled By: ezyang
fbshipit-source-id: 6927e66924405f5bf5cb67f1b57e49bc9a0f58ec
