tree 7b6923f3e7e62e45dccc1c8de729afaa93d64312
parent 275ee5d2514bd14a7b4721b3cb0ac251a1822cb4
author Nicolas Vasilache <ntv@google.com> 1585886902 -0400
committer Nicolas Vasilache <ntv@google.com> 1585944893 -0400

[mlir][Linalg] Employ finer-grained control of C interface emission

Summary:
Linalg makes it possible to interface codegen with externally precompiled HPC libraries. The mechanism to allow such interop uses a normalized ABI and the emission of C interface wrappers.

The mechanism controlling these C interface emission is too aggressive and makes it very easy to obtained undefined symbols for external function (e.g. the ones coming from libm).

This revision uses the newly introduced llvm.emit_c_interface function attribute which allows controlling this behavior at a function granularity. As a consequence LinalgToLLVM does not need to activate the C wrapper emission when adding the StdToLLVM patterns.

Differential Revision: https://reviews.llvm.org/D77364