[all-commits] [llvm/llvm-project] 7c0acc: Lower Fortran intrinsic to a runtime call/llvm int...

[kiranchandramohan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7c0acc1a989ae2765e0b7e20d6bc005280351956
      https://github.com/llvm/llvm-project/commit/7c0acc1a989ae2765e0b7e20d6bc005280351956
  Author: Kiran Chandramohan <kiran.chandramohan at arm.com>
  Date:   2022-02-25 (Fri, 25 Feb 2022)

  Changed paths:
    M flang/lib/Lower/IntrinsicCall.cpp
    A flang/test/Lower/Intrinsics/abs.f90
    A flang/test/Lower/Intrinsics/missing-math-runtime.f90

  Log Message:
  -----------
  Lower Fortran intrinsic to a runtime call/llvm intrinsic

This patch brings in code which can lower a Fortran intrinsic to
a runtime call or an llvm intrinsic. For math intrinsics the
runtime call is to the `math` or `pgmath` library. Non-math
intrinsics are covered by the Flang runtime. A distance computation
mechanism is introduced to find the runtime function that closely
matches the types of the intrinsic call.

In this patch, the `abs` intrinsic is lowered in the following way,
-> Integer version is lowered as a group of MLIR/FIR operations
-> Real version is lowered to llvm intrinsics
-> Complex version is lowered to the `math_hypot` runtime function

This patch is part of upstreaming from the fir-dev branch of https://github.com/flang-compiler/f18-llvm-project

Reviewed By: clementval

Differential Revision: https://reviews.llvm.org/D120403

Co-authored-by: Jean Perier <jperier at nvidia.com>
Co-authored-by: Eric Schweitz <eschweitz at nvidia.com>
Co-authored-by: zacharyselk <zrselk at gmail.com>
Co-authored-by: V Donaldson <vdonaldson at nvidia.com>
Co-authored-by: Valentin Clement <clementval at gmail.com>