[all-commits] [llvm/llvm-project] ca41e0: [Flang][Lower] Attach target_cpu and target_featur...

[Sergio Afonso via All-commits]

  Branch: refs/heads/users/skatrak/spr/target-attrs-flang
  Home:   https://github.com/llvm/llvm-project
  Commit: ca41e03ee3bf1c5e465edf53a337cbc7498658da
      https://github.com/llvm/llvm-project/commit/ca41e03ee3bf1c5e465edf53a337cbc7498658da
  Author: Sergio Afonso <safonsof at amd.com>
  Date:   2024-01-19 (Fri, 19 Jan 2024)

  Changed paths:
    M flang/include/flang/Lower/Bridge.h
    M flang/include/flang/Optimizer/CodeGen/CGPasses.td
    M flang/include/flang/Optimizer/CodeGen/Target.h
    M flang/include/flang/Optimizer/Dialect/Support/FIRContext.h
    M flang/lib/Frontend/FrontendActions.cpp
    M flang/lib/Lower/Bridge.cpp
    M flang/lib/Optimizer/CodeGen/CodeGen.cpp
    M flang/lib/Optimizer/CodeGen/Target.cpp
    M flang/lib/Optimizer/CodeGen/TargetRewrite.cpp
    M flang/lib/Optimizer/CodeGen/TypeConverter.cpp
    M flang/lib/Optimizer/Dialect/Support/FIRContext.cpp
    M flang/test/Driver/save-mlir-temps.f90
    A flang/test/Fir/target-rewrite-target-cpu.fir
    A flang/test/Fir/target-rewrite-target-features.fir
    A flang/test/Lower/target-features-amdgcn.f90
    A flang/test/Lower/target-features-x86_64.f90
    M flang/tools/bbc/bbc.cpp
    M flang/tools/tco/tco.cpp
    M flang/unittests/Optimizer/FIRContextTest.cpp

  Log Message:
  -----------
  [Flang][Lower] Attach target_cpu and target_features attributes to MLIR functions

This patch forwards the target CPU and features information from the Flang
frontend to MLIR func.func operation attributes, which are later used to
populate the target_cpu and target_features llvm.func attributes.

This is achieved in two stages:
    1. Introduce the `fir.target_cpu` and `fir.target_features` module
    attributes with information from the target machine immediately after the
    initial creation of the MLIR module in the lowering bridge.
    2. Update the target rewrite flang pass to get this information from the
    module and pass it along to all func.func MLIR operations, respectively as
    attributes named `target_cpu` and `target_features`. These attributes will
    be automatically picked up during Func to LLVM dialect lowering and used to
    initialize the corresponding llvm.func named attributes.

The target rewrite and FIR to LLVM lowering passes are updated with the ability
to override these module attributes, and the `CodeGenSpecifics` optimizer class
is augmented to make this information available to target-specific MLIR
transformations.

This completes a full flow by which target CPU and features make it all the way
from compiler options to LLVM IR function attributes.