[all-commits] [llvm/llvm-project] 67ec87: llc: Change behavior of -mattr with existing attri...

[Matt Arsenault via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 67ec8744d7e72b50a5db5038c9643584ce57cb0c
      https://github.com/llvm/llvm-project/commit/67ec8744d7e72b50a5db5038c9643584ce57cb0c
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2020-01-15 (Wed, 15 Jan 2020)

  Changed paths:
    M llvm/include/llvm/CodeGen/CommandFlags.inc
    M llvm/test/CodeGen/WebAssembly/target-features.ll
    M llvm/test/Other/opt-override-mcpu-mattr.ll

  Log Message:
  -----------
  llc: Change behavior of -mattr with existing attribute

Append this to the existing target-features attribute on the function.

Some flags ignore existing attributes, and some overwrite them. Move
towards consistently respecting existing attributes if present. Since
target features act as a state machine on their own, append to the
function attribute. The backend default added feature list, function
attributes, and -mattr will all be appended together, and the later
features can individually toggle the earlier settings.