[all-commits] [llvm/llvm-project] c38efb: [clang] Implement -falign-loops=N (N is a power of...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c38efb4899eac7b82daaf1320ad79f6271f9648a
      https://github.com/llvm/llvm-project/commit/c38efb4899eac7b82daaf1320ad79f6271f9648a
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-08-05 (Thu, 05 Aug 2021)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.def
    M clang/include/clang/Basic/DiagnosticDriverKinds.td
    M clang/include/clang/Basic/LangOptions.def
    M clang/include/clang/Driver/Options.td
    M clang/lib/CodeGen/BackendUtil.cpp
    M clang/lib/Driver/ToolChains/Clang.cpp
    A clang/test/CodeGen/align-loops.c
    M clang/test/Driver/clang_f_opts.c
    A clang/test/Driver/falign-loops.c

  Log Message:
  -----------
  [clang] Implement -falign-loops=N (N is a power of 2) for non-LTO

GCC supports multiple forms of -falign-loops=.
-falign-loops= is currently ignored in Clang.

This patch implements the simplest but the most useful form where N is a
power of 2.

The underlying implementation uses a `llvm::TargetOptions` option for now.
Bitcode generation ignores this option.

Differential Revision: https://reviews.llvm.org/D106701