[PATCH] D106701: [clang] Add -falign-loops=N where N is a power of 2

[Fangrui Song via Phabricator via llvm-commits]

MaskRay created this revision.
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GCC supports multiple forms of -falign-loops=. This patch implements the
simplest but the most useful form where N is a power of 2.

A lib/CodeGen/CommandFlags.cpp option "-align-loops=" is added.
It can replace -x86-experimental-pref-loop-alignment=.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D106701

Files:
  clang/include/clang/Basic/CodeGenOptions.def
  clang/include/clang/Basic/DiagnosticDriverKinds.td
  clang/include/clang/Basic/LangOptions.def
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/test/Driver/falign-loops.c
  llvm/include/llvm/CodeGen/CommandFlags.h
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/Target/TargetOptions.h
  llvm/lib/CodeGen/CommandFlags.cpp
  llvm/lib/CodeGen/TargetLoweringBase.cpp
  llvm/test/CodeGen/RISCV/loop-alignment.ll
  llvm/test/CodeGen/X86/innermost-loop-alignment.ll

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