[all-commits] [llvm/llvm-project] 433c8d: [IR] make -stack-alignment= into a module attr

[Nick Desaulniers via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 433c8d950cb3a1fa0977355ce0367e8c763a3f13
      https://github.com/llvm/llvm-project/commit/433c8d950cb3a1fa0977355ce0367e8c763a3f13
  Author: Nick Desaulniers <ndesaulniers at google.com>
  Date:   2021-06-08 (Tue, 08 Jun 2021)

  Changed paths:
    M clang/lib/CodeGen/BackendUtil.cpp
    M clang/lib/CodeGen/CodeGenModule.cpp
    M clang/test/CodeGen/stackrealign-main.c
    M llvm/include/llvm/IR/Module.h
    M llvm/include/llvm/Target/TargetOptions.h
    M llvm/lib/CodeGen/CommandFlags.cpp
    M llvm/lib/IR/Module.cpp
    M llvm/lib/Target/X86/X86TargetMachine.cpp
    M llvm/test/CodeGen/Generic/ForceStackAlign.ll
    M llvm/test/CodeGen/X86/base-pointer-and-cmpxchg.ll
    M llvm/test/CodeGen/X86/base-pointer-and-mwaitx.ll
    A llvm/test/CodeGen/X86/dynamic-allocas-VLAs-stack-align.ll
    M llvm/test/CodeGen/X86/dynamic-allocas-VLAs.ll
    M llvm/test/CodeGen/X86/force-align-stack-alloca.ll
    M llvm/test/CodeGen/X86/hipe-cc.ll
    M llvm/test/CodeGen/X86/hipe-cc64.ll
    A llvm/test/CodeGen/X86/movtopush-stack-align.ll
    M llvm/test/CodeGen/X86/movtopush.ll
    M llvm/test/CodeGen/X86/pr11468.ll
    M llvm/test/CodeGen/X86/unaligned-spill-folding.ll
    M llvm/test/CodeGen/X86/x86-64-baseptr.ll
    M llvm/test/CodeGen/X86/x86-64-xmm-spill-unaligned.ll
    A llvm/test/Linker/stack-alignment.ll

  Log Message:
  -----------
  [IR] make -stack-alignment= into a module attr

Similar to D102742, specifying the stack alignment via CodegenOpts means
that this flag gets dropped during LTO, unless the command line is
re-specified as a plugin opt. Instead, encode this information as a
module level attribute so that we don't have to expose this llvm
internal flag when linking the Linux kernel with LTO.

Looks like external dependencies might need a fix:
* https://github.com/llvm-hs/llvm-hs/issues/345
* https://github.com/halide/Halide/issues/6079

Link: https://github.com/ClangBuiltLinux/linux/issues/1377

Reviewed By: tejohnson

Differential Revision: https://reviews.llvm.org/D103048