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Pull in r227062 from upstream clang trunk (by Renato Golin):

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Allows Clang to use LLVM's fixes-x18 option

  This patch allows clang to have llvm reserve the x18
  platform register on AArch64. FreeBSD will use this in the kernel for
  per-cpu data but has no need to reserve this register in userland so
  will need this flag to reserve it.

  This uses llvm r226664 to allow this register to be reserved.

  Patch by Andrew Turner.

Requested by:	andrew
This commit is contained in:
Dimitry Andric 2015-01-26 21:19:24 +00:00
parent 5ada58c747
commit fce16cf29f
2 changed files with 8 additions and 0 deletions
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3
contrib/llvm/tools/clang/include/clang/Driver/Options.td
View File

@ -1141,6 +1141,9 @@ def mno_long_calls : Flag<["-"], "mno-long-calls">, Group<m_arm_Features_Group>,
def mgeneral_regs_only : Flag<["-"], "mgeneral-regs-only">, Group<m_aarch64_Features_Group>,
HelpText<"Generate code which only uses the general purpose registers (AArch64 only)">;
def ffixed_x18 : Flag<["-"], "ffixed-x18">, Group<m_aarch64_Features_Group>,
HelpText<"Reserve the x18 register (AArch64 only)">;
def mvsx : Flag<["-"], "mvsx">, Group<m_ppc_Features_Group>;
def mno_vsx : Flag<["-"], "mno-vsx">, Group<m_ppc_Features_Group>;
def mfprnd : Flag<["-"], "mfprnd">, Group<m_ppc_Features_Group>;

5
contrib/llvm/tools/clang/lib/Driver/Tools.cpp
View File

@ -887,6 +887,11 @@ void Clang::AddAArch64TargetArgs(const ArgList &Args,
if (A->getOption().matches(options::OPT_mno_global_merge))
CmdArgs.push_back("-mno-global-merge");
}
if (Args.hasArg(options::OPT_ffixed_x18)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-aarch64-reserve-x18");
}
}
// Get CPU and ABI names. They are not independent