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Add the -ffixed-r9 flag for ARM. 

This patch adds the -ffixed-r9 flag to clang to instruct llvm to
globally preserve the contents of r9. The flag is added to the newly
created ARM specific group.

While at it, also place marm / mno-thumb in that group.

Patch by Jeroen Hofstee.

llvm-svn: 189174
This commit is contained in:
Renato Golin 2013-08-24 14:44:35 +00:00
parent 07f383f87a
commit dbb77e60dc
2 changed files with 12 additions and 1 deletions
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5
clang/include/clang/Driver/Options.td
View File

@ -72,6 +72,7 @@ def clang_i_Group : OptionGroup<"<clang i group>">, Group<i_Group>;
def m_Group : OptionGroup<"<m group>">, Group<CompileOnly_Group>;
def m_x86_Features_Group : OptionGroup<"<m x86 features group>">, Group<m_Group>;
def m_hexagon_Features_Group : OptionGroup<"<m hexagon features group>">, Group<m_Group>;
def m_arm_Features_Group : OptionGroup<"<m arm features group>">, Group<m_Group>;
def opencl_Group : OptionGroup<"<opencl group>">;
def u_Group : OptionGroup<"<u group>">;
def mips_CPUs_Group : OptionGroup<"<MIPS CPU aliases group>">,
@ -986,8 +987,10 @@ def mno_rtm : Flag<["-"], "mno-rtm">, Group<m_x86_Features_Group>;
def mno_prfchw : Flag<["-"], "mno-prfchw">, Group<m_x86_Features_Group>;
def mno_rdseed : Flag<["-"], "mno-rdseed">, Group<m_x86_Features_Group>;
def mno_thumb : Flag<["-"], "mno-thumb">, Group<m_Group>;
def mno_thumb : Flag<["-"], "mno-thumb">, Group<m_arm_Features_Group>;
def marm : Flag<["-"], "marm">, Alias<mno_thumb>;
def ffixed_r9 : Flag<["-"], "ffixed-r9">, Group<m_arm_Features_Group>,
HelpText<"Reserve the r9 register (ARM only)">;
def mno_warn_nonportable_cfstrings : Flag<["-"], "mno-warn-nonportable-cfstrings">, Group<m_Group>;
def mno_omit_leaf_frame_pointer : Flag<["-"], "mno-omit-leaf-frame-pointer">, Group<m_Group>;

8
clang/lib/Driver/Tools.cpp
View File

@ -795,6 +795,14 @@ void Clang::AddARMTargetArgs(const ArgList &Args,
options::OPT_mno_implicit_float,
true))
CmdArgs.push_back("-no-implicit-float");
// llvm does not support reserving registers in general. There is support
// for reserving r9 on ARM though (defined as a platform-specific register
// in ARM EABI).
if (Args.hasArg(options::OPT_ffixed_r9)) {
CmdArgs.push_back("-backend-option");
CmdArgs.push_back("-arm-reserve-r9");
}
}
// Translate MIPS CPU name alias option to CPU name.