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| author | Renato Golin <renato.golin@linaro.org> | 2013-08-24 14:44:35 +0000 |
|---|---|---|
| committer | Renato Golin <renato.golin@linaro.org> | 2013-08-24 14:44:35 +0000 |
| commit | dbb77e60dc8b6dedd98804cd1667d2d295e306b6 (patch) | |
| tree | d12d135f11a64baa0ca6a27fe6e61b65a4936ec6 | |
| parent | 07f383f87aa756fb45c686af4ec1813abedb3c61 (diff) | |
| download | bcm5719-llvm-dbb77e60dc8b6dedd98804cd1667d2d295e306b6.tar.gz bcm5719-llvm-dbb77e60dc8b6dedd98804cd1667d2d295e306b6.zip | |
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
| -rw-r--r-- | clang/include/clang/Driver/Options.td | 5 | ||||
| -rw-r--r-- | clang/lib/Driver/Tools.cpp | 8 |
2 files changed, 12 insertions, 1 deletions
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td index 33a14a4b1bf..24759ceffed 100644 --- a/clang/include/clang/Driver/Options.td +++ b/clang/include/clang/Driver/Options.td @@ -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>; diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index 25be6b48b66..71cbcb292f7 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -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. |
