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author | David Majnemer <david.majnemer@gmail.com> | 2015-02-13 07:55:47 +0000 |
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committer | David Majnemer <david.majnemer@gmail.com> | 2015-02-13 07:55:47 +0000 |
commit | abc482effcabd373f5c96fb8f9dd493968a112dd (patch) | |
tree | 2b1eb59e9ebf337925c18d2ad7537c0d60995c27 /clang/lib/Driver/Tools.cpp | |
parent | 2a903b900d212dfaf5482408042a6f7b9e87c9a6 (diff) | |
download | llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.zip llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.tar.gz llvm-abc482effcabd373f5c96fb8f9dd493968a112dd.tar.bz2 |
MS ABI: Implement /volatile:ms
The /volatile:ms semantics turn volatile loads and stores into atomic
acquire and release operations. This distinction is important because
volatile memory operations do not form a happens-before relationship
with non-atomic memory. This means that a volatile store is not
sufficient for implementing a mutex unlock routine.
Differential Revision: http://reviews.llvm.org/D7580
llvm-svn: 229082
Diffstat (limited to 'clang/lib/Driver/Tools.cpp')
-rw-r--r-- | clang/lib/Driver/Tools.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp index d22bebe..0f74ea1 100644 --- a/clang/lib/Driver/Tools.cpp +++ b/clang/lib/Driver/Tools.cpp @@ -4888,6 +4888,19 @@ void Clang::AddClangCLArgs(const ArgList &Args, ArgStringList &CmdArgs) const { CmdArgs.push_back("-P"); } + unsigned VolatileOptionID; + if (getToolChain().getTriple().getArch() == llvm::Triple::x86_64 || + getToolChain().getTriple().getArch() == llvm::Triple::x86) + VolatileOptionID = options::OPT__SLASH_volatile_ms; + else + VolatileOptionID = options::OPT__SLASH_volatile_iso; + + if (Arg *A = Args.getLastArg(options::OPT__SLASH_volatile_Group)) + VolatileOptionID = A->getOption().getID(); + + if (VolatileOptionID == options::OPT__SLASH_volatile_ms) + CmdArgs.push_back("-fms-volatile"); + Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg); Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb); if (MostGeneralArg && BestCaseArg) |