aboutsummaryrefslogtreecommitdiff
path: root/clang/lib/Driver/Tools.cpp
diff options
context:
space:
mode:
authorDavid Majnemer <david.majnemer@gmail.com>2015-02-13 07:55:47 +0000
committerDavid Majnemer <david.majnemer@gmail.com>2015-02-13 07:55:47 +0000
commitabc482effcabd373f5c96fb8f9dd493968a112dd (patch)
tree2b1eb59e9ebf337925c18d2ad7537c0d60995c27 /clang/lib/Driver/Tools.cpp
parent2a903b900d212dfaf5482408042a6f7b9e87c9a6 (diff)
downloadllvm-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.cpp13
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)