[PATCH] R600: Handle -mcpu option

[Tom Stellard]

From: Tom Stellard <thomas.stellard at amd.com>

---
 lib/Driver/Tools.cpp |   19 +++++++++++++++++++
 lib/Driver/Tools.h   |    1 +
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 62b1feb..b0de2a8 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -1108,6 +1108,21 @@ void Clang::AddPPCTargetArgs(const ArgList &Args,
   }
 }
 
+/// Get the (LLVM) name of the R600 gpu we are targeting.
+static std::string getR600TargetGPU(const ArgList &Args) {
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    return A->getValue();
+  }
+  return "";
+}
+
+void Clang::AddR600TargetArgs(const ArgList &Args,
+                              ArgStringList &CmdArgs) const {
+  std::string TargetGPUName = getR600TargetGPU(Args);
+  CmdArgs.push_back("-target-cpu");
+  CmdArgs.push_back(Args.MakeArgString(TargetGPUName.c_str()));
+}
+
 void Clang::AddSparcTargetArgs(const ArgList &Args,
                              ArgStringList &CmdArgs) const {
   const Driver &D = getToolChain().getDriver();
@@ -2230,6 +2245,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     AddPPCTargetArgs(Args, CmdArgs);
     break;
 
+  case llvm::Triple::r600:
+    AddR600TargetArgs(Args, CmdArgs);
+    break;
+
   case llvm::Triple::sparc:
     AddSparcTargetArgs(Args, CmdArgs);
     break;
diff --git a/lib/Driver/Tools.h b/lib/Driver/Tools.h
index 846c834..f002e30 100644
--- a/lib/Driver/Tools.h
+++ b/lib/Driver/Tools.h
@@ -51,6 +51,7 @@ namespace tools {
                           bool KernelOrKext) const;
     void AddMIPSTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddPPCTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
+    void AddR600TargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddSparcTargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddX86TargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const;
     void AddHexagonTargetArgs (const ArgList &Args, ArgStringList &CmdArgs) const;
-- 
1.7.3.4