[AArch64] Add some CPU targets for "generic", A-53 and A-57.

Enables the clang driver to begin targeting specific CPUs. Introduced a
"generic" CPU which will ensure that the optional FP feature is enabled
by default when it gets to LLVM, without needing any extra arguments.
Cortex-A53 and A-57 are also introduced with tests, although backend
handling of them does not yet exist.

llvm-svn: 193740

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index a7e99647154..29efa2c74ea 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -3472,6 +3472,13 @@ public:
     return Feature == "aarch64" || (Feature == "neon" && FPU == NeonMode);
   }
 
+  virtual bool setCPU(const std::string &Name) {
+    return llvm::StringSwitch<bool>(Name)
+             .Case("generic", true)
+             .Cases("cortex-a53", "cortex-a57", true)
+             .Default(false);
+  }
+
   virtual bool handleTargetFeatures(std::vector<std::string> &Features,
                                     DiagnosticsEngine &Diags) {
     FPU = FPUMode;