[AArch64] Add command-line options for ARMv8.2-A

This adds new values for the -march option (armv8.2a and armv8.2-a,
which are aliases of each other), and new suffixes for the -march and
-mcpu options (+fp16 and +nofp16), to allow targeting the ARMv8.2-A
architecture and it's optional half-precision floating-point extension.

Differential Revision: http://reviews.llvm.org/D15022

llvm-svn: 254160

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 3bd2ffb..9ae9348 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -2031,10 +2031,12 @@ static bool DecodeAArch64Features(const Driver &D, StringRef text,
                              .Case("simd", "+neon")
                              .Case("crc", "+crc")
                              .Case("crypto", "+crypto")
+                             .Case("fp16", "+fullfp16")
                              .Case("nofp", "-fp-armv8")
                              .Case("nosimd", "-neon")
                              .Case("nocrc", "-crc")
                              .Case("nocrypto", "-crypto")
+                             .Case("nofp16", "-fullfp16")
                              .Default(nullptr);
     if (result)
       Features.push_back(result);
@@ -2080,6 +2082,8 @@ getAArch64ArchFeaturesFromMarch(const Driver &D, StringRef March,
     // ok, no additional features.
   } else if (Split.first == "armv8.1-a" || Split.first == "armv8.1a") {
     Features.push_back("+v8.1a");
+  } else if (Split.first == "armv8.2-a" || Split.first == "armv8.2a" ) {
+    Features.push_back("+v8.2a");
   } else {
     return false;
   }