Allow case-insensitive values for -mtune for AArch64 target in line with GCC.

GCC allows case-insensitive values for -mcpu, -march and -mtune options.
This patch implements the same behaviour for the -mtune option for the AArch64 target.

Differential Revision: http://reviews.llvm.org/D10563

llvm-svn: 242663

1 files changed, 5 insertions, 4 deletions

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index fd5c0be..bf85a0d 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -844,7 +844,7 @@ static std::string getAArch64TargetCPU(const ArgList &Args) {
   std::string CPU;
   // If we have -mtune or -mcpu, use that.
   if ((A = Args.getLastArg(options::OPT_mtune_EQ))) {
-    CPU = A->getValue();
+    CPU = StringRef(A->getValue()).lower();
   } else if ((A = Args.getLastArg(options::OPT_mcpu_EQ))) {
     StringRef Mcpu = A->getValue();
     CPU = Mcpu.split("+").first.lower();
@@ -1908,10 +1908,11 @@ static bool
 getAArch64MicroArchFeaturesFromMtune(const Driver &D, StringRef Mtune,
                                      const ArgList &Args,
                                      std::vector<const char *> &Features) {
+  std::string MtuneLowerCase = Mtune.lower();
   // Handle CPU name is 'native'.
-  if (Mtune == "native")
-    Mtune = llvm::sys::getHostCPUName();
-  if (Mtune == "cyclone") {
+  if (MtuneLowerCase == "native")
+    MtuneLowerCase = llvm::sys::getHostCPUName();
+  if (MtuneLowerCase == "cyclone") {
     Features.push_back("+zcm");
     Features.push_back("+zcz");
   }