[Hexagon] Emit a warning when -fvectorize is given without -mhvx

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330150 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 15 insertions, 7 deletions

diff --git a/lib/Driver/ToolChains/Hexagon.cpp b/lib/Driver/ToolChains/Hexagon.cpp
index 6402a8288b..04b09d9483 100644
--- a/lib/Driver/ToolChains/Hexagon.cpp
+++ b/lib/Driver/ToolChains/Hexagon.cpp
@@ -108,8 +108,11 @@ void hexagon::getHexagonTargetFeatures(const Driver &D, const ArgList &Args,
 
   Features.push_back(UseLongCalls ? "+long-calls" : "-long-calls");
 
-  bool HasHVX(false);
+  bool HasHVX = false;
   handleHVXTargetFeatures(D, Args, Features, HasHVX);
+
+  if (HexagonToolChain::isAutoHVXEnabled(Args) && !HasHVX)
+    D.Diag(diag::warn_drv_vectorize_needs_hvx);
 }
 
 // Hexagon tools start.
@@ -520,12 +523,9 @@ void HexagonToolChain::addClangTargetOptions(const ArgList &DriverArgs,
     CC1Args.push_back("-target-feature");
     CC1Args.push_back("+reserved-r19");
   }
-  if (Arg *A = DriverArgs.getLastArg(options::OPT_fvectorize,
-                                     options::OPT_fno_vectorize)) {
-    if (A->getOption().matches(options::OPT_fvectorize)) {
-      CC1Args.push_back("-mllvm");
-      CC1Args.push_back("-hexagon-autohvx");
-    }
+  if (isAutoHVXEnabled(DriverArgs)) {
+    CC1Args.push_back("-mllvm");
+    CC1Args.push_back("-hexagon-autohvx");
   }
 }
 
@@ -564,6 +564,13 @@ HexagonToolChain::GetCXXStdlibType(const ArgList &Args) const {
   return ToolChain::CST_Libstdcxx;
 }
 
+bool HexagonToolChain::isAutoHVXEnabled(const llvm::opt::ArgList &Args) {
+  if (Arg *A = Args.getLastArg(options::OPT_fvectorize,
+                               options::OPT_fno_vectorize))
+    return A->getOption().matches(options::OPT_fvectorize);
+  return false;
+}
+
 //
 // Returns the default CPU for Hexagon. This is the default compilation target
 // if no Hexagon processor is selected at the command-line.
diff --git a/lib/Driver/ToolChains/Hexagon.h b/lib/Driver/ToolChains/Hexagon.h
index 229a08c76d..e43b8a5b88 100644
--- a/lib/Driver/ToolChains/Hexagon.h
+++ b/lib/Driver/ToolChains/Hexagon.h
@@ -94,6 +94,7 @@ public:
   void getHexagonLibraryPaths(const llvm::opt::ArgList &Args,
       ToolChain::path_list &LibPaths) const;
 
+  static bool isAutoHVXEnabled(const llvm::opt::ArgList &Args);
   static const StringRef GetDefaultCPU();
   static const StringRef GetTargetCPUVersion(const llvm::opt::ArgList &Args);