From 054b52c366256e7cde9c937006df944372e09acc Mon Sep 17 00:00:00 2001
From: Viktor Kutuzov <vkutuzov@accesssoftek.com>
Date: Sat, 21 Nov 2009 00:00:02 +0000
Subject: [PATCH] Added two SubtargetFeatures::AddFeatures methods, which
 accept a comma-separated string or already parsed command line parameters as
 input, and some code re-factoring to use these new methods.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89516 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Target/SubtargetFeature.h |  7 +++++++
 lib/Target/SubtargetFeature.cpp        | 27 ++++++++++++++++++++++++++
 tools/lto/LTOCodeGenerator.cpp         | 13 ++++++++++---
 3 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/include/llvm/Target/SubtargetFeature.h b/include/llvm/Target/SubtargetFeature.h
index 38a3cc2fefa..fb5dba1f6db 100644
--- a/include/llvm/Target/SubtargetFeature.h
+++ b/include/llvm/Target/SubtargetFeature.h
@@ -22,6 +22,7 @@
 #include <vector>
 #include <cstring>
 #include "llvm/ADT/Triple.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/System/DataTypes.h"
 
 namespace llvm {
@@ -93,6 +94,12 @@ public:
   /// Adding Features.
   void AddFeature(const std::string &String, bool IsEnabled = true);
            
+  /// Add a set of features from the comma-separated string.
+  void AddFeatures(const std::string &String);
+
+  /// Add a set of features from the parsed command line parameters.
+  void AddFeatures(const cl::list<std::string> &List);
+
   /// Get feature bits.
   uint32_t getBits(const SubtargetFeatureKV *CPUTable,
                          size_t CPUTableSize,
diff --git a/lib/Target/SubtargetFeature.cpp b/lib/Target/SubtargetFeature.cpp
index 590574ef398..1085668a762 100644
--- a/lib/Target/SubtargetFeature.cpp
+++ b/lib/Target/SubtargetFeature.cpp
@@ -110,6 +110,33 @@ void SubtargetFeatures::AddFeature(const std::string &String,
   }
 }
 
+/// Add a set of features from the comma-separated string.
+void SubtargetFeatures::AddFeatures(const std::string &String)
+{
+  std::vector<std::string> _Features;
+
+  Split(_Features, String);
+  // Nothing is specified.
+  if (_Features.size() == 0)
+    return;
+
+  for (std::vector<std::string>::iterator it = _Features.begin(),
+          end = _Features.end(); it != end; ++it) {
+    // AddFeature will take care of feature string normalization.
+    AddFeature(*it);
+  }
+}
+
+/// Add a set of features from the parsed command line parameters.
+void SubtargetFeatures::AddFeatures(const cl::list<std::string> &List)
+{
+  for (cl::list<std::string>::const_iterator it = List.begin(),
+          end = List.end(); it != end; ++it) {
+    // AddFeature will take care of feature string normalization.
+    AddFeature(*it);
+  }
+}
+
 /// Find KV in array using binary search.
 template<typename T> const T *Find(const std::string &S, const T *A, size_t L) {
   // Make the lower bound element we're looking for
diff --git a/tools/lto/LTOCodeGenerator.cpp b/tools/lto/LTOCodeGenerator.cpp
index 0b9cb2952e8..f079c2e3601 100644
--- a/tools/lto/LTOCodeGenerator.cpp
+++ b/tools/lto/LTOCodeGenerator.cpp
@@ -304,10 +304,17 @@ bool LTOCodeGenerator::determineTarget(std::string& errMsg)
             break;
         }
 
+        // Prepare subtarget feature set for the given command line options.
+        SubtargetFeatures features;
+
+        // Set the rest of features by default.
+        // Note: Please keep this after all explict feature settings to make sure
+        // defaults will not override explicitly set options.
+        features.AddFeatures(
+            SubtargetFeatures::getDefaultSubtargetFeatures(llvm::Triple(Triple)));
+
         // construct LTModule, hand over ownership of module and target
-        const std::string FeatureStr = 
-            SubtargetFeatures::getDefaultSubtargetFeatures(llvm::Triple(Triple));
-        _target = march->createTargetMachine(Triple, FeatureStr);
+        _target = march->createTargetMachine(Triple, features.getString());
     }
     return false;
 }