Simplify and rename function overrideFunctionAttributes. NFC.

This is in preparation to making changes needed to stop resetting
NoFramePointerElim in resetTargetOptions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238079 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/CommandFlags.h

@@ -287,15 +287,4 @@ static inline std::string getFeaturesStr() {
   return Features.getString();
 }
 
-static inline void overrideFunctionAttributes(StringRef CPU, StringRef Features,
-                                              Module &M) {
-  for (auto &F : M) {
-    if (!CPU.empty())
-      llvm::overrideFunctionAttribute("target-cpu", CPU, F);
-
-    if (!Features.empty())
-      llvm::overrideFunctionAttribute("target-features", Features, F);
-  }
-}
-
 #endif

include/llvm/IR/Function.h

@@ -591,9 +591,6 @@ ilist_traits<Argument>::getSymTab(Function *F) {
   return F ? &F->getValueSymbolTable() : nullptr;
 }
 
-/// \brief Overwrite attribute Kind in function F.
-void overrideFunctionAttribute(StringRef Kind, StringRef Value, Function &F);
-
 } // End llvm namespace
 
 #endif

include/llvm/Target/TargetOptions.h

@@ -222,6 +222,10 @@ namespace llvm {
     MCTargetOptions MCOptions;
   };
 
+/// \brief Set function attributes of functions in Module M based on CPU and
+/// Features.
+void setFunctionAttributes(StringRef CPU, StringRef Features, Module &M);
+
 // Comparison operators:
 
 

lib/CodeGen/TargetOptionsImpl.cpp

@@ -51,3 +51,23 @@ bool TargetOptions::HonorSignDependentRoundingFPMath() const {
 StringRef TargetOptions::getTrapFunctionName() const {
   return TrapFuncName;
 }
+
+
+void llvm::setFunctionAttributes(StringRef CPU, StringRef Features, Module &M) {
+  for (auto &F : M) {
+    auto &Ctx = F.getContext();
+    AttributeSet Attrs = F.getAttributes(), NewAttrs;
+
+    if (!CPU.empty())
+      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
+                                       "target-cpu", CPU);
+
+    if (!Features.empty())
+      NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
+                                       "target-features", Features);
+
+    // Let NewAttrs override Attrs.
+    NewAttrs = Attrs.addAttributes(Ctx, AttributeSet::FunctionIndex, NewAttrs);
+    F.setAttributes(NewAttrs);
+  }
+}

lib/IR/Function.cpp

@@ -959,19 +959,6 @@ void Function::setPrologueData(Constant *PrologueData) {
   setValueSubclassData(PDData);
 }
 
-void llvm::overrideFunctionAttribute(StringRef Kind, StringRef Value,
-                                     Function &F) {
-  auto &Ctx = F.getContext();
-  AttributeSet Attrs = F.getAttributes(), AttrsToRemove;
-
-  AttrsToRemove =
-      AttrsToRemove.addAttribute(Ctx, AttributeSet::FunctionIndex, Kind);
-  Attrs = Attrs.removeAttributes(Ctx, AttributeSet::FunctionIndex,
-                                 AttrsToRemove);
-  Attrs = Attrs.addAttribute(Ctx, AttributeSet::FunctionIndex, Kind, Value);
-  F.setAttributes(Attrs);
-}
-
 void Function::setEntryCount(uint64_t Count) {
   MDBuilder MDB(getContext());
   setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count));

tools/llc/llc.cpp

@@ -304,8 +304,8 @@ static int compileModule(char **argv, LLVMContext &Context) {
   if (const DataLayout *DL = Target->getDataLayout())
     M->setDataLayout(*DL);
 
-  // Override function attributes.
-  overrideFunctionAttributes(CPUStr, FeaturesStr, *M);
+  // Override function attributes based on CPUStr and FeaturesStr.
+  setFunctionAttributes(CPUStr, FeaturesStr, *M);
 
   if (RelaxAll.getNumOccurrences() > 0 &&
       FileType != TargetMachine::CGFT_ObjectFile)

tools/opt/opt.cpp

@@ -386,6 +386,7 @@ int main(int argc, char **argv) {
   Triple ModuleTriple(M->getTargetTriple());
   std::string CPUStr, FeaturesStr;
   TargetMachine *Machine = nullptr;
+
   if (ModuleTriple.getArch()) {
     CPUStr = getCPUStr();
     FeaturesStr = getFeaturesStr();
@@ -394,8 +395,8 @@ int main(int argc, char **argv) {
 
   std::unique_ptr<TargetMachine> TM(Machine);
 
-  // Override function attributes.
-  overrideFunctionAttributes(CPUStr, FeaturesStr, *M);
+  // Override function attributes based on CPUStr and FeaturesStr.
+  setFunctionAttributes(CPUStr, FeaturesStr, *M);
 
   // If the output is set to be emitted to standard out, and standard out is a
   // console, print out a warning message and refuse to do it.  We don't