Merge pull request #509 from klickverbot/fix-disable-fp-elim

Bring back -disable-fp-elim.

Author: dnadlinger

driver/cl_options.cpp

@@ -325,6 +325,10 @@ cl::opt<FloatABI::Type> mFloatABI("float-abi",
         clEnumValN(FloatABI::Hard, "hard", "Hardware floating-point ABI and instructions"),
         clEnumValEnd));
 
+cl::opt<bool> disableFpElim("disable-fp-elim",
+              cl::desc("Disable frame pointer elimination optimization"),
+              cl::init(false));
+
 static cl::opt<bool, true, FlagParser> asserts("asserts",
     cl::desc("(*) Enable assertions"),
     cl::value_desc("bool"),

driver/cl_options.h

@@ -61,6 +61,7 @@ namespace opts {
     extern cl::opt<std::string> mTargetTriple;
     extern cl::opt<llvm::Reloc::Model> mRelocModel;
     extern cl::opt<llvm::CodeModel::Model> mCodeModel;
+    extern cl::opt<bool> disableFpElim;
     extern cl::opt<FloatABI::Type> mFloatABI;
     extern cl::opt<bool, true> singleObj;
     extern cl::opt<bool> linkonceTemplates;

driver/main.cpp

@@ -634,7 +634,7 @@ int main(int argc, char **argv)
 
     gTargetMachine = createTargetMachine(mTargetTriple, mArch, mCPU, mAttrs,
         bitness, mFloatABI, mRelocModel, mCodeModel, codeGenOptLevel(),
-        global.params.symdebug);
+        global.params.symdebug || disableFpElim);
 
     {
         llvm::Triple triple = llvm::Triple(gTargetMachine->getTargetTriple());

driver/targetmachine.cpp

@@ -262,7 +262,7 @@ llvm::TargetMachine* createTargetMachine(
     llvm::Reloc::Model relocModel,
     llvm::CodeModel::Model codeModel,
     llvm::CodeGenOpt::Level codeGenOptLevel,
-    bool genDebugInfo)
+    bool noFramePointerElim)
 {
     // Determine target triple. If the user didn't explicitly specify one, use
     // the one set at LLVM configure time.
@@ -362,7 +362,7 @@ llvm::TargetMachine* createTargetMachine(
     }
 
     llvm::TargetOptions targetOptions;
-    targetOptions.NoFramePointerElim = genDebugInfo;
+    targetOptions.NoFramePointerElim = noFramePointerElim;
 
     switch (floatABI)
     {

driver/targetmachine.h

@@ -54,6 +54,6 @@ llvm::TargetMachine* createTargetMachine(
     llvm::Reloc::Model relocModel,
     llvm::CodeModel::Model codeModel,
     llvm::CodeGenOpt::Level codeGenOptLevel,
-    bool genDebugInfo);
+    bool noFramePointerElim);
 
 #endif // LDC_DRIVER_TARGET_H