Added tail call optimization to the x86 back end. It can be

[oota-llvm.git] / lib / Target / TargetMachine.cpp

diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp
index 28f3ae88a72516e486f3ff5d75f710bed5b83762..9caea11dd392418a90b32dcfabd8c9bea5c38a73 100644 (file)
--- a/lib/Target/TargetMachine.cpp
+++ b/lib/Target/TargetMachine.cpp
@@ -11,9 +11,9 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/Target/TargetAsmInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
-#include "llvm/Type.h"
 #include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
@@ -26,9 +26,15 @@ namespace llvm {
   bool NoFramePointerElim;
   bool NoExcessFPPrecision;
   bool UnsafeFPMath;
-  bool FiniteOnlyFPMath;
+  bool FiniteOnlyFPMathOption;
+  bool HonorSignDependentRoundingFPMathOption;
+  bool UseSoftFloat;
+  bool NoZerosInBSS;
+  bool ExceptionHandling;
   Reloc::Model RelocationModel;
-};
+  CodeModel::Model CMModel;
+  bool PerformTailCallOpt;
+}
 namespace {
   cl::opt<bool, true> PrintCode("print-machineinstrs",
     cl::desc("Print generated machine code"),
@@ -50,10 +56,33 @@ namespace {
                cl::location(UnsafeFPMath),
                cl::init(false));
   cl::opt<bool, true>
-  EnableFiniteOnltFPMath("enable-finite-only-fp-math",
+  EnableFiniteOnlyFPMath("enable-finite-only-fp-math",
                cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
-               cl::location(FiniteOnlyFPMath),
+               cl::location(FiniteOnlyFPMathOption),
+               cl::init(false));
+  cl::opt<bool, true>
+  EnableHonorSignDependentRoundingFPMath(cl::Hidden,
+               "enable-sign-dependent-rounding-fp-math",
+       cl::desc("Force codegen to assume rounding mode can change dynamically"),
+               cl::location(HonorSignDependentRoundingFPMathOption),
                cl::init(false));
+
+  cl::opt<bool, true>
+  GenerateSoftFloatCalls("soft-float",
+               cl::desc("Generate software floating point library calls"),
+               cl::location(UseSoftFloat),
+               cl::init(false));
+  cl::opt<bool, true>
+  DontPlaceZerosInBSS("nozero-initialized-in-bss",
+              cl::desc("Don't place zero-initialized symbols into bss section"),
+              cl::location(NoZerosInBSS),
+              cl::init(false));
+  cl::opt<bool, true>
+  EnableExceptionHandling("enable-eh",
+               cl::desc("Exception handling should be emitted."),
+               cl::location(ExceptionHandling),
+               cl::init(false));
+
   cl::opt<llvm::Reloc::Model, true>
   DefRelocationModel(
     "relocation-model",
@@ -62,25 +91,46 @@ namespace {
     cl::init(Reloc::Default),
     cl::values(
       clEnumValN(Reloc::Default, "default",
-                 "Target default relocation model"),
+                 "  Target default relocation model"),
       clEnumValN(Reloc::Static, "static",
-                 "Non-relocatable code"),
-      clEnumValN(Reloc::PIC, "pic",
-                 "Fully relocatable, position independent code"),
+                 "  Non-relocatable code"),
+      clEnumValN(Reloc::PIC_, "pic",
+                 "  Fully relocatable, position independent code"),
       clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
-                 "Relocatable external references, non-relocatable code"),
+                 "  Relocatable external references, non-relocatable code"),
+      clEnumValEnd));
+  cl::opt<llvm::CodeModel::Model, true>
+  DefCodeModel(
+    "code-model",
+    cl::desc("Choose code model"),
+    cl::location(CMModel),
+    cl::init(CodeModel::Default),
+    cl::values(
+      clEnumValN(CodeModel::Default, "default",
+                 "  Target default code model"),
+      clEnumValN(CodeModel::Small, "small",
+                 "  Small code model"),
+      clEnumValN(CodeModel::Kernel, "kernel",
+                 "  Kernel code model"),
+      clEnumValN(CodeModel::Medium, "medium",
+                 "  Medium code model"),
+      clEnumValN(CodeModel::Large, "large",
+                 "  Large code model"),
       clEnumValEnd));
-};
+
+  cl::opt<bool, true>
+  EnablePerformTailCallOpt("tailcallopt",
+                           cl::desc("Turn on tail call optimization."),
+                           cl::location(PerformTailCallOpt),
+                           cl::init(false));
+}
 
 //---------------------------------------------------------------------------
 // TargetMachine Class
 //
 
-TargetMachine::TargetMachine(const std::string &name, const Module &M)
-  : Name(name) {
-}
-
 TargetMachine::~TargetMachine() {
+  delete AsmInfo;
 }
 
 /// getRelocationModel - Returns the code generation relocation model. The
@@ -93,3 +143,29 @@ Reloc::Model TargetMachine::getRelocationModel() {
 void TargetMachine::setRelocationModel(Reloc::Model Model) {
   RelocationModel = Model;
 }
+
+/// getCodeModel - Returns the code model. The choices are small, kernel,
+/// medium, large, and target default.
+CodeModel::Model TargetMachine::getCodeModel() {
+  return CMModel;
+}
+
+/// setCodeModel - Sets the code model.
+void TargetMachine::setCodeModel(CodeModel::Model Model) {
+  CMModel = Model;
+}
+
+namespace llvm {
+  /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
+  /// option is specified on the command line. If this returns false (default),
+  /// the code generator is not allowed to assume that FP arithmetic arguments
+  /// and results are never NaNs or +-Infs.
+  bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; }
+  
+  /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
+  /// that the rounding mode of the FPU can change from its default.
+  bool HonorSignDependentRoundingFPMath() {
+    return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
+  }
+}
+