Add an option to enable the SSA based peephole optimizer.

[oota-llvm.git] / lib / VMCore / Instruction.cpp

diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index ce1423a8631c636f69186e69666aa3d7c6ac732c..2e22bc3641aea224cfedd4a2ccddbde73703062e 100644 (file)
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -1,4 +1,11 @@
-//===-- Instruction.cpp - Implement the Instruction class --------*- C++ -*--=//
+//===-- Instruction.cpp - Implement the Instruction class -----------------===//
+// 
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
 //
 // This file implements the Instruction class for the VMCore library.
 //
@@ -8,6 +15,7 @@
 #include "llvm/SymbolTable.h"
 #include "llvm/Type.h"
 #include "Support/LeakDetector.h"
+using namespace llvm;
 
 Instruction::Instruction(const Type *ty, unsigned it, const std::string &Name,
                          Instruction *InsertBefore)
@@ -56,6 +64,7 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
   case Br:     return "br";
   case Switch: return "switch";
   case Invoke: return "invoke";
+  case Unwind: return "unwind";
     
   // Standard binary operators...
   case Add: return "add";
@@ -86,12 +95,13 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
   case GetElementPtr: return "getelementptr";
     
   // Other instructions...
-  case PHINode: return "phi";
+  case PHI:     return "phi";
   case Cast:    return "cast";
   case Call:    return "call";
   case Shl:     return "shl";
   case Shr:     return "shr";
-  case VarArg:  return "va_arg";
+  case VANext:  return "vanext";
+  case VAArg:   return "vaarg";
 
   default: return "<Invalid operator> ";
   }
@@ -118,7 +128,7 @@ bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) {
 
 /// isCommutative - Return true if the instruction is commutative:
 ///
-///   Commutative operators satistify: (x op y) === (y op x)
+///   Commutative operators satisfy: (x op y) === (y op x)
 ///
 /// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
 /// applied to any type.
@@ -137,3 +147,20 @@ bool Instruction::isCommutative(unsigned op) {
     return false;
   }
 }
+
+
+/// isTrappingInstruction - Return true if the instruction may trap.
+///
+bool Instruction::isTrapping(unsigned op) {
+  switch(op) {
+  case Div:
+  case Rem:
+  case Load:
+  case Store:
+  case Call:
+  case Invoke:
+    return true;
+  default:
+    return false;
+  }
+}