Remove warnings when using -Wshorten-64-to-32.

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

diff --git a/lib/VMCore/Instruction.cpp b/lib/VMCore/Instruction.cpp
index 2a740fcc9589ac88f78623b0417062c5ec8f1b90..2316b486898222414b05853233f9ab44e2d12535 100644 (file)
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/VMCore/Instruction.cpp
@@ -2,8 +2,8 @@
 //
 //                     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 is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -13,13 +13,13 @@
 
 #include "llvm/Type.h"
 #include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
 #include "llvm/Function.h"
+#include "llvm/Support/CallSite.h"
 #include "llvm/Support/LeakDetector.h"
 using namespace llvm;
 
 Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
-                         const std::string &Name, Instruction *InsertBefore)
+                         Instruction *InsertBefore)
   : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
   // Make sure that we get added to a basicblock
   LeakDetector::addGarbageObject(this);
@@ -30,11 +30,10 @@ Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
            "Instruction to insert before is not in a basic block!");
     InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
   }
-  setName(Name);
 }
 
 Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
-                         const std::string &Name, BasicBlock *InsertAtEnd)
+                         BasicBlock *InsertAtEnd)
   : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
   // Make sure that we get added to a basicblock
   LeakDetector::addGarbageObject(this);
@@ -42,34 +41,6 @@ Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
   // append this instruction into the basic block
   assert(InsertAtEnd && "Basic block to append to may not be NULL!");
   InsertAtEnd->getInstList().push_back(this);
-  setName(Name);
-}
-
-Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
-                         const char *Name, Instruction *InsertBefore)
-  : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
-  // Make sure that we get added to a basicblock
-  LeakDetector::addGarbageObject(this);
-
-  // If requested, insert this instruction into a basic block...
-  if (InsertBefore) {
-    assert(InsertBefore->getParent() &&
-           "Instruction to insert before is not in a basic block!");
-    InsertBefore->getParent()->getInstList().insert(InsertBefore, this);
-  }
-  if (Name && *Name) setName(Name);
-}
-
-Instruction::Instruction(const Type *ty, unsigned it, Use *Ops, unsigned NumOps,
-                         const char *Name, BasicBlock *InsertAtEnd)
-  : User(ty, Value::InstructionVal + it, Ops, NumOps), Parent(0) {
-  // Make sure that we get added to a basicblock
-  LeakDetector::addGarbageObject(this);
-
-  // append this instruction into the basic block
-  assert(InsertAtEnd && "Basic block to append to may not be NULL!");
-  InsertAtEnd->getInstList().push_back(this);
-  if (Name && *Name) setName(Name);
 }
 
 
@@ -167,6 +138,7 @@ const char *Instruction::getOpcodeName(unsigned OpCode) {
   case ExtractElement: return "extractelement";
   case InsertElement:  return "insertelement";
   case ShuffleVector:  return "shufflevector";
+  case GetResult:      return "getresult";
 
   default: return "<Invalid operator> ";
   }
@@ -226,6 +198,45 @@ bool Instruction::isSameOperationAs(Instruction *I) const {
   return true;
 }
 
+/// isUsedOutsideOfBlock - Return true if there are any uses of I outside of the
+/// specified block.  Note that PHI nodes are considered to evaluate their
+/// operands in the corresponding predecessor block.
+bool Instruction::isUsedOutsideOfBlock(const BasicBlock *BB) const {
+  for (use_const_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
+    // PHI nodes uses values in the corresponding predecessor block.  For other
+    // instructions, just check to see whether the parent of the use matches up.
+    const PHINode *PN = dyn_cast<PHINode>(*UI);
+    if (PN == 0) {
+      if (cast<Instruction>(*UI)->getParent() != BB)
+        return true;
+      continue;
+    }
+    
+    unsigned UseOperand = UI.getOperandNo();
+    if (PN->getIncomingBlock(UseOperand/2) != BB)
+      return true;
+  }
+  return false;    
+}
+
+/// mayReadFromMemory - Return true if this instruction may read memory.
+///
+bool Instruction::mayReadFromMemory() const {
+  switch (getOpcode()) {
+  default: return false;
+  case Instruction::Free:
+  case Instruction::VAArg:
+  case Instruction::Load:
+    return true;
+  case Instruction::Call:
+    return !cast<CallInst>(this)->doesNotAccessMemory();
+  case Instruction::Invoke:
+    return !cast<InvokeInst>(this)->doesNotAccessMemory();
+  case Instruction::Store:
+    return cast<StoreInst>(this)->isVolatile();
+  }
+}
+
 /// mayWriteToMemory - Return true if this instruction may modify memory.
 ///
 bool Instruction::mayWriteToMemory() const {
@@ -233,16 +244,12 @@ bool Instruction::mayWriteToMemory() const {
   default: return false;
   case Instruction::Free:
   case Instruction::Store:
-  case Instruction::Invoke:
   case Instruction::VAArg:
     return true;
   case Instruction::Call:
-    //if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(this)) {
-      // If the intrinsic doesn't write memory, it is safe.
-      // FIXME: this is obviously supposed to determine which  intrinsics 
-      // don't write to memory, but hasn't been implemented yet.
-    //}
-    return true;
+    return !cast<CallInst>(this)->onlyReadsMemory();
+  case Instruction::Invoke:
+    return !cast<InvokeInst>(this)->onlyReadsMemory();
   case Instruction::Load:
     return cast<LoadInst>(this)->isVolatile();
   }
@@ -299,6 +306,7 @@ bool Instruction::isTrapping(unsigned op) {
   case Store:
   case Call:
   case Invoke:
+  case VAArg:
     return true;
   default:
     return false;