getParent()->getInstList().erase(this);
}
+/// insertBefore - Insert an unlinked instructions into a basic block
+/// immediately before the specified instruction.
+void Instruction::insertBefore(Instruction *InsertPos) {
+ InsertPos->getParent()->getInstList().insert(InsertPos, this);
+}
+
/// moveBefore - Unlink this instruction from its current basic block and
/// insert it into the basic block that MovePos lives in, right before
/// MovePos.
// Other instructions...
case ICmp: return "icmp";
case FCmp: return "fcmp";
+ case VICmp: return "vicmp";
+ case VFCmp: return "vfcmp";
case PHI: return "phi";
case Select: return "select";
case Call: return "call";
case InsertElement: return "insertelement";
case ShuffleVector: return "shufflevector";
case GetResult: return "getresult";
+ case ExtractValue: return "extractvalue";
+ case InsertValue: return "insertvalue";
default: return "<Invalid operator> ";
}
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 {
switch (getOpcode()) {
default: return false;
case Instruction::Free:
- case Instruction::Invoke:
case Instruction::Store:
case Instruction::VAArg:
return true;
case Instruction::Call:
return !cast<CallInst>(this)->onlyReadsMemory();
+ case Instruction::Invoke:
+ return !cast<InvokeInst>(this)->onlyReadsMemory();
case Instruction::Load:
return cast<LoadInst>(this)->isVolatile();
}