Esempi in C++ (Cpp) per Block::RemoveInstruction

Esempio n. 1

File: Peephole.cpp Progetto: lgratian/compiler

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void Peephole::DeleteDeadInstructions(Function* function) {
	// We process the blocks from last to first, and the instructions
    // in the blocks from last to first too, because it allows deleting 
    // more dead instructions than processing from first to last.
	Block* block = function->LastBlock();

	while(block) {
		Instruction* instr = block->LastInstruction();

		while(instr) {
			Instruction* prevInstr = instr->PreviousInstruction();
            DebugValidator::AreNotEqual(prevInstr, instr);

			// Delete the instruction if we're certain it's dead.
			if(GetSafetyInfo()->IsDefinitelyDead(instr)) {
	            block->RemoveInstruction(instr, true /* free */);
			}

			instr = prevInstr;
		}

		block = block->PreviousBlock();
	}
}