1 //===-- AllocaHoisting.cpp - Hoist allocas to the entry block --*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Hoist the alloca instructions in the non-entry blocks to the entry blocks. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "NVPTXAllocaHoisting.h" 15 #include "llvm/IR/Constants.h" 16 #include "llvm/IR/Function.h" 17 #include "llvm/IR/Instructions.h" 18 19 namespace llvm { 20 21 bool NVPTXAllocaHoisting::runOnFunction(Function &function) { 22 bool functionModified = false; 23 Function::iterator I = function.begin(); 24 TerminatorInst *firstTerminatorInst = (I++)->getTerminator(); 25 26 for (Function::iterator E = function.end(); I != E; ++I) { 27 for (BasicBlock::iterator BI = I->begin(), BE = I->end(); BI != BE;) { 28 AllocaInst *allocaInst = dyn_cast<AllocaInst>(BI++); 29 if (allocaInst && isa<ConstantInt>(allocaInst->getArraySize())) { 30 allocaInst->moveBefore(firstTerminatorInst); 31 functionModified = true; 32 } 33 } 34 } 35 36 return functionModified; 37 } 38 39 char NVPTXAllocaHoisting::ID = 1; 40 RegisterPass<NVPTXAllocaHoisting> X("alloca-hoisting", 41 "Hoisting alloca instructions in non-entry " 42 "blocks to the entry block"); 43 44 FunctionPass *createAllocaHoisting() { 45 return new NVPTXAllocaHoisting(); 46 } 47 48 } // end namespace llvm 49
