1 //===- PromoteMemToReg.h - Promote Allocas to Scalars -----------*- 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 // This file exposes an interface to promote alloca instructions to SSA
11 // registers, by using the SSA construction algorithm.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #ifndef TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
16 #define TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
17 
18 #include <vector>
19 
20 namespace llvm {
21 
22 class AllocaInst;
23 class DominatorTree;
24 class DominanceFrontier;
25 class AliasSetTracker;
26 
27 /// isAllocaPromotable - Return true if this alloca is legal for promotion.
28 /// This is true if there are only loads and stores to the alloca...
29 ///
30 bool isAllocaPromotable(const AllocaInst *AI);
31 
32 /// PromoteMemToReg - Promote the specified list of alloca instructions into
33 /// scalar registers, inserting PHI nodes as appropriate.  This function makes
34 /// use of DominanceFrontier information.  This function does not modify the CFG
35 /// of the function at all.  All allocas must be from the same function.
36 ///
37 /// If AST is specified, the specified tracker is updated to reflect changes
38 /// made to the IR.
39 ///
40 void PromoteMemToReg(const std::vector<AllocaInst*> &Allocas,
41                      DominatorTree &DT, AliasSetTracker *AST = 0);
42 
43 } // End llvm namespace
44 
45 #endif
46