1 //===- PromoteMemToReg.h - Promote Allocas to Scalars -----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file exposes an interface to promote alloca instructions to SSA
11 // registers, by using the SSA construction algorithm.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
16 #define LLVM_TRANSFORMS_UTILS_PROMOTEMEMTOREG_H
20 template <typename T> class ArrayRef;
23 class AliasSetTracker;
24 class AssumptionCache;
26 /// Return true if this alloca is legal for promotion.
28 /// This is true if there are only loads, stores, and lifetime markers
29 /// (transitively) using this alloca. This also enforces that there is only
30 /// ever one layer of bitcasts or GEPs between the alloca and the lifetime
32 bool isAllocaPromotable(const AllocaInst *AI);
34 /// Promote the specified list of alloca instructions into scalar
35 /// registers, inserting PHI nodes as appropriate.
37 /// This function makes use of DominanceFrontier information. This function
38 /// does not modify the CFG of the function at all. All allocas must be from
39 /// the same function.
41 void PromoteMemToReg(ArrayRef<AllocaInst *> Allocas, DominatorTree &DT,
42 AssumptionCache *AC = nullptr);
44 } // End llvm namespace