136f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman//===---- llvm/Analysis/ScalarEvolutionExpander.h - SCEV Exprs --*- C++ -*-===// 236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// 336f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// The LLVM Compiler Infrastructure 436f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// 57ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// This file is distributed under the University of Illinois Open Source 67ed47a13356daed2a34cd2209a31f92552e3bdd8Chris Lattner// License. See LICENSE.TXT for details. 736f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// 836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman//===----------------------------------------------------------------------===// 936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// 1036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// This file defines the classes used to generate code from scalar expressions. 1136f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman// 1236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman//===----------------------------------------------------------------------===// 1336f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 14674be02d525d4e24bc6943ed9274958c580bcfbcJakub Staszak#ifndef LLVM_ANALYSIS_SCALAREVOLUTIONEXPANDER_H 15674be02d525d4e24bc6943ed9274958c580bcfbcJakub Staszak#define LLVM_ANALYSIS_SCALAREVOLUTIONEXPANDER_H 1636f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 1736f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman#include "llvm/Analysis/ScalarEvolutionExpressions.h" 18448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman#include "llvm/Analysis/ScalarEvolutionNormalization.h" 190b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/IRBuilder.h" 20267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman#include "llvm/Support/TargetFolder.h" 21ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman#include "llvm/Support/ValueHandle.h" 2203ee68a145ab5394c070298049d93f305be93ec3Dan Gohman#include <set> 2336f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 2436f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begemannamespace llvm { 25e4ba75f43e2ab1480d119d2d4eb878256274e0fbChandler Carruth class TargetTransformInfo; 26ee98aa87434d9d49a8e4dab41d873888ac9c4805Andrew Trick 27e08c32249fca32cd7b122024a4ca252fcb235694Andrew Trick /// Return true if the given expression is safe to expand in the sense that 28e08c32249fca32cd7b122024a4ca252fcb235694Andrew Trick /// all materialized values are safe to speculate. 29e08c32249fca32cd7b122024a4ca252fcb235694Andrew Trick bool isSafeToExpand(const SCEV *S); 30e08c32249fca32cd7b122024a4ca252fcb235694Andrew Trick 3136f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// SCEVExpander - This class uses information about analyze scalars to 3236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// rewrite expressions in canonical form. 3336f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// 3436f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// Clients should create an instance of this class when rewriting is needed, 354c0d5d5db876b0628bdf6a2174263a1c0a9130e2Dan Gohman /// and destroy it when finished to allow the release of the associated 3636f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// memory. 37a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman class SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> { 3836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman ScalarEvolution &SE; 395e7645be4c9dd2193add44d30b5fef8036d7a3ceAndrew Trick 405e7645be4c9dd2193add44d30b5fef8036d7a3ceAndrew Trick // New instructions receive a name to identifies them with the current pass. 416d64a04a4d1c2f4f6f8877cc0811a4d4386e518fAndrew Trick const char* IVName; 425e7645be4c9dd2193add44d30b5fef8036d7a3ceAndrew Trick 431ba5769676bb14078ddbdb9760523619726800c0Andrew Trick // InsertedExpressions caches Values for reuse, so must track RAUW. 441ba5769676bb14078ddbdb9760523619726800c0Andrew Trick std::map<std::pair<const SCEV *, Instruction *>, TrackingVH<Value> > 45667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman InsertedExpressions; 461ba5769676bb14078ddbdb9760523619726800c0Andrew Trick // InsertedValues only flags inserted instructions so needs no RAUW. 47ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman std::set<AssertingVH<Value> > InsertedValues; 48ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman std::set<AssertingVH<Value> > InsertedPostIncValues; 4936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 509c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman /// RelevantLoops - A memoization of the "relevant" loop for a given SCEV. 519c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman DenseMap<const SCEV *, const Loop *> RelevantLoops; 529c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman 53448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// PostIncLoops - Addrecs referring to any of the given loops are expanded 54448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// in post-inc mode. For example, expanding {1,+,1}<L> in post-inc mode 55448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// returns the add instruction that adds one to the phi for {0,+,1}<L>, 56448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// as opposed to a new phi starting at 1. This is only supported in 57448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// non-canonical mode. 58448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman PostIncLoopSet PostIncLoops; 59a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 60a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// IVIncInsertPos - When this is non-null, addrecs expanded in the 61a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// loop it indicates should be inserted with increments at 62a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// IVIncInsertPos. 63a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman const Loop *IVIncInsertLoop; 64a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 65a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// IVIncInsertPos - When expanding addrecs in the IVIncInsertLoop loop, 66a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// insert the IV increment at this position. 67a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman Instruction *IVIncInsertPos; 68a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 6964925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick /// Phis that complete an IV chain. Reuse 7064925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick std::set<AssertingVH<PHINode> > ChainedPhis; 7164925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick 72a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// CanonicalMode - When true, expressions are expanded in "canonical" 73a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// form. In particular, addrecs are expanded as arithmetic based on 74a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// a canonical induction variable. When false, expression are expanded 75a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// in a more literal form. 76a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman bool CanonicalMode; 77a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 78c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick /// When invoked from LSR, the expander is in "strength reduction" mode. The 79c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick /// only difference is that phi's are only reused if they are already in 80c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick /// "expanded" form. 81c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick bool LSRMode; 82c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick 83267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman typedef IRBuilder<true, TargetFolder> BuilderType; 84267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman BuilderType Builder; 8536f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 86204494149b6f846e8f173f525b129f5508076049Andrew Trick#ifndef NDEBUG 87204494149b6f846e8f173f525b129f5508076049Andrew Trick const char *DebugType; 88204494149b6f846e8f173f525b129f5508076049Andrew Trick#endif 89204494149b6f846e8f173f525b129f5508076049Andrew Trick 9036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman friend struct SCEVVisitor<SCEVExpander, Value*>; 919269926bfb713e92e328e9578c6d8826c68dcb9dDan Gohman 9236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman public: 93a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// SCEVExpander - Construct a SCEVExpander in "canonical" mode. 946d64a04a4d1c2f4f6f8877cc0811a4d4386e518fAndrew Trick explicit SCEVExpander(ScalarEvolution &se, const char *name) 95d152d03a476b8d0d4b26577db26e2ba76034b0f3Andrew Trick : SE(se), IVName(name), IVIncInsertLoop(0), IVIncInsertPos(0), 96c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick CanonicalMode(true), LSRMode(false), 97204494149b6f846e8f173f525b129f5508076049Andrew Trick Builder(se.getContext(), TargetFolder(se.TD)) { 98204494149b6f846e8f173f525b129f5508076049Andrew Trick#ifndef NDEBUG 99204494149b6f846e8f173f525b129f5508076049Andrew Trick DebugType = ""; 100204494149b6f846e8f173f525b129f5508076049Andrew Trick#endif 101204494149b6f846e8f173f525b129f5508076049Andrew Trick } 102204494149b6f846e8f173f525b129f5508076049Andrew Trick 103204494149b6f846e8f173f525b129f5508076049Andrew Trick#ifndef NDEBUG 104204494149b6f846e8f173f525b129f5508076049Andrew Trick void setDebugType(const char* s) { DebugType = s; } 105204494149b6f846e8f173f525b129f5508076049Andrew Trick#endif 1068f9f0d3a34ebbcd6d075fbb1250dc74f36579d50Chris Lattner 10736f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// clear - Erase the contents of the InsertedExpressions map so that users 108d29b6aa608d69f19b57ebd2ae630b040b1c4951dJeff Cohen /// trying to expand the same expression into multiple BasicBlocks or 10936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// different places within the same BasicBlock can do so. 110ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman void clear() { 111ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman InsertedExpressions.clear(); 112ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman InsertedValues.clear(); 113ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman InsertedPostIncValues.clear(); 11464925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick ChainedPhis.clear(); 115ab28928fe276d20cf9533ae6b858497f835c7a53Dan Gohman } 116d29b6aa608d69f19b57ebd2ae630b040b1c4951dJeff Cohen 11736f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// getOrInsertCanonicalInductionVariable - This method returns the 11836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// canonical induction variable of the specified type for the specified 11936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// loop (inserting one if there is none). A canonical induction variable 12036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// starts at zero and steps by one on each iteration. 121c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick PHINode *getOrInsertCanonicalInductionVariable(const Loop *L, Type *Ty); 12236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 123b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick /// getIVIncOperand - Return the induction variable increment's IV operand. 124b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick Instruction *getIVIncOperand(Instruction *IncV, Instruction *InsertPos, 125b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick bool allowScale); 126b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick 127b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick /// hoistIVInc - Utility for hoisting an IV increment. 128b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick bool hoistIVInc(Instruction *IncV, Instruction *InsertPos); 129204494149b6f846e8f173f525b129f5508076049Andrew Trick 130204494149b6f846e8f173f525b129f5508076049Andrew Trick /// replaceCongruentIVs - replace congruent phis with their most canonical 131204494149b6f846e8f173f525b129f5508076049Andrew Trick /// representative. Return the number of phis eliminated. 132204494149b6f846e8f173f525b129f5508076049Andrew Trick unsigned replaceCongruentIVs(Loop *L, const DominatorTree *DT, 133ee98aa87434d9d49a8e4dab41d873888ac9c4805Andrew Trick SmallVectorImpl<WeakVH> &DeadInsts, 134e4ba75f43e2ab1480d119d2d4eb878256274e0fbChandler Carruth const TargetTransformInfo *TTI = NULL); 135204494149b6f846e8f173f525b129f5508076049Andrew Trick 136752ec7da506f5d41c08bd37e195750b57550ce68Dan Gohman /// expandCodeFor - Insert code to directly compute the specified SCEV 137752ec7da506f5d41c08bd37e195750b57550ce68Dan Gohman /// expression into the program. The inserted code is inserted into the 13836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman /// specified block. 139db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *expandCodeFor(const SCEV *SH, Type *Ty, Instruction *I); 14036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 141a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// setIVIncInsertPos - Set the current IV increment loop and position. 142a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman void setIVIncInsertPos(const Loop *L, Instruction *Pos) { 143a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman assert(!CanonicalMode && 144a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman "IV increment positions are not supported in CanonicalMode"); 145a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman IVIncInsertLoop = L; 146a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman IVIncInsertPos = Pos; 147a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman } 148a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 149448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// setPostInc - Enable post-inc expansion for addrecs referring to the 150448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// given loops. Post-inc expansion is only supported in non-canonical 151a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// mode. 152448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman void setPostInc(const PostIncLoopSet &L) { 153a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman assert(!CanonicalMode && 154a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman "Post-inc expansion is not supported in CanonicalMode"); 155448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman PostIncLoops = L; 156448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman } 157448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman 158448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman /// clearPostInc - Disable all post-inc expansion. 159448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman void clearPostInc() { 160448db1cdef5872713ef77beffacf502ae3450cd7Dan Gohman PostIncLoops.clear(); 16125fcaff409f5c4c6da08f148ffb9404a71e8e4a7Dan Gohman 16225fcaff409f5c4c6da08f148ffb9404a71e8e4a7Dan Gohman // When we change the post-inc loop set, cached expansions may no 16325fcaff409f5c4c6da08f148ffb9404a71e8e4a7Dan Gohman // longer be valid. 16425fcaff409f5c4c6da08f148ffb9404a71e8e4a7Dan Gohman InsertedPostIncValues.clear(); 165a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman } 166a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 167a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// disableCanonicalMode - Disable the behavior of expanding expressions in 168a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// canonical form rather than in a more literal form. Non-canonical mode 169a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman /// is useful for late optimization passes. 170a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman void disableCanonicalMode() { CanonicalMode = false; } 171a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 172c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick void enableLSRMode() { LSRMode = true; } 173c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick 174472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman /// clearInsertPoint - Clear the current insertion point. This is useful 175472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman /// if the instruction that had been serving as the insertion point may 176472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman /// have been deleted. 177472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman void clearInsertPoint() { 178472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman Builder.ClearInsertionPoint(); 179472fdf7090bb00af3a3f9dcbe22263120a527533Dan Gohman } 18064925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick 181b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick /// isInsertedInstruction - Return true if the specified instruction was 182b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick /// inserted by the code rewriter. If so, the client should not modify the 183b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick /// instruction. 184b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick bool isInsertedInstruction(Instruction *I) const { 185b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick return InsertedValues.count(I) || InsertedPostIncValues.count(I); 186b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick } 187b5c26ef9da16052597d59a412eaae32098aa1be0Andrew Trick 18864925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick void setChainedPhi(PHINode *PN) { ChainedPhis.insert(PN); } 18964925c55c65f9345a69fb67db07aa62cfb723577Andrew Trick 190267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman private: 191e922c0201916e0b980ab3cfe91e1413e68d55647Owen Anderson LLVMContext &getContext() const { return SE.getContext(); } 1924c0d5d5db876b0628bdf6a2174263a1c0a9130e2Dan Gohman 193267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman /// InsertBinop - Insert the specified binary operator, doing a small amount 194267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman /// of work to avoid inserting an obviously redundant operation. 195267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS, Value *RHS); 196af79fb5f47b0088c6a8973a7fdbaea96973a429dDan Gohman 197485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman /// ReuseOrCreateCast - Arange for there to be a cast of V to Ty at IP, 198485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman /// reusing an existing cast if a suitable one exists, moving an existing 199485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman /// cast if a suitable one exists but isn't in the right place, or 200485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman /// or creating a new one. 201db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *ReuseOrCreateCast(Value *V, Type *Ty, 202485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman Instruction::CastOps Op, 203485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman BasicBlock::iterator IP); 204485c43fc478d5e16c55e14cb2586b56cc1c4c91fDan Gohman 205af79fb5f47b0088c6a8973a7fdbaea96973a429dDan Gohman /// InsertNoopCastOfTo - Insert a cast of V to the specified type, 206267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman /// which must be possible with a noop cast, doing what we can to 207267a385342f2e7388f178b327dd87c5f29afd51bDan Gohman /// share the casts. 208db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *InsertNoopCastOfTo(Value *V, Type *Ty); 209af79fb5f47b0088c6a8973a7fdbaea96973a429dDan Gohman 2105be18e84766fb495b0bde3c8244c1df459a18683Dan Gohman /// expandAddToGEP - Expand a SCEVAddExpr with a pointer type into a GEP 2115be18e84766fb495b0bde3c8244c1df459a18683Dan Gohman /// instead of using ptrtoint+arithmetic+inttoptr. 2120bba49cebc50c7bd4662a4807bcb3ee7f42cb470Dan Gohman Value *expandAddToGEP(const SCEV *const *op_begin, 2130bba49cebc50c7bd4662a4807bcb3ee7f42cb470Dan Gohman const SCEV *const *op_end, 214db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner PointerType *PTy, Type *Ty, Value *V); 2155be18e84766fb495b0bde3c8244c1df459a18683Dan Gohman 216890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *expand(const SCEV *S); 2172d1be87ee40a4a0241d94448173879d9df2bc5b3Dan Gohman 218667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman /// expandCodeFor - Insert code to directly compute the specified SCEV 219667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman /// expression into the program. The inserted code is inserted into the 220667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman /// SCEVExpander's current insertion point. If a type is specified, the 221667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman /// result will be expanded to have that type, with a cast if necessary. 222db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *expandCodeFor(const SCEV *SH, Type *Ty = 0); 223667d787c0a21cf3f5dfcde03ca471162ba35b614Dan Gohman 2249c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman /// getRelevantLoop - Determine the most "relevant" loop for the given SCEV. 2259c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman const Loop *getRelevantLoop(const SCEV *); 2269c9fcfc719158a46cb2e41b66d7dc1a63cd48d74Dan Gohman 227890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitConstant(const SCEVConstant *S) { 22836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman return S->getValue(); 22936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman } 23036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 231890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitTruncateExpr(const SCEVTruncateExpr *S); 23236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 233890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitZeroExtendExpr(const SCEVZeroExtendExpr *S); 23436f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 235890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitSignExtendExpr(const SCEVSignExtendExpr *S); 236d19534add90a2a894af61523b830887097bb780bDan Gohman 237890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitAddExpr(const SCEVAddExpr *S); 23836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 239890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitMulExpr(const SCEVMulExpr *S); 24036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 241890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitUDivExpr(const SCEVUDivExpr *S); 24236f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 243890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitAddRecExpr(const SCEVAddRecExpr *S); 24436f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 245890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitSMaxExpr(const SCEVSMaxExpr *S); 246c54c561c9f7270c055dd7ba75a3a003b771a42d9Nick Lewycky 247890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitUMaxExpr(const SCEVUMaxExpr *S); 2483e6307698084e7adfc10b739442ae29742beefd0Nick Lewycky 249890f92b744fb074465bc2b7006ee753a181f62a4Dan Gohman Value *visitUnknown(const SCEVUnknown *S) { 25036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman return S->getValue(); 25136f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman } 252a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 2531d826a76f591afea445489b9a5485c345e66bf87Dan Gohman void rememberInstruction(Value *I); 254a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman 255455985501381777db03534c925a35e261e356395Dan Gohman void restoreInsertPoint(BasicBlock *BB, BasicBlock::iterator I); 256455985501381777db03534c925a35e261e356395Dan Gohman 257c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick bool isNormalAddRecExprPHI(PHINode *PN, Instruction *IncV, const Loop *L); 258c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick 259365c9f1ff55bef134c6b9707f7df44d680ddabeaAndrew Trick bool isExpandedAddRecExprPHI(PHINode *PN, Instruction *IncV, const Loop *L); 260c5701910604cdf65811fabd31d41e38f1d1d4eb1Andrew Trick 261a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman Value *expandAddRecExprLiterally(const SCEVAddRecExpr *); 262a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman PHINode *getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized, 263a10756ee657a4d43a48cca5c166919093930ed6bDan Gohman const Loop *L, 264db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *ExpandTy, 265db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *IntTy); 266553fe05f236f46fe27b7fcfa822b06367d50183eAndrew Trick Value *expandIVInc(PHINode *PN, Value *StepV, const Loop *L, 267553fe05f236f46fe27b7fcfa822b06367d50183eAndrew Trick Type *ExpandTy, Type *IntTy, bool useSubtract); 26836f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman }; 26936f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman} 27036f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman 27136f891bdf6cf38fcc655a0930ca18664e18518d4Nate Begeman#endif 272