diff options
Diffstat (limited to 'lib/Target/ARM/ARMTargetTransformInfo.cpp')
| -rw-r--r-- | lib/Target/ARM/ARMTargetTransformInfo.cpp | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/lib/Target/ARM/ARMTargetTransformInfo.cpp b/lib/Target/ARM/ARMTargetTransformInfo.cpp index 43d7888075b5..f8cae31641ff 100644 --- a/lib/Target/ARM/ARMTargetTransformInfo.cpp +++ b/lib/Target/ARM/ARMTargetTransformInfo.cpp @@ -15,7 +15,6 @@ #include "llvm/Analysis/LoopInfo.h" #include "llvm/CodeGen/CostTable.h" #include "llvm/CodeGen/ISDOpcodes.h" -#include "llvm/CodeGen/MachineValueType.h" #include "llvm/CodeGen/ValueTypes.h" #include "llvm/IR/BasicBlock.h" #include "llvm/IR/CallSite.h" @@ -26,6 +25,7 @@ #include "llvm/IR/Type.h" #include "llvm/MC/SubtargetFeature.h" #include "llvm/Support/Casting.h" +#include "llvm/Support/MachineValueType.h" #include "llvm/Target/TargetMachine.h" #include <algorithm> #include <cassert> @@ -126,6 +126,10 @@ int ARMTTIImpl::getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm, return 0; } + // xor a, -1 can always be folded to MVN + if (Opcode == Instruction::Xor && Imm.isAllOnesValue()) + return 0; + return getIntImmCost(Imm, Ty); } @@ -351,7 +355,7 @@ int ARMTTIImpl::getVectorInstrCost(unsigned Opcode, Type *ValTy, int ARMTTIImpl::getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy, const Instruction *I) { int ISD = TLI->InstructionOpcodeToISD(Opcode); - // On NEON a a vector select gets lowered to vbsl. + // On NEON a vector select gets lowered to vbsl. if (ST->hasNEON() && ValTy->isVectorTy() && ISD == ISD::SELECT) { // Lowering of some vector selects is currently far from perfect. static const TypeConversionCostTblEntry NEONVectorSelectTbl[] = { @@ -396,8 +400,8 @@ int ARMTTIImpl::getAddressComputationCost(Type *Ty, ScalarEvolution *SE, int ARMTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, Type *SubTp) { - // We only handle costs of reverse and alternate shuffles for now. - if (Kind != TTI::SK_Reverse && Kind != TTI::SK_Alternate) + // We only handle costs of reverse and select shuffles for now. + if (Kind != TTI::SK_Reverse && Kind != TTI::SK_Select) return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); if (Kind == TTI::SK_Reverse) { @@ -422,9 +426,9 @@ int ARMTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); } - if (Kind == TTI::SK_Alternate) { - static const CostTblEntry NEONAltShuffleTbl[] = { - // Alt shuffle cost table for ARM. Cost is the number of instructions + if (Kind == TTI::SK_Select) { + static const CostTblEntry NEONSelShuffleTbl[] = { + // Select shuffle cost table for ARM. Cost is the number of instructions // required to create the shuffled vector. {ISD::VECTOR_SHUFFLE, MVT::v2f32, 1}, @@ -441,7 +445,7 @@ int ARMTTIImpl::getShuffleCost(TTI::ShuffleKind Kind, Type *Tp, int Index, {ISD::VECTOR_SHUFFLE, MVT::v16i8, 32}}; std::pair<int, MVT> LT = TLI->getTypeLegalizationCost(DL, Tp); - if (const auto *Entry = CostTableLookup(NEONAltShuffleTbl, + if (const auto *Entry = CostTableLookup(NEONSelShuffleTbl, ISD::VECTOR_SHUFFLE, LT.second)) return LT.first * Entry->Cost; return BaseT::getShuffleCost(Kind, Tp, Index, SubTp); @@ -579,9 +583,9 @@ void ARMTTIImpl::getUnrollingPreferences(Loop *L, ScalarEvolution &SE, SmallVector<BasicBlock*, 4> ExitingBlocks; L->getExitingBlocks(ExitingBlocks); - DEBUG(dbgs() << "Loop has:\n" - << "Blocks: " << L->getNumBlocks() << "\n" - << "Exit blocks: " << ExitingBlocks.size() << "\n"); + LLVM_DEBUG(dbgs() << "Loop has:\n" + << "Blocks: " << L->getNumBlocks() << "\n" + << "Exit blocks: " << ExitingBlocks.size() << "\n"); // Only allow another exit other than the latch. This acts as an early exit // as it mirrors the profitability calculation of the runtime unroller. @@ -612,12 +616,14 @@ void ARMTTIImpl::getUnrollingPreferences(Loop *L, ScalarEvolution &SE, } } - DEBUG(dbgs() << "Cost of loop: " << Cost << "\n"); + LLVM_DEBUG(dbgs() << "Cost of loop: " << Cost << "\n"); UP.Partial = true; UP.Runtime = true; UP.UnrollRemainder = true; UP.DefaultUnrollRuntimeCount = 4; + UP.UnrollAndJam = true; + UP.UnrollAndJamInnerLoopThreshold = 60; // Force unrolling small loops can be very useful because of the branch // taken cost of the backedge. |