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6b6050b229
The default logic does not correctly identify costs of casts because they are marked as custom on x86. For some cases, where the shift amount is a scalar we would be able to generate better code. Unfortunately, when this is the case the value (the splat) will get hoisted out of the loop, thereby making it invisible to ISel. radar://13130673 radar://13537826 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178703 91177308-0d34-0410-b5e6-96231b3b80d8
462 lines
16 KiB
C++
462 lines
16 KiB
C++
//===-- X86TargetTransformInfo.cpp - X86 specific TTI pass ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file implements a TargetTransformInfo analysis pass specific to the
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/// X86 target machine. It uses the target's detailed information to provide
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/// more precise answers to certain TTI queries, while letting the target
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/// independent and default TTI implementations handle the rest.
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///
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "x86tti"
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#include "X86.h"
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#include "X86TargetMachine.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/CostTable.h"
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using namespace llvm;
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// Declare the pass initialization routine locally as target-specific passes
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// don't havve a target-wide initialization entry point, and so we rely on the
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// pass constructor initialization.
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namespace llvm {
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void initializeX86TTIPass(PassRegistry &);
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}
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namespace {
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class X86TTI : public ImmutablePass, public TargetTransformInfo {
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const X86TargetMachine *TM;
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const X86Subtarget *ST;
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const X86TargetLowering *TLI;
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/// Estimate the overhead of scalarizing an instruction. Insert and Extract
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/// are set if the result needs to be inserted and/or extracted from vectors.
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unsigned getScalarizationOverhead(Type *Ty, bool Insert, bool Extract) const;
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public:
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X86TTI() : ImmutablePass(ID), TM(0), ST(0), TLI(0) {
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llvm_unreachable("This pass cannot be directly constructed");
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}
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X86TTI(const X86TargetMachine *TM)
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: ImmutablePass(ID), TM(TM), ST(TM->getSubtargetImpl()),
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TLI(TM->getTargetLowering()) {
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initializeX86TTIPass(*PassRegistry::getPassRegistry());
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}
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virtual void initializePass() {
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pushTTIStack(this);
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}
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virtual void finalizePass() {
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popTTIStack();
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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TargetTransformInfo::getAnalysisUsage(AU);
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}
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/// Pass identification.
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static char ID;
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/// Provide necessary pointer adjustments for the two base classes.
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virtual void *getAdjustedAnalysisPointer(const void *ID) {
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if (ID == &TargetTransformInfo::ID)
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return (TargetTransformInfo*)this;
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return this;
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}
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/// \name Scalar TTI Implementations
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/// @{
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virtual PopcntSupportKind getPopcntSupport(unsigned TyWidth) const;
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/// @}
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/// \name Vector TTI Implementations
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/// @{
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virtual unsigned getNumberOfRegisters(bool Vector) const;
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virtual unsigned getRegisterBitWidth(bool Vector) const;
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virtual unsigned getMaximumUnrollFactor() const;
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virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
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virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
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int Index, Type *SubTp) const;
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virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
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Type *Src) const;
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virtual unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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Type *CondTy) const;
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virtual unsigned getVectorInstrCost(unsigned Opcode, Type *Val,
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unsigned Index) const;
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virtual unsigned getMemoryOpCost(unsigned Opcode, Type *Src,
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unsigned Alignment,
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unsigned AddressSpace) const;
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/// @}
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};
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} // end anonymous namespace
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INITIALIZE_AG_PASS(X86TTI, TargetTransformInfo, "x86tti",
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"X86 Target Transform Info", true, true, false)
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char X86TTI::ID = 0;
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ImmutablePass *
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llvm::createX86TargetTransformInfoPass(const X86TargetMachine *TM) {
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return new X86TTI(TM);
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}
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//===----------------------------------------------------------------------===//
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//
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// X86 cost model.
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//
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//===----------------------------------------------------------------------===//
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X86TTI::PopcntSupportKind X86TTI::getPopcntSupport(unsigned TyWidth) const {
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assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2");
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// TODO: Currently the __builtin_popcount() implementation using SSE3
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// instructions is inefficient. Once the problem is fixed, we should
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// call ST->hasSSE3() instead of ST->hasSSE4().
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return ST->hasSSE41() ? PSK_FastHardware : PSK_Software;
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}
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unsigned X86TTI::getNumberOfRegisters(bool Vector) const {
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if (Vector && !ST->hasSSE1())
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return 0;
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if (ST->is64Bit())
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return 16;
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return 8;
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}
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unsigned X86TTI::getRegisterBitWidth(bool Vector) const {
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if (Vector) {
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if (ST->hasAVX()) return 256;
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if (ST->hasSSE1()) return 128;
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return 0;
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}
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if (ST->is64Bit())
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return 64;
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return 32;
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}
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unsigned X86TTI::getMaximumUnrollFactor() const {
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if (ST->isAtom())
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return 1;
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// Sandybridge and Haswell have multiple execution ports and pipelined
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// vector units.
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if (ST->hasAVX())
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return 4;
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return 2;
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}
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unsigned X86TTI::getArithmeticInstrCost(unsigned Opcode, Type *Ty) const {
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// Legalize the type.
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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static const CostTblEntry<MVT> AVX2CostTable[] = {
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// Shifts on v4i64/v8i32 on AVX2 is legal even though we declare to
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// customize them to detect the cases where shift amount is a scalar one.
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{ ISD::SHL, MVT::v4i32, 1 },
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{ ISD::SRL, MVT::v4i32, 1 },
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{ ISD::SRA, MVT::v4i32, 1 },
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{ ISD::SHL, MVT::v8i32, 1 },
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{ ISD::SRL, MVT::v8i32, 1 },
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{ ISD::SRA, MVT::v8i32, 1 },
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{ ISD::SHL, MVT::v2i64, 1 },
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{ ISD::SRL, MVT::v2i64, 1 },
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{ ISD::SHL, MVT::v4i64, 1 },
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{ ISD::SRL, MVT::v4i64, 1 },
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{ ISD::SHL, MVT::v32i8, 42 }, // cmpeqb sequence.
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{ ISD::SHL, MVT::v16i16, 16*10 }, // Scalarized.
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{ ISD::SRL, MVT::v32i8, 32*10 }, // Scalarized.
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{ ISD::SRL, MVT::v16i16, 8*10 }, // Scalarized.
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{ ISD::SRA, MVT::v32i8, 32*10 }, // Scalarized.
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{ ISD::SRA, MVT::v16i16, 16*10 }, // Scalarized.
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{ ISD::SRA, MVT::v4i64, 4*10 }, // Scalarized.
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};
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// Look for AVX2 lowering tricks.
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if (ST->hasAVX2()) {
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int Idx = CostTableLookup<MVT>(AVX2CostTable, array_lengthof(AVX2CostTable),
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ISD, LT.second);
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if (Idx != -1)
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return LT.first * AVX2CostTable[Idx].Cost;
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}
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static const CostTblEntry<MVT> SSE2CostTable[] = {
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// We don't correctly identify costs of casts because they are marked as
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// custom.
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// For some cases, where the shift amount is a scalar we would be able
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// to generate better code. Unfortunately, when this is the case the value
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// (the splat) will get hoisted out of the loop, thereby making it invisible
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// to ISel. The cost model must return worst case assumptions because it is
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// used for vectorization and we don't want to make vectorized code worse
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// than scalar code.
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{ ISD::SHL, MVT::v16i8, 30 }, // cmpeqb sequence.
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{ ISD::SHL, MVT::v8i16, 8*10 }, // Scalarized.
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{ ISD::SHL, MVT::v4i32, 2*5 }, // We optimized this using mul.
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{ ISD::SHL, MVT::v2i64, 2*10 }, // Scalarized.
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{ ISD::SRL, MVT::v16i8, 16*10 }, // Scalarized.
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{ ISD::SRL, MVT::v8i16, 8*10 }, // Scalarized.
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{ ISD::SRL, MVT::v4i32, 4*10 }, // Scalarized.
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{ ISD::SRL, MVT::v2i64, 2*10 }, // Scalarized.
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{ ISD::SRA, MVT::v16i8, 16*10 }, // Scalarized.
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{ ISD::SRA, MVT::v8i16, 8*10 }, // Scalarized.
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{ ISD::SRA, MVT::v4i32, 4*10 }, // Scalarized.
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{ ISD::SRA, MVT::v2i64, 2*10 }, // Scalarized.
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};
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if (ST->hasSSE2()) {
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int Idx = CostTableLookup<MVT>(SSE2CostTable, array_lengthof(SSE2CostTable),
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ISD, LT.second);
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if (Idx != -1)
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return LT.first * SSE2CostTable[Idx].Cost;
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}
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static const CostTblEntry<MVT> AVX1CostTable[] = {
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// We don't have to scalarize unsupported ops. We can issue two half-sized
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// operations and we only need to extract the upper YMM half.
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// Two ops + 1 extract + 1 insert = 4.
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{ ISD::MUL, MVT::v8i32, 4 },
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{ ISD::SUB, MVT::v8i32, 4 },
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{ ISD::ADD, MVT::v8i32, 4 },
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{ ISD::SUB, MVT::v4i64, 4 },
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{ ISD::ADD, MVT::v4i64, 4 },
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// A v4i64 multiply is custom lowered as two split v2i64 vectors that then
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// are lowered as a series of long multiplies(3), shifts(4) and adds(2)
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// Because we believe v4i64 to be a legal type, we must also include the
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// split factor of two in the cost table. Therefore, the cost here is 18
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// instead of 9.
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{ ISD::MUL, MVT::v4i64, 18 },
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};
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// Look for AVX1 lowering tricks.
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if (ST->hasAVX() && !ST->hasAVX2()) {
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int Idx = CostTableLookup<MVT>(AVX1CostTable, array_lengthof(AVX1CostTable),
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ISD, LT.second);
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if (Idx != -1)
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return LT.first * AVX1CostTable[Idx].Cost;
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}
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// Custom lowering of vectors.
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static const CostTblEntry<MVT> CustomLowered[] = {
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// A v2i64/v4i64 and multiply is custom lowered as a series of long
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// multiplies(3), shifts(4) and adds(2).
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{ ISD::MUL, MVT::v2i64, 9 },
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{ ISD::MUL, MVT::v4i64, 9 },
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};
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int Idx = CostTableLookup<MVT>(CustomLowered, array_lengthof(CustomLowered),
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ISD, LT.second);
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if (Idx != -1)
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return LT.first * CustomLowered[Idx].Cost;
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// Special lowering of v4i32 mul on sse2, sse3: Lower v4i32 mul as 2x shuffle,
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// 2x pmuludq, 2x shuffle.
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if (ISD == ISD::MUL && LT.second == MVT::v4i32 && ST->hasSSE2() &&
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!ST->hasSSE41())
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return 6;
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// Fallback to the default implementation.
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return TargetTransformInfo::getArithmeticInstrCost(Opcode, Ty);
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}
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unsigned X86TTI::getShuffleCost(ShuffleKind Kind, Type *Tp, int Index,
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Type *SubTp) const {
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// We only estimate the cost of reverse shuffles.
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if (Kind != SK_Reverse)
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return TargetTransformInfo::getShuffleCost(Kind, Tp, Index, SubTp);
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Tp);
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unsigned Cost = 1;
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if (LT.second.getSizeInBits() > 128)
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Cost = 3; // Extract + insert + copy.
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// Multiple by the number of parts.
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return Cost * LT.first;
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}
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unsigned X86TTI::getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) const {
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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EVT SrcTy = TLI->getValueType(Src);
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EVT DstTy = TLI->getValueType(Dst);
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if (!SrcTy.isSimple() || !DstTy.isSimple())
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return TargetTransformInfo::getCastInstrCost(Opcode, Dst, Src);
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static const TypeConversionCostTblEntry<MVT> AVXConversionTbl[] = {
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{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i16, 1 },
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{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i16, 1 },
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{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i32, 1 },
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{ ISD::ZERO_EXTEND, MVT::v4i64, MVT::v4i32, 1 },
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{ ISD::TRUNCATE, MVT::v4i32, MVT::v4i64, 1 },
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{ ISD::TRUNCATE, MVT::v8i16, MVT::v8i32, 1 },
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{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i1, 8 },
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{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i8, 8 },
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{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i16, 5 },
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{ ISD::SINT_TO_FP, MVT::v8f32, MVT::v8i32, 1 },
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{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i1, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i8, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i16, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f32, MVT::v4i32, 1 },
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{ ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i1, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i8, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i16, 3 },
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{ ISD::SINT_TO_FP, MVT::v4f64, MVT::v4i32, 1 },
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{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i1, 6 },
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{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i8, 5 },
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{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i16, 5 },
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{ ISD::UINT_TO_FP, MVT::v8f32, MVT::v8i32, 9 },
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{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i1, 7 },
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{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i8, 2 },
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{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i16, 2 },
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{ ISD::UINT_TO_FP, MVT::v4f32, MVT::v4i32, 6 },
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{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i1, 7 },
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{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i8, 2 },
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{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i16, 2 },
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{ ISD::UINT_TO_FP, MVT::v4f64, MVT::v4i32, 6 },
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{ ISD::FP_TO_SINT, MVT::v8i8, MVT::v8f32, 1 },
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{ ISD::FP_TO_SINT, MVT::v4i8, MVT::v4f32, 1 },
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{ ISD::ZERO_EXTEND, MVT::v8i32, MVT::v8i1, 6 },
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{ ISD::SIGN_EXTEND, MVT::v8i32, MVT::v8i1, 9 },
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{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i1, 8 },
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{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i8, 6 },
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{ ISD::SIGN_EXTEND, MVT::v4i64, MVT::v4i16, 6 },
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{ ISD::TRUNCATE, MVT::v8i32, MVT::v8i64, 3 },
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};
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if (ST->hasAVX()) {
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int Idx = ConvertCostTableLookup<MVT>(AVXConversionTbl,
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array_lengthof(AVXConversionTbl),
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ISD, DstTy.getSimpleVT(), SrcTy.getSimpleVT());
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if (Idx != -1)
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return AVXConversionTbl[Idx].Cost;
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}
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return TargetTransformInfo::getCastInstrCost(Opcode, Dst, Src);
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}
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unsigned X86TTI::getCmpSelInstrCost(unsigned Opcode, Type *ValTy,
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Type *CondTy) const {
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// Legalize the type.
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std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(ValTy);
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MVT MTy = LT.second;
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int ISD = TLI->InstructionOpcodeToISD(Opcode);
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assert(ISD && "Invalid opcode");
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static const CostTblEntry<MVT> SSE42CostTbl[] = {
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{ ISD::SETCC, MVT::v2f64, 1 },
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{ ISD::SETCC, MVT::v4f32, 1 },
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{ ISD::SETCC, MVT::v2i64, 1 },
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{ ISD::SETCC, MVT::v4i32, 1 },
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{ ISD::SETCC, MVT::v8i16, 1 },
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{ ISD::SETCC, MVT::v16i8, 1 },
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};
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static const CostTblEntry<MVT> AVX1CostTbl[] = {
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{ ISD::SETCC, MVT::v4f64, 1 },
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{ ISD::SETCC, MVT::v8f32, 1 },
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// AVX1 does not support 8-wide integer compare.
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{ ISD::SETCC, MVT::v4i64, 4 },
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{ ISD::SETCC, MVT::v8i32, 4 },
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{ ISD::SETCC, MVT::v16i16, 4 },
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{ ISD::SETCC, MVT::v32i8, 4 },
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};
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static const CostTblEntry<MVT> AVX2CostTbl[] = {
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{ ISD::SETCC, MVT::v4i64, 1 },
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{ ISD::SETCC, MVT::v8i32, 1 },
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{ ISD::SETCC, MVT::v16i16, 1 },
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{ ISD::SETCC, MVT::v32i8, 1 },
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};
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if (ST->hasAVX2()) {
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int Idx = CostTableLookup<MVT>(AVX2CostTbl, array_lengthof(AVX2CostTbl), ISD, MTy);
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if (Idx != -1)
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return LT.first * AVX2CostTbl[Idx].Cost;
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}
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if (ST->hasAVX()) {
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int Idx = CostTableLookup<MVT>(AVX1CostTbl, array_lengthof(AVX1CostTbl), ISD, MTy);
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if (Idx != -1)
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return LT.first * AVX1CostTbl[Idx].Cost;
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}
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if (ST->hasSSE42()) {
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int Idx = CostTableLookup<MVT>(SSE42CostTbl, array_lengthof(SSE42CostTbl), ISD, MTy);
|
|
if (Idx != -1)
|
|
return LT.first * SSE42CostTbl[Idx].Cost;
|
|
}
|
|
|
|
return TargetTransformInfo::getCmpSelInstrCost(Opcode, ValTy, CondTy);
|
|
}
|
|
|
|
unsigned X86TTI::getVectorInstrCost(unsigned Opcode, Type *Val,
|
|
unsigned Index) const {
|
|
assert(Val->isVectorTy() && "This must be a vector type");
|
|
|
|
if (Index != -1U) {
|
|
// Legalize the type.
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Val);
|
|
|
|
// This type is legalized to a scalar type.
|
|
if (!LT.second.isVector())
|
|
return 0;
|
|
|
|
// The type may be split. Normalize the index to the new type.
|
|
unsigned Width = LT.second.getVectorNumElements();
|
|
Index = Index % Width;
|
|
|
|
// Floating point scalars are already located in index #0.
|
|
if (Val->getScalarType()->isFloatingPointTy() && Index == 0)
|
|
return 0;
|
|
}
|
|
|
|
return TargetTransformInfo::getVectorInstrCost(Opcode, Val, Index);
|
|
}
|
|
|
|
unsigned X86TTI::getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
|
|
unsigned AddressSpace) const {
|
|
// Legalize the type.
|
|
std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Src);
|
|
assert((Opcode == Instruction::Load || Opcode == Instruction::Store) &&
|
|
"Invalid Opcode");
|
|
|
|
// Each load/store unit costs 1.
|
|
unsigned Cost = LT.first * 1;
|
|
|
|
// On Sandybridge 256bit load/stores are double pumped
|
|
// (but not on Haswell).
|
|
if (LT.second.getSizeInBits() > 128 && !ST->hasAVX2())
|
|
Cost*=2;
|
|
|
|
return Cost;
|
|
}
|