//===-- WebAssemblyTargetTransformInfo.cpp - WebAssembly-specific TTI -----===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// /// /// \file /// This file defines the WebAssembly-specific TargetTransformInfo /// implementation. /// //===----------------------------------------------------------------------===// #include "WebAssemblyTargetTransformInfo.h" #include "llvm/CodeGen/CostTable.h" #include "llvm/Support/Debug.h" using namespace llvm; #define DEBUG_TYPE "wasmtti" TargetTransformInfo::PopcntSupportKind WebAssemblyTTIImpl::getPopcntSupport(unsigned TyWidth) const { assert(isPowerOf2_32(TyWidth) && "Ty width must be power of 2"); return TargetTransformInfo::PSK_FastHardware; } unsigned WebAssemblyTTIImpl::getNumberOfRegisters(bool Vector) { unsigned Result = BaseT::getNumberOfRegisters(Vector); // For SIMD, use at least 16 registers, as a rough guess. if (Vector) Result = std::max(Result, 16u); return Result; } unsigned WebAssemblyTTIImpl::getRegisterBitWidth(bool Vector) const { if (Vector && getST()->hasSIMD128()) return 128; return 64; } unsigned WebAssemblyTTIImpl::getArithmeticInstrCost( unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info, TTI::OperandValueKind Opd2Info, TTI::OperandValueProperties Opd1PropInfo, TTI::OperandValueProperties Opd2PropInfo, ArrayRef<const Value *> Args) { unsigned Cost = BasicTTIImplBase<WebAssemblyTTIImpl>::getArithmeticInstrCost( Opcode, Ty, Opd1Info, Opd2Info, Opd1PropInfo, Opd2PropInfo); if (VectorType *VTy = dyn_cast<VectorType>(Ty)) { switch (Opcode) { case Instruction::LShr: case Instruction::AShr: case Instruction::Shl: // SIMD128's shifts currently only accept a scalar shift count. For each // element, we'll need to extract, op, insert. The following is a rough // approxmation. if (Opd2Info != TTI::OK_UniformValue && Opd2Info != TTI::OK_UniformConstantValue) Cost = VTy->getNumElements() * (TargetTransformInfo::TCC_Basic + getArithmeticInstrCost(Opcode, VTy->getElementType()) + TargetTransformInfo::TCC_Basic); break; } } return Cost; } unsigned WebAssemblyTTIImpl::getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) { unsigned Cost = BasicTTIImplBase::getVectorInstrCost(Opcode, Val, Index); // SIMD128's insert/extract currently only take constant indices. if (Index == -1u) return Cost + 25 * TargetTransformInfo::TCC_Expensive; return Cost; } |