mirror of
https://github.com/c64scene-ar/llvm-6502.git
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6229219f7e
This patch adds the isProfitableToHoist API. For AArch64, we want to prevent a fmul from being hoisted in cases where it is more profitable to form a fmsub/fmadd. Phabricator Review: http://reviews.llvm.org/D7299 Patch by Lawrence Hu <lawrence@codeaurora.org> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230241 91177308-0d34-0410-b5e6-96231b3b80d8
434 lines
15 KiB
C++
434 lines
15 KiB
C++
//===- TargetTransformInfoImpl.h --------------------------------*- C++ -*-===//
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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 provides helpers for the implementation of
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/// a TargetTransformInfo-conforming class.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_TARGETTRANSFORMINFOIMPL_H
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#define LLVM_ANALYSIS_TARGETTRANSFORMINFOIMPL_H
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/CallSite.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Operator.h"
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#include "llvm/IR/Type.h"
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namespace llvm {
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/// \brief Base class for use as a mix-in that aids implementing
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/// a TargetTransformInfo-compatible class.
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class TargetTransformInfoImplBase {
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protected:
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typedef TargetTransformInfo TTI;
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const DataLayout *DL;
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explicit TargetTransformInfoImplBase(const DataLayout *DL)
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: DL(DL) {}
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public:
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// Provide value semantics. MSVC requires that we spell all of these out.
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TargetTransformInfoImplBase(const TargetTransformInfoImplBase &Arg)
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: DL(Arg.DL) {}
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TargetTransformInfoImplBase(TargetTransformInfoImplBase &&Arg)
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: DL(std::move(Arg.DL)) {}
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TargetTransformInfoImplBase &
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operator=(const TargetTransformInfoImplBase &RHS) {
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DL = RHS.DL;
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return *this;
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}
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TargetTransformInfoImplBase &operator=(TargetTransformInfoImplBase &&RHS) {
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DL = std::move(RHS.DL);
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return *this;
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}
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unsigned getOperationCost(unsigned Opcode, Type *Ty, Type *OpTy) {
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switch (Opcode) {
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default:
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// By default, just classify everything as 'basic'.
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return TTI::TCC_Basic;
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case Instruction::GetElementPtr:
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llvm_unreachable("Use getGEPCost for GEP operations!");
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case Instruction::BitCast:
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assert(OpTy && "Cast instructions must provide the operand type");
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if (Ty == OpTy || (Ty->isPointerTy() && OpTy->isPointerTy()))
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// Identity and pointer-to-pointer casts are free.
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return TTI::TCC_Free;
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// Otherwise, the default basic cost is used.
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return TTI::TCC_Basic;
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case Instruction::IntToPtr: {
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if (!DL)
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return TTI::TCC_Basic;
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// An inttoptr cast is free so long as the input is a legal integer type
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// which doesn't contain values outside the range of a pointer.
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unsigned OpSize = OpTy->getScalarSizeInBits();
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if (DL->isLegalInteger(OpSize) &&
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OpSize <= DL->getPointerTypeSizeInBits(Ty))
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return TTI::TCC_Free;
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// Otherwise it's not a no-op.
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return TTI::TCC_Basic;
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}
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case Instruction::PtrToInt: {
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if (!DL)
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return TTI::TCC_Basic;
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// A ptrtoint cast is free so long as the result is large enough to store
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// the pointer, and a legal integer type.
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unsigned DestSize = Ty->getScalarSizeInBits();
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if (DL->isLegalInteger(DestSize) &&
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DestSize >= DL->getPointerTypeSizeInBits(OpTy))
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return TTI::TCC_Free;
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// Otherwise it's not a no-op.
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return TTI::TCC_Basic;
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}
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case Instruction::Trunc:
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// trunc to a native type is free (assuming the target has compare and
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// shift-right of the same width).
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if (DL && DL->isLegalInteger(DL->getTypeSizeInBits(Ty)))
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return TTI::TCC_Free;
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return TTI::TCC_Basic;
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}
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}
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unsigned getGEPCost(const Value *Ptr, ArrayRef<const Value *> Operands) {
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// In the basic model, we just assume that all-constant GEPs will be folded
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// into their uses via addressing modes.
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for (unsigned Idx = 0, Size = Operands.size(); Idx != Size; ++Idx)
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if (!isa<Constant>(Operands[Idx]))
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return TTI::TCC_Basic;
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return TTI::TCC_Free;
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}
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unsigned getCallCost(FunctionType *FTy, int NumArgs) {
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assert(FTy && "FunctionType must be provided to this routine.");
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// The target-independent implementation just measures the size of the
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// function by approximating that each argument will take on average one
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// instruction to prepare.
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if (NumArgs < 0)
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// Set the argument number to the number of explicit arguments in the
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// function.
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NumArgs = FTy->getNumParams();
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return TTI::TCC_Basic * (NumArgs + 1);
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}
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<Type *> ParamTys) {
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switch (IID) {
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default:
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// Intrinsics rarely (if ever) have normal argument setup constraints.
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// Model them as having a basic instruction cost.
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// FIXME: This is wrong for libc intrinsics.
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return TTI::TCC_Basic;
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case Intrinsic::annotation:
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case Intrinsic::assume:
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case Intrinsic::dbg_declare:
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case Intrinsic::dbg_value:
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case Intrinsic::invariant_start:
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case Intrinsic::invariant_end:
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end:
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case Intrinsic::objectsize:
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case Intrinsic::ptr_annotation:
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case Intrinsic::var_annotation:
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case Intrinsic::experimental_gc_result_int:
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case Intrinsic::experimental_gc_result_float:
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case Intrinsic::experimental_gc_result_ptr:
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case Intrinsic::experimental_gc_result:
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case Intrinsic::experimental_gc_relocate:
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// These intrinsics don't actually represent code after lowering.
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return TTI::TCC_Free;
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}
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}
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bool hasBranchDivergence() { return false; }
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bool isLoweredToCall(const Function *F) {
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// FIXME: These should almost certainly not be handled here, and instead
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// handled with the help of TLI or the target itself. This was largely
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// ported from existing analysis heuristics here so that such refactorings
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// can take place in the future.
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if (F->isIntrinsic())
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return false;
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if (F->hasLocalLinkage() || !F->hasName())
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return true;
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StringRef Name = F->getName();
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// These will all likely lower to a single selection DAG node.
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if (Name == "copysign" || Name == "copysignf" || Name == "copysignl" ||
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Name == "fabs" || Name == "fabsf" || Name == "fabsl" || Name == "sin" ||
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Name == "fmin" || Name == "fminf" || Name == "fminl" ||
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Name == "fmax" || Name == "fmaxf" || Name == "fmaxl" ||
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Name == "sinf" || Name == "sinl" || Name == "cos" || Name == "cosf" ||
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Name == "cosl" || Name == "sqrt" || Name == "sqrtf" || Name == "sqrtl")
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return false;
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// These are all likely to be optimized into something smaller.
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if (Name == "pow" || Name == "powf" || Name == "powl" || Name == "exp2" ||
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Name == "exp2l" || Name == "exp2f" || Name == "floor" ||
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Name == "floorf" || Name == "ceil" || Name == "round" ||
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Name == "ffs" || Name == "ffsl" || Name == "abs" || Name == "labs" ||
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Name == "llabs")
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return false;
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return true;
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}
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void getUnrollingPreferences(Loop *, TTI::UnrollingPreferences &) {}
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bool isLegalAddImmediate(int64_t Imm) { return false; }
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bool isLegalICmpImmediate(int64_t Imm) { return false; }
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bool isLegalAddressingMode(Type *Ty, GlobalValue *BaseGV, int64_t BaseOffset,
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bool HasBaseReg, int64_t Scale) {
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// Guess that reg+reg addressing is allowed. This heuristic is taken from
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// the implementation of LSR.
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return !BaseGV && BaseOffset == 0 && Scale <= 1;
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}
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bool isLegalMaskedStore(Type *DataType, int Consecutive) { return false; }
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bool isLegalMaskedLoad(Type *DataType, int Consecutive) { return false; }
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int getScalingFactorCost(Type *Ty, GlobalValue *BaseGV, int64_t BaseOffset,
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bool HasBaseReg, int64_t Scale) {
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// Guess that all legal addressing mode are free.
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if (isLegalAddressingMode(Ty, BaseGV, BaseOffset, HasBaseReg, Scale))
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return 0;
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return -1;
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}
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bool isTruncateFree(Type *Ty1, Type *Ty2) { return false; }
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bool isProfitableToHoist(Instruction *I) { return true; }
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bool isTypeLegal(Type *Ty) { return false; }
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unsigned getJumpBufAlignment() { return 0; }
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unsigned getJumpBufSize() { return 0; }
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bool shouldBuildLookupTables() { return true; }
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TTI::PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) {
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return TTI::PSK_Software;
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}
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bool haveFastSqrt(Type *Ty) { return false; }
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unsigned getFPOpCost(Type *Ty) { return TargetTransformInfo::TCC_Basic; }
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unsigned getIntImmCost(const APInt &Imm, Type *Ty) { return TTI::TCC_Basic; }
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unsigned getIntImmCost(unsigned Opcode, unsigned Idx, const APInt &Imm,
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Type *Ty) {
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return TTI::TCC_Free;
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}
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unsigned getIntImmCost(Intrinsic::ID IID, unsigned Idx, const APInt &Imm,
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Type *Ty) {
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return TTI::TCC_Free;
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}
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unsigned getNumberOfRegisters(bool Vector) { return 8; }
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unsigned getRegisterBitWidth(bool Vector) { return 32; }
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unsigned getMaxInterleaveFactor() { return 1; }
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unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty,
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TTI::OperandValueKind Opd1Info,
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TTI::OperandValueKind Opd2Info,
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TTI::OperandValueProperties Opd1PropInfo,
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TTI::OperandValueProperties Opd2PropInfo) {
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return 1;
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}
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unsigned getShuffleCost(TTI::ShuffleKind Kind, Type *Ty, int Index,
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Type *SubTp) {
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return 1;
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}
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unsigned getCastInstrCost(unsigned Opcode, Type *Dst, Type *Src) { return 1; }
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unsigned getCFInstrCost(unsigned Opcode) { return 1; }
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unsigned getCmpSelInstrCost(unsigned Opcode, Type *ValTy, Type *CondTy) {
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return 1;
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}
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unsigned getVectorInstrCost(unsigned Opcode, Type *Val, unsigned Index) {
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return 1;
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}
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unsigned getMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
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unsigned AddressSpace) {
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return 1;
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}
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unsigned getMaskedMemoryOpCost(unsigned Opcode, Type *Src, unsigned Alignment,
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unsigned AddressSpace) {
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return 1;
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}
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unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
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ArrayRef<Type *> Tys) {
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return 1;
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}
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unsigned getNumberOfParts(Type *Tp) { return 0; }
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unsigned getAddressComputationCost(Type *Tp, bool) { return 0; }
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unsigned getReductionCost(unsigned, Type *, bool) { return 1; }
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unsigned getCostOfKeepingLiveOverCall(ArrayRef<Type *> Tys) { return 0; }
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bool getTgtMemIntrinsic(IntrinsicInst *Inst, MemIntrinsicInfo &Info) {
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return false;
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}
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Value *getOrCreateResultFromMemIntrinsic(IntrinsicInst *Inst,
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Type *ExpectedType) {
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return nullptr;
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}
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};
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/// \brief CRTP base class for use as a mix-in that aids implementing
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/// a TargetTransformInfo-compatible class.
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template <typename T>
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class TargetTransformInfoImplCRTPBase : public TargetTransformInfoImplBase {
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private:
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typedef TargetTransformInfoImplBase BaseT;
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protected:
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explicit TargetTransformInfoImplCRTPBase(const DataLayout *DL)
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: BaseT(DL) {}
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public:
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// Provide value semantics. MSVC requires that we spell all of these out.
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TargetTransformInfoImplCRTPBase(const TargetTransformInfoImplCRTPBase &Arg)
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: BaseT(static_cast<const BaseT &>(Arg)) {}
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TargetTransformInfoImplCRTPBase(TargetTransformInfoImplCRTPBase &&Arg)
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: BaseT(std::move(static_cast<BaseT &>(Arg))) {}
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TargetTransformInfoImplCRTPBase &
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operator=(const TargetTransformInfoImplCRTPBase &RHS) {
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BaseT::operator=(static_cast<const BaseT &>(RHS));
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return *this;
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}
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TargetTransformInfoImplCRTPBase &
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operator=(TargetTransformInfoImplCRTPBase &&RHS) {
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BaseT::operator=(std::move(static_cast<BaseT &>(RHS)));
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return *this;
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}
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using BaseT::getCallCost;
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unsigned getCallCost(const Function *F, int NumArgs) {
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assert(F && "A concrete function must be provided to this routine.");
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if (NumArgs < 0)
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// Set the argument number to the number of explicit arguments in the
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// function.
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NumArgs = F->arg_size();
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if (Intrinsic::ID IID = (Intrinsic::ID)F->getIntrinsicID()) {
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FunctionType *FTy = F->getFunctionType();
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SmallVector<Type *, 8> ParamTys(FTy->param_begin(), FTy->param_end());
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return static_cast<T *>(this)
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->getIntrinsicCost(IID, FTy->getReturnType(), ParamTys);
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}
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if (!static_cast<T *>(this)->isLoweredToCall(F))
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return TTI::TCC_Basic; // Give a basic cost if it will be lowered
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// directly.
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return static_cast<T *>(this)->getCallCost(F->getFunctionType(), NumArgs);
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}
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unsigned getCallCost(const Function *F, ArrayRef<const Value *> Arguments) {
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// Simply delegate to generic handling of the call.
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// FIXME: We should use instsimplify or something else to catch calls which
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// will constant fold with these arguments.
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return static_cast<T *>(this)->getCallCost(F, Arguments.size());
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}
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using BaseT::getIntrinsicCost;
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unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
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ArrayRef<const Value *> Arguments) {
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// Delegate to the generic intrinsic handling code. This mostly provides an
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// opportunity for targets to (for example) special case the cost of
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// certain intrinsics based on constants used as arguments.
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SmallVector<Type *, 8> ParamTys;
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ParamTys.reserve(Arguments.size());
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for (unsigned Idx = 0, Size = Arguments.size(); Idx != Size; ++Idx)
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ParamTys.push_back(Arguments[Idx]->getType());
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return static_cast<T *>(this)->getIntrinsicCost(IID, RetTy, ParamTys);
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}
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unsigned getUserCost(const User *U) {
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if (isa<PHINode>(U))
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return TTI::TCC_Free; // Model all PHI nodes as free.
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if (const GEPOperator *GEP = dyn_cast<GEPOperator>(U)) {
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SmallVector<const Value *, 4> Indices(GEP->idx_begin(), GEP->idx_end());
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return static_cast<T *>(this)
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->getGEPCost(GEP->getPointerOperand(), Indices);
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}
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if (ImmutableCallSite CS = U) {
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const Function *F = CS.getCalledFunction();
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if (!F) {
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// Just use the called value type.
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Type *FTy = CS.getCalledValue()->getType()->getPointerElementType();
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return static_cast<T *>(this)
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->getCallCost(cast<FunctionType>(FTy), CS.arg_size());
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}
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SmallVector<const Value *, 8> Arguments(CS.arg_begin(), CS.arg_end());
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return static_cast<T *>(this)->getCallCost(F, Arguments);
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}
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if (const CastInst *CI = dyn_cast<CastInst>(U)) {
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// Result of a cmp instruction is often extended (to be used by other
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// cmp instructions, logical or return instructions). These are usually
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// nop on most sane targets.
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if (isa<CmpInst>(CI->getOperand(0)))
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return TTI::TCC_Free;
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}
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return static_cast<T *>(this)->getOperationCost(
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Operator::getOpcode(U), U->getType(),
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U->getNumOperands() == 1 ? U->getOperand(0)->getType() : nullptr);
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}
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};
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}
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#endif
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