namespace llvm {
class GlobalValue;
+class Loop;
class Type;
class User;
class Value;
/// incurs significant execution cost.
virtual bool isLoweredToCall(const Function *F) const;
+ /// Parameters that control the generic loop unrolling transformation.
+ struct UnrollingPreferences {
+ /// The cost threshold for the unrolled loop, compared to
+ /// CodeMetrics.NumInsts aggregated over all basic blocks in the loop body.
+ /// The unrolling factor is set such that the unrolled loop body does not
+ /// exceed this cost. Set this to UINT_MAX to disable the loop body cost
+ /// restriction.
+ unsigned Threshold;
+ /// The cost threshold for the unrolled loop when optimizing for size (set
+ /// to UINT_MAX to disable).
+ unsigned OptSizeThreshold;
+ /// A forced unrolling factor (the number of concatenated bodies of the
+ /// original loop in the unrolled loop body). When set to 0, the unrolling
+ /// transformation will select an unrolling factor based on the current cost
+ /// threshold and other factors.
+ unsigned Count;
+ /// Allow partial unrolling (unrolling of loops to expand the size of the
+ /// loop body, not only to eliminate small constant-trip-count loops).
+ bool Partial;
+ /// Allow runtime unrolling (unrolling of loops to expand the size of the
+ /// loop body even when the number of loop iterations is not known at compile
+ /// time).
+ bool Runtime;
+ };
+
+ /// \brief Get target-customized preferences for the generic loop unrolling
+ /// transformation. The caller will initialize UP with the current
+ /// target-independent defaults.
+ virtual void getUnrollingPreferences(Loop *L, UnrollingPreferences &UP) const;
+
/// @}
/// \name Scalar Target Information
PSK_FastHardware
};
- /// isLegalAddImmediate - Return true if the specified immediate is legal
- /// add immediate, that is the target has add instructions which can add
- /// a register with the immediate without having to materialize the
- /// immediate into a register.
+ /// \brief Return true if the specified immediate is legal add immediate, that
+ /// is the target has add instructions which can add a register with the
+ /// immediate without having to materialize the immediate into a register.
virtual bool isLegalAddImmediate(int64_t Imm) const;
- /// isLegalICmpImmediate - Return true if the specified immediate is legal
- /// icmp immediate, that is the target has icmp instructions which can compare
- /// a register against the immediate without having to materialize the
- /// immediate into a register.
+ /// \brief Return true if the specified immediate is legal icmp immediate,
+ /// that is the target has icmp instructions which can compare a register
+ /// against the immediate without having to materialize the immediate into a
+ /// register.
virtual bool isLegalICmpImmediate(int64_t Imm) const;
- /// isLegalAddressingMode - Return true if the addressing mode represented by
- /// AM is legal for this target, for a load/store of the specified type.
+ /// \brief Return true if the addressing mode represented by AM is legal for
+ /// this target, for a load/store of the specified type.
/// The type may be VoidTy, in which case only return true if the addressing
/// mode is legal for a load/store of any legal type.
/// TODO: Handle pre/postinc as well.
int64_t BaseOffset, bool HasBaseReg,
int64_t Scale) const;
- /// isTruncateFree - Return true if it's free to truncate a value of
- /// type Ty1 to type Ty2. e.g. On x86 it's free to truncate a i32 value in
- /// register EAX to i16 by referencing its sub-register AX.
+ /// \brief Return true if it's free to truncate a value of type Ty1 to type
+ /// Ty2. e.g. On x86 it's free to truncate a i32 value in register EAX to i16
+ /// by referencing its sub-register AX.
virtual bool isTruncateFree(Type *Ty1, Type *Ty2) const;
- /// Is this type legal.
+ /// \brief Return true if this type is legal.
virtual bool isTypeLegal(Type *Ty) const;
- /// getJumpBufAlignment - returns the target's jmp_buf alignment in bytes
+ /// \brief Returns the target's jmp_buf alignment in bytes.
virtual unsigned getJumpBufAlignment() const;
- /// getJumpBufSize - returns the target's jmp_buf size in bytes.
+ /// \brief Returns the target's jmp_buf size in bytes.
virtual unsigned getJumpBufSize() const;
- /// shouldBuildLookupTables - Return true if switches should be turned into
- /// lookup tables for the target.
+ /// \brief Return true if switches should be turned into lookup tables for the
+ /// target.
virtual bool shouldBuildLookupTables() const;
- /// getPopcntSupport - Return hardware support for population count.
+ /// \brief Return hardware support for population count.
virtual PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const;
- /// haveFastSqrt -- Return true if the hardware has a fast square-root
- /// instruction.
+ /// \brief Return true if the hardware has a fast square-root instruction.
virtual bool haveFastSqrt(Type *Ty) const;
- /// getIntImmCost - Return the expected cost of materializing the given
- /// integer immediate of the specified type.
+ /// \brief Return the expected cost of materializing for the given integer
+ /// immediate of the specified type.
virtual unsigned getIntImmCost(const APInt &Imm, Type *Ty) const;
/// @}
SK_ExtractSubvector ///< ExtractSubvector Index indicates start offset.
};
- /// \brief Additonal information about an operand's possible values.
+ /// \brief Additional information about an operand's possible values.
enum OperandValueKind {
OK_AnyValue, // Operand can have any value.
OK_UniformValue, // Operand is uniform (splat of a value).
unsigned Alignment,
unsigned AddressSpace) const;
+ /// \brief Calculate the cost of performing a vector reduction.
+ ///
+ /// This is the cost of reducing the vector value of type \p Ty to a scalar
+ /// value using the operation denoted by \p Opcode. The form of the reduction
+ /// can either be a pairwise reduction or a reduction that splits the vector
+ /// at every reduction level.
+ ///
+ /// Pairwise:
+ /// (v0, v1, v2, v3)
+ /// ((v0+v1), (v2, v3), undef, undef)
+ /// Split:
+ /// (v0, v1, v2, v3)
+ /// ((v0+v2), (v1+v3), undef, undef)
+ virtual unsigned getReductionCost(unsigned Opcode, Type *Ty,
+ bool IsPairwiseForm) const;
+
/// \returns The cost of Intrinsic instructions.
virtual unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
ArrayRef<Type *> Tys) const;
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