llvm::MCRegisterCostEntry Struct Reference

Specify the cost of a register definition in terms of number of physical register allocated at register renaming stage. More...

#include "llvm/MC/MCSchedule.h"

Public Attributes
unsigned	RegisterClassID
unsigned	Cost
bool	AllowMoveElimination

Detailed Description

Specify the cost of a register definition in terms of number of physical register allocated at register renaming stage.

For example, AMD Jaguar. natively supports 128-bit data types, and operations on 256-bit registers (i.e. YMM registers) are internally split into two COPs (complex operations) and each COP updates a physical register. Basically, on Jaguar, a YMM register write effectively consumes two physical registers. That means, the cost of a YMM write in the BtVer2 model is 2.

Definition at line 151 of file MCSchedule.h.

Member Data Documentation

AllowMoveElimination

bool llvm::MCRegisterCostEntry::AllowMoveElimination

Definition at line 154 of file MCSchedule.h.

Cost

unsigned llvm::MCRegisterCostEntry::Cost

Definition at line 153 of file MCSchedule.h.

RegisterClassID

unsigned llvm::MCRegisterCostEntry::RegisterClassID

Definition at line 152 of file MCSchedule.h.

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The documentation for this struct was generated from the following file:

• include/llvm/MC/MCSchedule.h