LLVM: llvm::IntervalPressure Struct Reference

LLVM API Documentation

#include <RegisterPressure.h>

Inheritance diagram for llvm::IntervalPressure:

Inheritance graph

Collaboration diagram for llvm::IntervalPressure:

Collaboration graph

List of all members.

Public Member Functions
void	reset ()
	Clear the result so it can be used for another round of pressure tracking.
void	openTop (SlotIndex NextTop)
void	openBottom (SlotIndex PrevBottom)
	If the current bottom is not greater than the previous index, open it.
Public Attributes
SlotIndex	TopIdx
	Record the boundary of the region being tracked.
SlotIndex	BottomIdx

Detailed Description

RegisterPressure computed within a region of instructions delimited by TopIdx and BottomIdx. During pressure computation, the maximum pressure per register pressure set is increased. Once pressure within a region is fully computed, the live-in and live-out sets are recorded.

This is preferable to RegionPressure when LiveIntervals are available, because delimiting regions by SlotIndex is more robust and convenient than holding block iterators. The block contents can change without invalidating the pressure result.

Definition at line 65 of file RegisterPressure.h.

Member Function Documentation

void IntervalPressure::openBottom ( SlotIndex PrevBottom )

If the current bottom is not greater than the previous index, open it.

Definition at line 136 of file RegisterPressure.cpp.

References BottomIdx, llvm::SmallVectorImpl< T >::clear(), and llvm::RegisterPressure::LiveInRegs.

void IntervalPressure::openTop ( SlotIndex NextTop )

If the current top is not less than or equal to the next index, open it. We happen to need the SlotIndex for the next top for pressure update.

Definition at line 120 of file RegisterPressure.cpp.

References llvm::SmallVectorImpl< T >::clear(), llvm::RegisterPressure::LiveInRegs, and TopIdx.

void IntervalPressure::reset ( )

Clear the result so it can be used for another round of pressure tracking.

Definition at line 103 of file RegisterPressure.cpp.

References BottomIdx, llvm::SmallVectorImpl< T >::clear(), llvm::RegisterPressure::LiveInRegs, llvm::RegisterPressure::LiveOutRegs, llvm::RegisterPressure::MaxSetPressure, and TopIdx.

Member Data Documentation

SlotIndex llvm::IntervalPressure::BottomIdx

Definition at line 68 of file RegisterPressure.h.

Referenced by openBottom(), and reset().

SlotIndex llvm::IntervalPressure::TopIdx

Record the boundary of the region being tracked.

Definition at line 67 of file RegisterPressure.h.

Referenced by openTop(), and reset().

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