org.jikesrvm.compilers.opt.regalloc

Class SimpleSpillCost

java.lang.Object

org.jikesrvm.compilers.opt.regalloc.SpillCostEstimator

org.jikesrvm.compilers.opt.regalloc.SimpleSpillCost

final class SimpleSpillCost
extends SpillCostEstimator

An object that returns an estimate of the relative cost of spilling a symbolic register.

Constructor Summary

Constructors

Constructor and Description
SimpleSpillCost(IR ir)

Method Summary

Modifier and Type	Method and Description
(package private) void	calculate(IR ir) Calculates the estimated cost for each register.
(package private) static boolean	hasBadSizeMemoryOperand(Instruction s) Does instruction s have a memory operand of an inconvenient size?

Methods inherited from class org.jikesrvm.compilers.opt.regalloc.SpillCostEstimator

getCost, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleSpillCost

SimpleSpillCost(IR ir)

Method Detail

calculate

void calculate(IR ir)

Description copied from class: SpillCostEstimator

Calculates the estimated cost for each register.

Specified by:

calculate in class SpillCostEstimator

Parameters:

ir - the IR object

hasBadSizeMemoryOperand

static boolean hasBadSizeMemoryOperand(Instruction s)

Does instruction s have a memory operand of an inconvenient size?

NOTE: This is pretty intel-specific. TODO Refactor to arch/ tree.

Parameters:

s - the instruction to examine

Returns:

true if and only if the instruction has such a memory operand