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org.jikesrvm.compilers.opt.util
Class Bits

java.lang.Object
  extended by org.jikesrvm.compilers.opt.util.Bits

public class Bits
extends Object

Utilities for manipulating values at the bit-level.

Constructor Summary
Bits()
           
 
Method Summary
static boolean fits(Address val, int bits)
          Does an address literal val fit in bits bits?
static boolean fits(int val, int bits)
          Does an int literal val fit in bits bits?
static boolean fits(long val, int bits)
          Does a long literal val fit in bits bits?
static boolean fits(Offset val, int bits)
          Does an offset literal val fit in bits bits?
static int lower16(int value)
          Return the lower 16 bits (as an int) of an int
static int lower32(long value)
          Return the lower 32 bits (as an int) of a long
static int lower8(int value)
          Return the lower 8 bits (as an int) of an int
static int PPCMaskLower16(int value)
          Return the lower 16 bits to be used in a PPC immediate field
static int PPCMaskLower16(Offset value)
          Return the lower 16 bits to be used in a PPC immediate field
static int PPCMaskUpper16(int value)
          Return the upper 16 bits to be used in a PPC immediate field
static int PPCMaskUpper16(Offset value)
          Return the upper 16 bits to be used in a PPC immediate field, make sure fits in 32 bits
static int upper16(int value)
          Return the upper 16 bits (as an int) of an int
static int upper24(int value)
          Return the upper 24 bits (as an int) of an int
static int upper32(long value)
          Return the upper 32 bits (as an int) of a long
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Bits

public Bits()
Method Detail

PPCMaskLower16

public static int PPCMaskLower16(int value)
Return the lower 16 bits to be used in a PPC immediate field

PPCMaskLower16

public static int PPCMaskLower16(Offset value)
Return the lower 16 bits to be used in a PPC immediate field

PPCMaskUpper16

public static int PPCMaskUpper16(int value)
Return the upper 16 bits to be used in a PPC immediate field

PPCMaskUpper16

public static int PPCMaskUpper16(Offset value)
Return the upper 16 bits to be used in a PPC immediate field, make sure fits in 32 bits

lower8

public static int lower8(int value)
Return the lower 8 bits (as an int) of an int

lower16

public static int lower16(int value)
Return the lower 16 bits (as an int) of an int

upper16

public static int upper16(int value)
Return the upper 16 bits (as an int) of an int

upper24

public static int upper24(int value)
Return the upper 24 bits (as an int) of an int

lower32

public static int lower32(long value)
Return the lower 32 bits (as an int) of a long

upper32

public static int upper32(long value)
Return the upper 32 bits (as an int) of a long

fits

public static boolean fits(long val,
                           int bits)
Does a long literal val fit in bits bits?

fits

public static boolean fits(Offset val,
                           int bits)
Does an offset literal val fit in bits bits?

fits

public static boolean fits(Address val,
                           int bits)
Does an address literal val fit in bits bits?

fits

public static boolean fits(int val,
                           int bits)
Does an int literal val fit in bits bits?

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