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java.lang.Objectorg.apfloat.spi.Util
public class Util
Miscellaneous utility methods.
Method Summary | |
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static long |
ifFinite(long x,
long y)
Returns the argument y limited to Apfloat.INFINITE . |
static int |
log2down(int x)
Base-2 logarithm rounded down to nearest power of two. |
static int |
log2down(long x)
Base-2 logarithm rounded down to nearest power of two. |
static int |
log2up(int x)
Base-2 logarithm rounded up to nearest power of two. |
static int |
log2up(long x)
Base-2 logarithm rounded up to nearest power of two. |
static int |
round23down(int x)
Round down to nearest power of two or three times a power of two. |
static long |
round23down(long x)
Round down to nearest power of two or three times a power of two. |
static int |
round23up(int x)
Round up to nearest power of two or three times a power of two. |
static long |
round23up(long x)
Round up to nearest power of two or three times a power of two. |
static int |
round2down(int x)
Round down to nearest power of two. |
static long |
round2down(long x)
Round down to nearest power of two. |
static int |
round2up(int x)
Round up to nearest power of two. |
static long |
round2up(long x)
Round up to nearest power of two. |
static int |
sqrt4down(int x)
Square root rounded down to nearest power of two. |
static long |
sqrt4down(long x)
Square root rounded down to nearest power of two. |
static int |
sqrt4up(int x)
Square root rounded up to nearest power of two. |
static long |
sqrt4up(long x)
Square root rounded up to nearest power of two. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static int round2down(int x)
x
- The input value, which must be non-negative.
x
rounded down to the nearest power of two.public static long round2down(long x)
x
- The input value, which must be non-negative.
x
rounded down to the nearest power of two.public static int round2up(int x)
x
- The input value, which must be non-negative and not greater than 230.
x
rounded up to the nearest power of two.public static long round2up(long x)
x
- The input value, which must be non-negative and not greater than 262.
x
rounded up to the nearest power of two.public static int round23down(int x)
x
- The input value, which must be non-negative.
x
rounded down to nearest power of two or three times a power of two.public static long round23down(long x)
x
- The input value, which must be non-negative.
x
rounded down to nearest power of two or three times a power of two.public static int round23up(int x)
x
- The input value, which must be non-negative and not greater than 3 * 229.
x
rounded up to the nearest power of two or three times a power of two.public static long round23up(long x)
x
- The input value, which must be non-negative and not greater than 3 * 261.
x
rounded up to the nearest power of two or three times a power of two.public static int sqrt4down(int x)
x
- The input value, which must be non-negative.
x
rounded down to nearest power of two.public static long sqrt4down(long x)
x
- The input value, which must be non-negative.
x
rounded down to nearest power of two.public static int sqrt4up(int x)
x
- The input value, which must be non-negative.
x
rounded up to nearest power of two.public static long sqrt4up(long x)
x
- The input value, which must be non-negative.
x
rounded up to nearest power of two.public static int log2down(int x)
x
- The input value, which must be positive.
log2(x)
rounded down to nearest integer.public static int log2down(long x)
x
- The input value, which must be positive.
log2(x)
rounded down to nearest integer.public static int log2up(int x)
x
- The input value, which must be positive.
log2(x)
rounded up to nearest integer.public static int log2up(long x)
x
- The input value, which must be positive.
log2(x)
rounded up to nearest integer.public static long ifFinite(long x, long y)
y
limited to Apfloat.INFINITE
.
In case x
is Apfloat.INFINITE
, then Apfloat.INFINITE
is returned, otherwise y
. Also if y
is negative or zero, this is
treated as a case of overflow, and Apfloat.INFINITE
is returned. The
return value is thus always positive.
x
- The argument that is tested to be Apfloat.INFINITE
.y
- The argument that is returned if x
is not Apfloat.INFINITE
.
(x == Apfloat.INFINITE || y <= 0 ? Apfloat.INFINITE : y)
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