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8193085: Vectorize the nio Buffer equals and compareTo implementations

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Reviewed-by: alanb
This commit is contained in:
Paul Sandoz 2017-12-20 09:14:52 -08:00
parent 038b5f571c
commit fb9db6b02d
13 changed files with 1122 additions and 195 deletions
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39
src/java.base/share/classes/java/nio/X-Buffer.java.template
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@ -36,6 +36,8 @@ import java.util.stream.StreamSupport;
import java.util.stream.$Streamtype$Stream;
#end[streamableType]
import jdk.internal.util.ArraysSupport;
/**
* $A$ $type$ buffer.
*
@ -287,6 +289,11 @@ public abstract class $Type$Buffer
this(mark, pos, lim, cap, null, 0);
}
@Override
Object base() {
return hb;
}
#if[byte]
/**
@ -1297,19 +1304,9 @@ public abstract class $Type$Buffer
$Type$Buffer that = ($Type$Buffer)ob;
if (this.remaining() != that.remaining())
return false;
int p = this.position();
for (int i = this.limit() - 1, j = that.limit() - 1; i >= p; i--, j--)
if (!equals(this.get(i), that.get(j)))
return false;
return true;
}
private static boolean equals($type$ x, $type$ y) {
#if[floatingPointType]
return (x == y) || ($Fulltype$.isNaN(x) && $Fulltype$.isNaN(y));
#else[floatingPointType]
return x == y;
#end[floatingPointType]
return BufferMismatch.mismatch(this, this.position(),
that, that.position(),
this.remaining()) < 0;
}
/**
@ -1336,11 +1333,11 @@ public abstract class $Type$Buffer
* is less than, equal to, or greater than the given buffer
*/
public int compareTo($Type$Buffer that) {
int n = this.position() + Math.min(this.remaining(), that.remaining());
for (int i = this.position(), j = that.position(); i < n; i++, j++) {
int cmp = compare(this.get(i), that.get(j));
if (cmp != 0)
return cmp;
int i = BufferMismatch.mismatch(this, this.position(),
that, that.position(),
Math.min(this.remaining(), that.remaining()));
if (i >= 0) {
return compare(this.get(this.position() + i), that.get(this.position() + i));
}
return this.remaining() - that.remaining();
}
@ -1571,6 +1568,12 @@ public abstract class $Type$Buffer
#end[!byte]
#if[char]
// The order or null if the buffer does not cover a memory region,
// such as StringCharBuffer
abstract ByteOrder charRegionOrder();
#end[char]
#if[byte]
boolean bigEndian // package-private