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8167065: Add intrinsic support for double precision shifting on x86_64

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Reviewed-by: kvn
This commit is contained in:
Smita Kamath 2019-12-23 14:42:21 -08:00
parent f4af0eadb6
commit 995da6eb2a
22 changed files with 628 additions and 50 deletions
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42
test/micro/org/openjdk/bench/java/math/BigIntegers.java
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@ -45,7 +45,7 @@ import java.util.concurrent.TimeUnit;
@State(Scope.Thread)
public class BigIntegers {
private BigInteger[] hugeArray, largeArray, smallArray;
private BigInteger[] hugeArray, largeArray, smallArray, shiftArray;
public String[] dummyStringArray;
public Object[] dummyArr;
private static final int TESTSIZE = 1000;
@ -53,6 +53,7 @@ public class BigIntegers {
@Setup
public void setup() {
Random r = new Random(1123);
int numbits = r.nextInt(16384);
hugeArray = new BigInteger[TESTSIZE]; /*
* Huge numbers larger than
@ -67,6 +68,10 @@ public class BigIntegers {
* Small number less than
* MAX_INT
*/
shiftArray = new BigInteger[TESTSIZE]; /*
* Each array entry is atmost 16k bits
* in size
*/
dummyStringArray = new String[TESTSIZE];
dummyArr = new Object[TESTSIZE];
@ -78,6 +83,7 @@ public class BigIntegers {
+ ((long) value + (long) Integer.MAX_VALUE));
largeArray[i] = new BigInteger("" + ((long) value + (long) Integer.MAX_VALUE));
smallArray[i] = new BigInteger("" + ((long) value / 1000));
shiftArray[i] = new BigInteger(numbits, r);
}
}
@ -137,4 +143,38 @@ public class BigIntegers {
}
bh.consume(tmp);
}
/** Invokes the shiftLeft method of BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testLeftShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
BigInteger tmp = null;
for (BigInteger s : shiftArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.shiftLeft(shift);
}
bh.consume(tmp);
}
/** Invokes the shiftRight method of BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testRightShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
BigInteger tmp = null;
for (BigInteger s : shiftArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.shiftRight(shift);
}
bh.consume(tmp);
}
}