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8265325: Optimize StubRoutines::dpow() for Math.pow(x, 0.5)

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Reviewed-by: kvn, neliasso
This commit is contained in:
Jie Fu 2021-04-19 10:45:20 +00:00
parent d1c8c9eabb
commit b64a3fb946
3 changed files with 146 additions and 1 deletions
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34
test/micro/org/openjdk/bench/java/lang/MathBench.java
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@ -60,7 +60,7 @@ public class MathBench {
public int int1 = 1, int2 = 2, int42 = 42, int5 = 5;
public long long1 = 1L, long2 = 2L, long747 = 747L, long13 = 13L;
public float float1 = 1.0f, float2 = 2.0f, floatNegative99 = -99.0f, float7 = 7.0f, eFloat = 2.718f;
public double double1 = 1.0d, double2 = 2.0d, double81 = 81.0d, doubleNegative12 = -12.0d, double4Dot1 = 4.1d;
public double double1 = 1.0d, double2 = 2.0d, double81 = 81.0d, doubleNegative12 = -12.0d, double4Dot1 = 4.1d, double0Dot5 = 0.5d;
@Setup
public void setupValues() {
@ -408,6 +408,38 @@ public class MathBench {
return Math.pow(double4Dot1, double2);
}
@Benchmark
public double powDoubleLoop() {
double sum = 0.0;
for (int i = 0; i < 1000; i++) {
for (int j = 0; j < 1000; j++) {
sum += i + Math.pow(j * 1.0, i * 1.0);
}
}
return sum;
}
@Benchmark
public double powDouble0Dot5() {
return Math.pow(double4Dot1, double0Dot5);
}
@Benchmark
public double powDouble0Dot5Const() {
return Math.pow(double4Dot1, 0.5);
}
@Benchmark
public double powDouble0Dot5Loop() {
double sum = 0.0;
for (int i = 0; i < 1000; i++) {
for (int j = 0; j < 1000; j++) {
sum += i + Math.pow(j * 1.0, 0.5);
}
}
return sum;
}
@Benchmark
public double random() {
return Math.random();