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6506405: Math.abs(float) is slow

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Reviewed-by: darcy
This commit is contained in:
Brian Burkhalter 2021-07-14 15:50:51 +00:00
parent 357fe09f2e
commit c0d4efff3c
4 changed files with 129 additions and 8 deletions
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7
src/java.base/share/classes/java/lang/Math.java
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@ -1527,7 +1527,8 @@ public final class Math {
*/
@IntrinsicCandidate
public static float abs(float a) {
return (a <= 0.0F) ? 0.0F - a : a;
// Convert to bit field form, zero the sign bit, and convert back
return Float.intBitsToFloat(Float.floatToRawIntBits(a) & FloatConsts.MAG_BIT_MASK);
}
/**
@ -1552,7 +1553,9 @@ public final class Math {
*/
@IntrinsicCandidate
public static double abs(double a) {
return (a <= 0.0D) ? 0.0D - a : a;
// Convert to bit field form, zero the sign bit, and convert back
return Double.longBitsToDouble(Double.doubleToRawLongBits(a) & DoubleConsts.MAG_BIT_MASK);
}
/**