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8327964: Simplify BigInteger.implMultiplyToLen intrinsic

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Reviewed-by: mdoerr, amitkumar, kvn, fyang
This commit is contained in:
Yudi Zheng 2024-05-27 14:25:13 +00:00 • committed by Martin Doerr
parent 08face8c4c
commit ed81a478e1
17 changed files with 64 additions and 135 deletions
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7
src/java.base/share/classes/java/math/BigInteger.java
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@ -1831,6 +1831,10 @@ public class BigInteger extends Number implements Comparable<BigInteger> {
private static int[] multiplyToLen(int[] x, int xlen, int[] y, int ylen, int[] z) {
multiplyToLenCheck(x, xlen);
multiplyToLenCheck(y, ylen);
if (z == null || z.length < (xlen + ylen))
z = new int[xlen + ylen];
return implMultiplyToLen(x, xlen, y, ylen, z);
}
@ -1839,9 +1843,6 @@ public class BigInteger extends Number implements Comparable<BigInteger> {
int xstart = xlen - 1;
int ystart = ylen - 1;
if (z == null || z.length < (xlen+ ylen))
z = new int[xlen+ylen];
long carry = 0;
for (int j=ystart, k=ystart+1+xstart; j >= 0; j--, k--) {
long product = (y[j] & LONG_MASK) *