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Changes merged from Kawa's gnu.math.

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* java/math/BigInteger.java
	* gnu/gcj/math/MPN.java (rshift0): New method handles zero shift count.
	(rshift(int[],int[],int,int):  Removed - not needed.
	(gcd):  Use rshift0 rather than rshift.
	* java/math/BigInteger.java (setShiftRight):  Likewise.
	(divide):  Simplify by using rshift0.
	(divide):  Zero-extend results if high-order bit set.

From-SVN: r40177
This commit is contained in:
Per Bothner 2001-03-01 22:55:33 -08:00 • committed by Per Bothner
parent d6edb99e92
commit c04278f74f
3 changed files with 44 additions and 35 deletions
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25
libjava/java/math/BigInteger.java
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@ -794,13 +794,7 @@ public class BigInteger extends Number implements Comparable
xwords[xlen++] = 0;
MPN.divide(xwords, xlen, ywords, ylen);
rlen = ylen;
if (remainder != null || rounding_mode != TRUNCATE)
{
if (nshift == 0)
System.arraycopy(xwords, 0, ywords, 0, rlen);
else
MPN.rshift(ywords, xwords, 0, rlen, nshift);
}
MPN.rshift0 (ywords, xwords, 0, rlen, nshift);
qlen = xlen + 1 - ylen;
if (quotient != null)
@ -810,6 +804,12 @@ public class BigInteger extends Number implements Comparable
}
}
if (ywords[rlen-1] < 0)
{
ywords[rlen] = 0;
rlen++;
}
// Now the quotient is in xwords, and the remainder is in ywords.
boolean add_one = false;
@ -1399,15 +1399,10 @@ public class BigInteger extends Number implements Comparable
{
if (words == null || words.length < d_len)
realloc(d_len);
if (count == 0)
System.arraycopy(x.words, word_count, words, 0, d_len);
else
{
MPN.rshift(words, x.words, word_count, d_len, count);
if (neg)
words[d_len-1] |= -1 << (32 - count);
}
MPN.rshift0 (words, x.words, word_count, d_len, count);
ival = d_len;
if (neg)
words[d_len-1] |= -1 << (32 - count);
}
}
}