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Commit 1d8f2fd8 by Bryce McKinlay Committed by Bryce McKinlay
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Arrays.java (qsort): Fix off-by-one errors and use of incorrect "hi" value when count > 40. 

	* java/util/Arrays.java (qsort): Fix off-by-one errors and use of
	incorrect "hi" value when count > 40.

From-SVN: r51854
parent 014c0998
Showing with 54 additions and 42 deletions
libjava/ChangeLog
2002-04-04 Bryce McKinlay <bryce@waitaki.otago.ac.nz>
* java/util/Arrays.java (qsort): Fix off-by-one errors and use of
incorrect "hi" value when count > 40.
2002-04-03 Mark Wielaard <mark@klomp.org>
* java/lang/reflect/Modifier.java (toString(int,StringBuffer)): Fix
......
libjava/java/util/Arrays.java
......@@ -1078,9 +1078,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1089,8 +1089,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1124,12 +1124,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1137,7 +1138,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -1239,9 +1240,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1250,8 +1251,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1285,12 +1286,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1298,7 +1300,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -1400,9 +1402,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1411,8 +1413,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1446,12 +1448,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1459,7 +1462,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -1573,9 +1576,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1584,8 +1587,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1619,12 +1622,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1632,7 +1636,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -1746,9 +1750,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1757,8 +1761,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1792,12 +1796,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1805,7 +1810,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -1913,9 +1918,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -1924,8 +1929,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -1959,12 +1964,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -1972,7 +1978,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......@@ -2080,9 +2086,9 @@ public class Arrays
if (count > 40)
{ // big arrays, pseudomedian of 9
int s = count / 8;
lo = med3(lo, lo + s, lo + s + s, array);
lo = med3(lo, lo + s, lo + 2 * s, array);
mid = med3(mid - s, mid, mid + s, array);
hi = med3(hi - s - s, hi - s, hi, array);
hi = med3(hi - 2 * s, hi - s, hi, array);
}
mid = med3(lo, mid, hi, array);
......@@ -2091,8 +2097,8 @@ public class Arrays
// Pull the median element out of the fray, and use it as a pivot.
swap(from, mid, array);
a = b = from + 1;
c = d = hi;
a = b = from;
c = d = from + count - 1;
// Repeatedly move b and c to each other, swapping elements so
// that all elements before index b are less than the pivot, and all
......@@ -2126,12 +2132,13 @@ public class Arrays
}
// Swap pivot(s) back in place, the recurse on left and right sections.
hi = from + count;
int span;
span = Math.min(a - from, b - a);
vecswap(from, b - span, span, array);
span = Math.min(d - c, hi - d - 1);
vecswap(b, hi - span + 1, span, array);
vecswap(b, hi - span, span, array);
span = b - a;
if (span > 1)
......@@ -2139,7 +2146,7 @@ public class Arrays
span = d - c;
if (span > 1)
qsort(array, hi - span + 1, span);
qsort(array, hi - span, span);
}
/**
......
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