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introduce bitloops

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This commit is contained in:
mike
2026-01-12 07:07:49 +01:00
parent 7e323040cb
commit f8f1a67a61
2 changed files with 34 additions and 35 deletions
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38
src/main/java/puzzle/SwedishGenerator.java
View File

@@ -175,7 +175,7 @@ public record SwedishGenerator(Rng rng) {
this.hi = hi;
}
static Grid createEmpty() { return new Grid(new byte[SIZE], X, X); }
int digitAt(int index) { return g[index] - 48; }
int digitAt(int index) { return g[index] & ~48; }
public static int r(int offset) { return offset & 7; }
public static int c(int offset) { return offset >>> 3; }
static int offset(int r, int c) { return r | (c << 3); }
@@ -344,38 +344,7 @@ public record SwedishGenerator(Rng rng) {
}
}
static int intersectSorted(int[] a, int aLen, int[] b, int bLen, int[] out) {
if (aLen == 0 || bLen == 0) return 0;
if (aLen < bLen >>> 4) {
int k = 0;
for (int i = 0; i < aLen; i++) {
int x = a[i];
if (Arrays.binarySearch(b, 0, bLen, x) >= 0) out[k++] = x;
}
return k;
}
if (bLen < aLen >>> 4) {
int k = 0;
for (int i = 0; i < bLen; i++) {
int y = b[i];
if (Arrays.binarySearch(a, 0, aLen, y) >= 0) out[k++] = y;
}
return k;
}
int i = 0, j = 0, k = 0, x, y;
while (i < aLen && j < bLen) {
x = a[i];
y = b[j];
if (x == y) {
out[k++] = x;
i++;
j++;
} else if (x < y) i++;
else j++;
}
return k;
}
static record Slot(int key, long packedPos) {
static final int BIT_FOR_DIR = 3;
@@ -428,7 +397,7 @@ public record SwedishGenerator(Rng rng) {
for (int i = 0; i < 65; i += 64) {
for (long bits = (i == 0 ? lo_cl : hi_cl); bits != X; bits &= bits - 1) {
int clueIdx = i + Long.numberOfTrailingZeros(bits);
int clueIdx = i | Long.numberOfTrailingZeros(bits);
var d = grid.digitAt(clueIdx);
var nbrs16 = OFFSETS[d];
long packed = nbrs16.path()[clueIdx];
@@ -778,7 +747,6 @@ public record SwedishGenerator(Rng rng) {
val multiThreaded = Thread.currentThread().getName().contains("pool");
val grid = mask.deepCopyGrid();
val used = new Bit1029();
// val assigned = new HashMap<Integer, Lemma>();
long[] assigned = new long[BIGG];
val ctx = CTX.get();

31
src/test/java/puzzle/SwedishGeneratorTest.java
View File

@@ -161,6 +161,37 @@ public class SwedishGeneratorTest {
assertTrue(Slot.horiz(2)); // right
assertFalse(Slot.horiz(3)); // down
}
static int intersectSorted(int[] a, int aLen, int[] b, int bLen, int[] out) {
if (aLen == 0 || bLen == 0) return 0;
if (aLen < bLen >>> 4) {
int k = 0;
for (int i = 0; i < aLen; i++) {
int x = a[i];
if (Arrays.binarySearch(b, 0, bLen, x) >= 0) out[k++] = x;
}
return k;
}
if (bLen < aLen >>> 4) {
int k = 0;
for (int i = 0; i < bLen; i++) {
int y = b[i];
if (Arrays.binarySearch(a, 0, aLen, y) >= 0) out[k++] = y;
}
return k;
}
int i = 0, j = 0, k = 0, x, y;
while (i < aLen && j < bLen) {
x = a[i];
y = b[j];
if (x == y) {
out[k++] = x;
i++;
j++;
} else if (x < y) i++;
else j++;
}
return k;
}
@Test
void testIntersectSorted() {