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introduce bitloops

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mike
2026-01-14 09:28:51 +01:00
parent afd4a7f53c
commit 1a56297986
1 changed files with 46 additions and 22 deletions
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68
src/main/java/puzzle/SwedishGenerator.java
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@@ -285,12 +285,36 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
static int offset(int r, int c) { return r | (c << 3); }
/// the pos will never target a clue
public byte letter32At(int pos) { return g[pos]; }
void setLetter(int idx, byte ch) { g[idx] = ch; }
void setLetterLo(int idx, byte ch) {
lo &= ~(1L << idx);
g[idx] = ch;
}
void setLetterHi(int idx, byte ch) {
hi &= ~(1L << idx & 63);
g[idx] = ch;
}
void setLetter(int idx, byte ch) {
if ((idx & 64)==0)
setLetterLo(idx, ch);
else
setLetterHi(idx, ch);
}
private void clearletter(int idx) { g[idx] = DASH; }
private void clearletterLo(int idx) {
g[idx] = DASH;
lo |= (1L << idx);
}
private void clearletterHi(int idx) {
g[idx] = DASH;
hi |= (1L << idx & 63);
}
void undoPlace(long maskLo, long maskHi) {
for (long b = maskLo; b != 0; b &= b - 1) clearletter(Long.numberOfTrailingZeros(b));
for (long b = maskHi; b != 0; b &= b - 1) clearletter(64 | Long.numberOfTrailingZeros(b));
for (long b = maskLo; b != 0; b &= b - 1) clearletterLo(Long.numberOfTrailingZeros(b));
for (long b = maskHi; b != 0; b &= b - 1) clearletterHi(64 | Long.numberOfTrailingZeros(b));
}
}
@@ -723,24 +747,24 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
}
static long patternForSlot(Grid grid, Slot s) {
/*if ((s.lo & ~grid.lo) == 0 && (s.hi & ~grid.hi) == 0) {
if ((s.lo & ~grid.lo) == 0 && (s.hi & ~grid.hi) == 0) {
return 0;
}*/
}
long p = 0;
if (s.increasing()) {
for (long b = s.lo & ~grid.lo; b != 0; b &= b - 1) {
int idx = Long.numberOfTrailingZeros(b);
int val = grid.g[idx];
if (val != 0) {
int idx = Long.numberOfTrailingZeros(b);
byte val = grid.g[idx];
if (val != DASH) {
int i = Long.bitCount(s.lo & ((1L << idx) - 1));
p |= ((long) (i * 26 + val)) << (i << 3);
}
}
int offset = Long.bitCount(s.lo);
for (long b = s.hi & ~grid.hi; b != 0; b &= b - 1) {
int idx = Long.numberOfTrailingZeros(b);
int val = grid.g[64 | idx];
if (val != 0) {
int idx = Long.numberOfTrailingZeros(b);
byte val = grid.g[64 | idx];
if (val != DASH) {
int i = offset + Long.bitCount(s.hi & ((1L << idx) - 1));
p |= ((long) (i * 26 + val)) << (i << 3);
}
@@ -748,17 +772,17 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
} else {
int offset = Long.bitCount(s.hi);
for (long b = s.hi & ~grid.hi; b != 0; b &= b - 1) {
int idx = Long.numberOfTrailingZeros(b);
int val = grid.g[64 | idx];
if (val != 0) {
int idx = Long.numberOfTrailingZeros(b);
byte val = grid.g[64 | idx];
if (val != DASH) {
int i = Long.bitCount(s.hi & ~((1L << idx) | ((1L << idx) - 1)));
p |= ((long) (i * 26 + val)) << (i << 3);
}
}
for (long b = s.lo & ~grid.lo; b != 0; b &= b - 1) {
int idx = Long.numberOfTrailingZeros(b);
int val = grid.g[idx];
if (val != 0) {
int idx = Long.numberOfTrailingZeros(b);
byte val = grid.g[idx];
if (val != DASH) {
int i = offset + Long.bitCount(s.lo & ~((1L << idx) | ((1L << idx) - 1)));
p |= ((long) (i * 26 + val)) << (i << 3);
}
@@ -781,7 +805,7 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
byte cur = grid.letter32At(idx), ch = Lemma.byteAt(w, i);
if (cur == DASH) {
maskLo |= (1L << idx);
grid.setLetter(idx, ch);
grid.setLetterLo(idx, ch);
} else if (cur != ch) {
grid.undoPlace(maskLo, maskHi);
return false;
@@ -792,7 +816,7 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
byte cur = grid.letter32At(idx), ch = Lemma.byteAt(w, i);
if (cur == DASH) {
maskHi |= (1L << (idx & 63));
grid.setLetter(idx, ch);
grid.setLetterHi(idx, ch);
} else if (cur != ch) {
grid.undoPlace(maskLo, maskHi);
return false;
@@ -805,7 +829,7 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
byte cur = grid.letter32At(idx), ch = Lemma.byteAt(w, i);
if (cur == DASH) {
maskHi |= (1L << msb);
grid.setLetter(idx, ch);
grid.setLetterHi(idx, ch);
} else if (cur != ch) {
grid.undoPlace(maskLo, maskHi);
return false;
@@ -818,7 +842,7 @@ public record SwedishGenerator(Rng rng, int[] stack, Clues cache) {
byte cur = grid.letter32At(idx), ch = Lemma.byteAt(w, i);
if (cur == DASH) {
maskLo |= (1L << msb);
grid.setLetter(idx, ch);
grid.setLetterLo(idx, ch);
} else if (cur != ch) {
grid.undoPlace(maskLo, maskHi);
return false;