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Got all <=7 lookup permutations working, required a recoloring fix

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The alt pointers change position, but the colors are supposed to stay
the same. If you randomly mix up the colors it sure does make things
confusing.
This commit is contained in:
Christopher Haster
2022-12-27 13:51:06 -06:00
parent e73f1c0e8d
commit 084094116f
2 changed files with 89 additions and 9 deletions
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lfs.c
+8 -9
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@@ -1335,18 +1335,18 @@ static void lfs_rbyd_p_red(
} else if (lfs_rtag_isparallel(p_alts[0], p_alts[2])) {
lfs_rtag_t alt_ = p_alts[1];
lfs_off_t jump_ = p_jumps[1];
p_alts[1] = p_alts[0];
p_alts[1] = lfs_rtag_red(p_alts[0]);
p_jumps[1] = p_jumps[0];
p_alts[0] = alt_;
p_alts[0] = lfs_rtag_black(alt_);
p_jumps[0] = jump_;
} else if (lfs_rtag_isparallel(p_alts[0], p_alts[1])) {
lfs_rtag_t alt_ = p_alts[2];
lfs_off_t jump_ = p_jumps[2];
p_alts[2] = p_alts[1];
p_alts[2] = lfs_rtag_red(p_alts[1]);
p_jumps[2] = p_jumps[1];
p_alts[1] = p_alts[0];
p_alts[1] = lfs_rtag_red(p_alts[0]);
p_jumps[1] = p_jumps[0];
p_alts[0] = alt_;
p_alts[0] = lfs_rtag_black(alt_);
p_jumps[0] = jump_;
} else {
LFS_ASSERT(false);
@@ -1540,20 +1540,19 @@ static int lfs_rbyd_commit(lfs_t *lfs, lfs_rbyd_t *rbyd,
if (tag_ != attr->tag) {
// bias the weights so that lookups always find the
// next biggest tag
lfs_rtag_t alt_;
if (lfs_rtag_weight(tag_) < lfs_rtag_weight(attr->tag)) {
alt_ = LFS_MKRALT(B, LT, lt+1
alt = LFS_MKRALT(B, LT, lt+1
+ lfs_rtag_weight(tag_)
- lfs_rtag_weight(attr->tag));
} else {
alt_ = LFS_MKRALT(B, GT, gt);
alt = LFS_MKRALT(B, GT, gt);
}
lfs_ssize_t delta = lfs_rbyd_p_push(lfs,
&lfs->pcache, &lfs->rcache,
block, off,
p_alts, p_jumps,
alt_, branch, &crc);
alt, branch, &crc);
if (delta < 0) {
return delta;
}