Github/littlefs
1
Fork 0
Code Actions Activity

Some minor append cleanup, mostly around follow conditions

Browse Source
This commit is contained in:
Christopher Haster
2023-01-07 02:04:57 -06:00
parent 6a5aae98fc
commit 21012dbb1b
1 changed files with 14 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lfs.c
+14 -12
View File
@@ -610,9 +610,9 @@ static inline bool lfs_rtag_follow_(lfs_rtag_t alt,
lfs_rtag_t lower, lfs_rtag_t upper, lfs_rtag_t tag) {
// TODO should we expect weight as an argument here?
if (lfs_rtag_isgt(alt)) {
return lfs_rtag_weight_(tag) >= upper - lfs_rtag_weight_(alt);
return tag >= upper - lfs_rtag_weight_(alt);
} else {
return lfs_rtag_weight_(tag) < lower + lfs_rtag_weight_(alt);
return tag < lower + lfs_rtag_weight_(alt);
}
}
@@ -1581,8 +1581,11 @@ static int lfs_rbyd_append(lfs_t *lfs, lfs_rbyd_t *rbyd_,
lfs_rtag_t branch_ = lower_branch + delta;
// do bounds want to take different paths? begin cutting
if (!diverged && lfs_rtag_follow_(alt, lower_lower, lower_upper, lower_tag_)
!= lfs_rtag_follow_(alt, lower_lower, lower_upper, upper_tag_)) {
if (!diverged
&& lfs_rtag_follow_(alt,
lower_lower, lower_upper, lower_tag_)
!= lfs_rtag_follow_(alt,
lower_lower, lower_upper, upper_tag_)) {
diverged = true;
upper_branch = lower_branch;
upper_lower = lower_lower;
@@ -1648,7 +1651,8 @@ static int lfs_rbyd_append(lfs_t *lfs, lfs_rbyd_t *rbyd_,
// | | <b | <b |
// | | .-'| | .-'| |
// 1 2 3 4 1 2 3 4 1
if (lfs_rtag_follow_(alt, lower_lower, lower_upper, lower_tag_)) {
if (lfs_rtag_follow_(alt,
lower_lower, lower_upper, lower_tag_)) {
lfs_swap(&alt, &p_alts[0]);
lfs_swap(&jump, &branch_);
lfs_swap(&jump, &p_jumps[0]);
@@ -1691,23 +1695,22 @@ static int lfs_rbyd_append(lfs_t *lfs, lfs_rbyd_t *rbyd_,
// .-'| => .-'|
// 1 2 1 2 1
if (lfs_rtag_isblack(alt)
&& lfs_rtag_follow_(alt, lower_lower, lower_upper, lower_tag_)) {
&& lfs_rtag_follow_(alt,
lower_lower, lower_upper, lower_tag_)) {
alt = lfs_rtag_flip_(alt, lower_lower, lower_upper);
lfs_swap(&jump, &branch_);
}
// should've taken red alt? needs a flip
// TODO should we just get rid of follows and prefer explicit comparisons?
// <r >r
// .----'| .-'|
// | <b => | >b
// | .-'| .--|-'|
// 1 2 3 1 2 3 1
if (p_alts[0]
&& ((lfs_rtag_islt(p_alts[0])
&& lower_tag_ < lower_lower)
|| (lfs_rtag_isgt(p_alts[0])
&& lower_tag_ >= lower_upper))) {
&& lfs_rtag_follow_(
p_alts[0] - lfs_rtag_weight_(p_alts[0]),
lower_lower, lower_upper, lower_tag_)) {
LFS_ASSERT(lfs_rtag_isred(p_alts[0]));
LFS_ASSERT(lfs_rtag_isblack(alt));
@@ -1737,7 +1740,6 @@ static int lfs_rbyd_append(lfs_t *lfs, lfs_rbyd_t *rbyd_,
lower_branch = branch_;
// found end of tree?
// TODO just break? the gotos above are smelly
} else {
// update the tag id
lower_tag_ = lfs_rtag_setid(alt, lfs_rtag_id(lower_upper-1));