[PATCH 3 of 7 V3] sparse-revlog: add a `index_segment_span` function in C
Boris Feld
boris.feld at octobus.net
Mon Nov 19 09:42:15 UTC 2018
# HG changeset patch
# User Boris Feld <boris.feld at octobus.net>
# Date 1541785396 -3600
# Fri Nov 09 18:43:16 2018 +0100
# Node ID 80a29996df2b2735d1134c7bd18d3e31e10884b3
# Parent 4e94d1562f28f424e68cf98f60bf8006dc3256ba
# EXP-Topic sparse-perf
# Available At https://bitbucket.org/octobus/mercurial-devel/
# hg pull https://bitbucket.org/octobus/mercurial-devel/ -r 80a29996df2b
sparse-revlog: add a `index_segment_span` function in C
We are about to implement a native version of `slicechunktodensity`. For
clarity, we introduce the helper functions first. This new function provides
an efficient way to retrieve some of the information needed by
`slicechunktodensity`.
diff --git a/mercurial/cext/revlog.c b/mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c
+++ b/mercurial/cext/revlog.c
@@ -1030,6 +1030,25 @@ bail:
return NULL;
}
+static inline bool index_segment_span(indexObject *self, Py_ssize_t start_rev,
+ Py_ssize_t end_rev, long *result)
+{
+ long tmp1;
+ long tmp2;
+ long tmp3;
+ if (!index_get_start(self, end_rev, &tmp1)) {
+ return 0;
+ }
+ if (!index_get_start(self, start_rev, &tmp2)) {
+ return 0;
+ }
+ if (!index_get_length(self, end_rev, &tmp3)) {
+ return 0;
+ }
+ *result = tmp1 - tmp2 + tmp3;
+ return 1;
+}
+
static inline int nt_level(const char *node, Py_ssize_t level)
{
int v = node[level >> 1];
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