From: Uwe Hermann <redacted>
Date: Fri, 18 May 2018 18:14:19 +0000 (+0200)
Subject: srd_inst_find_by_obj(): Minor performance improvement.
X-Git-Url: https://sigrok.org/gitweb/?p=libsigrokdecode.git;a=commitdiff_plain;h=996b17db506ceb435ae3ed53d4c6ac66e10c7b34

srd_inst_find_by_obj(): Minor performance improvement.

Handle the most common case of one session and one decoder first so
we can exit early. This has a small, but measurable performance benefit.
---

diff --git a/type_decoder.c b/type_decoder.c
index cff242c..59fb049 100644
--- a/type_decoder.c
+++ b/type_decoder.c
@@ -256,6 +256,12 @@ static inline struct srd_decoder_inst *srd_inst_find_by_obj(
 	struct srd_session *sess;
 	GSList *l;
 
+	/* Performance shortcut: Handle the most common case first. */
+	sess = sessions->data;
+	di = sess->di_list->data;
+	if (di->py_inst == obj)
+		return di; 
+
 	di = NULL;
 	for (l = sessions; di == NULL && l != NULL; l = l->next) {
 		sess = l->data;