From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Thu, 7 Mar 2024 17:32:36 +0000 (-0500)
Subject: Implement rseq_hweight_ulong with __builtin_popcountl
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=d9b46e1c0d5d468e68115160b2c3f0ac580b32d7;p=librseq.git

Implement rseq_hweight_ulong with __builtin_popcountl

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I483d53c7c5402e034b8d468e0ed2ab048184f069
---

diff --git a/src/rseq-alloc-utils.h b/src/rseq-alloc-utils.h
index e486dcf..6a57c3d 100644
--- a/src/rseq-alloc-utils.h
+++ b/src/rseq-alloc-utils.h
@@ -110,11 +110,7 @@ long rseq_get_page_len(void)
 static inline
 int rseq_hweight_ulong(unsigned long v)
 {
-	int count;
-
-	for (count = 0; v; count++)
-		v &= v - 1;
-	return count;
+	return __builtin_popcountl(v);
 }
 
 #endif /* _RSEQ_ALLOC_UTILS_H */