From 99d484f336ca5a2b4ab718c2180de142a4a082da Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Fri, 6 Oct 2017 23:46:08 +0200
Subject: [PATCH] cpu/cortexm_common: select bitarithm_lsb() by available
instructions
---
cpu/cortexm_common/include/cpu_conf_common.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/cpu/cortexm_common/include/cpu_conf_common.h b/cpu/cortexm_common/include/cpu_conf_common.h
index 8d2d17744e..513d53da09 100644
--- a/cpu/cortexm_common/include/cpu_conf_common.h
+++ b/cpu/cortexm_common/include/cpu_conf_common.h
@@ -57,6 +57,17 @@ extern "C" {
#endif
/** @} */
+/**
+ * @brief Select fastest bitarithm_lsb implementation
+ * @{
+ */
+#ifdef __ARM_FEATURE_CLZ
+#define BITARITHM_LSB_BUILTIN
+#else
+#define BITARITHM_LSB_LOOKUP
+#endif
+/** @} */
+
#ifdef __cplusplus
}
#endif
--
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