From 6fc33f4d9c860e07ba286154ba6ec22c1b19e620 Mon Sep 17 00:00:00 2001
From: Christopher Haster <chaster@utexas.edu>
Date: Mon, 16 Oct 2017 17:52:35 -0500
Subject: [PATCH] Fixed incorrect instruction in IAR ctz implementation

The RBIT instruction reverses the bits of a word, not REV
---
 littlefs/lfs_util.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/littlefs/lfs_util.h b/littlefs/lfs_util.h
index 3ca878c089..73e9d03ebe 100644
--- a/littlefs/lfs_util.h
+++ b/littlefs/lfs_util.h
@@ -38,7 +38,7 @@ static inline uint32_t lfs_min(uint32_t a, uint32_t b) {
 
 static inline uint32_t lfs_ctz(uint32_t a) {
 #ifdef __ICCARM__
-    return __CLZ(__REV(a));
+    return __CLZ(__RBIT(a));
 #else
     return __builtin_ctz(a);
 #endif