[PATCH v5 10/11] misc: Add grub_log2ull macro for calculating log base 2 of 64-bit integers

[Glenn Washburn]

Signed-off-by: Glenn Washburn <development@efficientek.com>
---
 include/grub/misc.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/grub/misc.h b/include/grub/misc.h
index b7ca6dd58..85a481f0c 100644
--- a/include/grub/misc.h
+++ b/include/grub/misc.h
@@ -482,4 +482,7 @@ void EXPORT_FUNC(grub_real_boot_time) (const char *file,
 #define grub_max(a, b) (((a) > (b)) ? (a) : (b))
 #define grub_min(a, b) (((a) < (b)) ? (a) : (b))
 
+#define grub_log2ull(n) (GRUB_TYPE_BITS (grub_uint64_t) \
+                         - __builtin_clzll (n) - 1)
+
 #endif /* ! GRUB_MISC_HEADER */
-- 
2.27.0