From: Glenn Washburn Date: Tue, 15 Dec 2020 23:31:10 +0000 (-0600) Subject: misc: Add grub_log2ull() macro for calculating log base 2 of 64-bit integers X-Git-Tag: grub-2.06-rc1~145 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ab19ba3b1bc71c1b24014af71ec2adef5f8933d;p=thirdparty%2Fgrub.git misc: Add grub_log2ull() macro for calculating log base 2 of 64-bit integers Signed-off-by: Glenn Washburn Reviewed-by: Daniel Kiper --- diff --git a/include/grub/misc.h b/include/grub/misc.h index 780a34e90..1d6124a7a 100644 --- a/include/grub/misc.h +++ b/include/grub/misc.h @@ -482,4 +482,6 @@ 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 */