[coreboot-gerrit] Change in coreboot[master]: src/include/lib.h: Add is_power_of_two

[Raul Rangel (Code Review)]

Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/40761 )

Change subject: src/include/lib.h: Add is_power_of_two
......................................................................

src/include/lib.h: Add is_power_of_two

Used to check if a number is a power of two at runtime.

BUG=b:147042464

Signed-off-by: Raul E Rangel 
Change-Id: Ia238773b15b600b7b6062b741a24a93081398a43
---
M src/include/lib.h
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/61/40761/1

diff --git a/src/include/lib.h b/src/include/lib.h
index 168d8ca..f353ce5 100644
--- a/src/include/lib.h
+++ b/src/include/lib.h
@@ -55,4 +55,10 @@
 /* Integer binary logarithm (rounding up): log2_ceil(0) == -1, log2(5) == 3 */
 static inline int log2_ceil(u32 x) { return (x == 0) ? -1 : log2(x * 2 - 1); }

+/* Return 1 if number is power of two */
+static inline unsigned int is_power_of_two(unsigned int x)
+{
+    return (x != 0) && ((x & (x - 1)) == 0);
+}
+
 #endif /* __LIB_H__ */