util: Add and use util_is_power_of_two_nonzero

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Eduardo Lima Mitev <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/util/bitscan.h b/src/util/bitscan.h
index 2d4e46ec0f1..a3f2d414bd6 100644
--- a/src/util/bitscan.h
+++ b/src/util/bitscan.h
@@ -119,6 +119,17 @@ util_is_power_of_two_or_zero(unsigned v)
    return (v & (v - 1)) == 0;
 }
 
+/* Determine if an unsigned value is a power of two.
+ *
+ * \note
+ * Zero is \b not treated as a power of two.
+ */
+static inline bool
+util_is_power_of_two_nonzero(unsigned v)
+{
+   return v != 0 && (v & (v - 1)) == 0;
+}
+
 /* For looping over a bitmask when you want to loop over consecutive bits
  * manually, for example:
  *