include/intarith: introduce p2aligned()

Signed-off-by: Igor Fedotov <igor.fedotov@croit.io>

diff --git a/src/include/intarith.h b/src/include/intarith.h
index 92f827d88e580b78f6612c320a0566f488f05ffc..42bafcf88b4a40449e0dff740563924959b27447 100644 (file)
--- a/src/include/intarith.h
+++ b/src/include/intarith.h
@@ -57,6 +57,18 @@ constexpr inline T p2align(T x, T align) {
   return x & -align;
 }
 
+/*
+ * return whether x is aligned with (align)
+ * eg, p2aligned(1200, 1024) ==> false
+ * eg, p2aligned(1024, 1024) ==> true
+ * eg, p2aligned(0x1234, 0x100) ==> false
+ * eg, p2aligned(0x5600, 0x100) ==> true
+ */
+template<typename T>
+constexpr inline bool p2aligned(T x, T align) {
+  return p2align(x, align) == x;
+}
+
 /*
  * return x % (mod) align
  * eg, p2phase(0x1234, 0x100) == 0x34 (x-0x12*align)