From 330db487ac5260da4f8ecbcb35e4fe46ab840140 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Motiejus=20Jak=C5=A1tys?= <motiejus@jakstys.lt>
Date: Sat, 19 Feb 2022 22:12:49 +0200
Subject: [PATCH] add roundUp assertion

---
 src/padding.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/padding.zig b/src/padding.zig
index 66ff91e..df8017c 100644
--- a/src/padding.zig
+++ b/src/padding.zig
@@ -1,4 +1,5 @@
 const std = @import("std");
+const assert = std.debug.assert;
 
 // rounds up a u12 to the nearest factor of 4 and returns the difference
 // (padding)
@@ -8,6 +9,7 @@ pub fn roundUpPadding(comptime T: type, comptime nbits: u8, n: T) T {
 
 // rounds up a u12 to the nearest factor of 4.
 pub fn roundUp(comptime T: type, comptime nbits: u8, n: T) T {
+    comptime assert(nbits < @bitSizeOf(T));
     const factor = comptime (1 << nbits) - 1;
     return ((n + factor) & ~@as(T, factor));
 }