From eb26aeb1e527b5f43f7f789d3a995dca8c73e2e9 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sat, 19 Aug 2017 02:29:18 -0400
Subject: [PATCH] std: better int log2 implementation for number literals

---
 std/math/log2.zig | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/std/math/log2.zig b/std/math/log2.zig
index fecc9e59e17adfb830e390017f3156294c1cf22e..979726442ea741ee2fa7cac53f016acf3036cd2a 100644
--- a/std/math/log2.zig
+++ b/std/math/log2.zig
@@ -26,8 +26,11 @@ fn log2_workaround(x: var) -> @typeOf(x) {
                 else => @compileError("log2 not implemented for " ++ @typeName(T)),
             };
         },
-        TypeId.IntLiteral => {
-            return @typeOf(1)(log2_int(u128, x))
+        TypeId.IntLiteral => comptime {
+            var result = 0;
+            var x_shifted = x;
+            while ({x_shifted >>= 1; x_shifted != 0}) : (result += 1) {}
+            return result;
         },
         TypeId.Int => {
             return log2_int(T, x);
-- 
2.54.0