Commit eb26aeb1e5

Andrew Kelley <superjoe30@gmail.com>
2017-08-19 08:29:18
std: better int log2 implementation for number literals
master
1 parent cd2f65f
Changed files (1)
std
math
log2.zig
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);