uclamp.c

Go to the documentation of this file.

/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_UCLAMP: {
 /* Unsigned wrap to N bits: mask lower N bits (operand = bits) */
 Value v = pop_value(vm);
 int bits = inst.operand;
 int64_t vi = (v.type == VAL_INT) ? v.i : 0;

 uint64_t mask;
 if (bits <= 0) {
 mask = 0ULL;
 } else if (bits >= 64) {
 mask = UINT64_MAX;
 } else {
 mask = (1ULL << bits) - 1ULL;
 }

 uint64_t wrapped = ((uint64_t)vi) & mask;
 push_value(vm, make_int((int64_t)wrapped));
 free_value(v);
 break;
}