sign.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2026 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */
 
/**
 * @file sign.c
 * @brief Implements the OP_SIGN opcode returning -1, 0, or 1.
 */
 
case OP_SIGN: {
  Value v = pop_value(vm);
  int out = 0;
  if (v.type == VAL_INT) {
    out = (v.i > 0) - (v.i < 0);
  } else if (v.type == VAL_FLOAT) {
    if (v.d > 0.0)
      out = 1;
    else if (v.d < 0.0)
      out = -1;
    else
      out = 0;
  } else {
    fprintf(stderr, "Runtime type error: SIGN expects number, got %s\n", value_type_name(v.type));
    exit(1);
  }
  free_value(v);
  push_value(vm, make_int(out));
  break;
}