51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/**
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* This file is part of the Fun programming language.
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* https://hanez.org/project/fun/
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*
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* Copyright 2025 Johannes Findeisen <you@hanez.org>
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* Licensed under the terms of the ISC license.
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* https://opensource.org/license/isc-license-txt
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*/
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/**
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* @file pow.c
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* @brief Implements the OP_POW opcode for exponentiation in the VM.
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*
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* This file handles the OP_POW instruction, which computes the power of two integer values.
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* The values are popped from the stack, and the result is pushed back.
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*
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* Behavior:
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* - Pops two integer values from the stack.
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* - Computes the power of the first value raised to the second.
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* - Pushes the result onto the stack.
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*
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* Error Handling:
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* - Exits with an error if the operands are not integers.
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*
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* Example:
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* // Bytecode: OP_POW
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* // Stack before: [2, 3]
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* // Stack after: [8]
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*
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* @author Johannes Findeisen
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* @date 2025-10-16
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*/
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case OP_POW: {
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Value b = pop_value(vm);
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Value a = pop_value(vm);
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if (a.type != VAL_INT || b.type != VAL_INT) { fprintf(stderr, "POW expects ints\n"); exit(1); }
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int64_t base = a.i;
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int64_t exp = b.i;
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int64_t res = 1;
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if (exp < 0) { res = 0; } else {
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while (exp > 0) {
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if (exp & 1) res *= base;
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base *= base;
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exp >>= 1;
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}
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}
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push_value(vm, make_int(res));
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free_value(a); free_value(b);
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break;
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}
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