74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/*
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* Copyright (c) 2016 Andrew Kelley
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*
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* This file is part of zig, which is MIT licensed.
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* See http://opensource.org/licenses/MIT
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*/
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#ifndef ZIG_BIGNUM_HPP
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#define ZIG_BIGNUM_HPP
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#include <stdint.h>
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enum BigNumKind {
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BigNumKindInt,
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BigNumKindFloat,
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};
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struct BigNum {
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BigNumKind kind;
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bool is_negative;
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union {
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unsigned long long x_uint;
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double x_float;
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} data;
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};
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void bignum_init_float(BigNum *dest, double x);
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void bignum_init_unsigned(BigNum *dest, uint64_t x);
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void bignum_init_signed(BigNum *dest, int64_t x);
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void bignum_init_bignum(BigNum *dest, BigNum *src);
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bool bignum_fits_in_bits(BigNum *bn, int bit_count, bool is_signed);
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uint64_t bignum_to_twos_complement(BigNum *bn);
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// returns true if overflow happened
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bool bignum_add(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_sub(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_mul(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_div(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_rem(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_or(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_and(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_xor(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_shl(BigNum *dest, BigNum *op1, BigNum *op2);
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bool bignum_shr(BigNum *dest, BigNum *op1, BigNum *op2);
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void bignum_negate(BigNum *dest, BigNum *op);
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void bignum_cast_to_float(BigNum *dest, BigNum *op);
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void bignum_cast_to_int(BigNum *dest, BigNum *op);
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void bignum_not(BigNum *dest, BigNum *op, int bit_count, bool is_signed);
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void bignum_truncate(BigNum *dest, int bit_count);
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// returns the result of the comparison
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bool bignum_cmp_eq(BigNum *op1, BigNum *op2);
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bool bignum_cmp_neq(BigNum *op1, BigNum *op2);
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bool bignum_cmp_lt(BigNum *op1, BigNum *op2);
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bool bignum_cmp_gt(BigNum *op1, BigNum *op2);
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bool bignum_cmp_lte(BigNum *op1, BigNum *op2);
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bool bignum_cmp_gte(BigNum *op1, BigNum *op2);
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// helper functions
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bool bignum_increment_by_scalar(BigNum *bignum, uint64_t scalar);
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bool bignum_multiply_by_scalar(BigNum *bignum, uint64_t scalar);
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struct Buf;
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Buf *bignum_to_buf(BigNum *bn);
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uint32_t bignum_ctz(BigNum *bignum, uint32_t bit_count);
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uint32_t bignum_clz(BigNum *bignum, uint32_t bit_count);
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#endif
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