Odin/core/math/big/example.odin

//+ignore
/*
	Copyright 2021 Jeroen van Rijn <nom@duclavier.com>.
	Made available under Odin's BSD-3 license.

	A BigInt implementation in Odin.
	For the theoretical underpinnings, see Knuth's The Art of Computer Programming, Volume 2, section 4.3.
	The code started out as an idiomatic source port of libTomMath, which is in the public domain, with thanks.
*/
package math_big


import "core:fmt"
import "core:mem"

print_configation :: proc() {
	fmt.printf(
`
Configuration:
	_DIGIT_BITS                           %v
	_SMALL_MEMORY                         %v
	_MIN_DIGIT_COUNT                      %v
	_MAX_DIGIT_COUNT                      %v
	_DEFAULT_DIGIT_COUNT                  %v
	_MAX_COMBA                            %v
	_WARRAY                               %v
	_TAB_SIZE                             %v
	_MAX_WIN_SIZE                         %v
Runtime tunable:
	MUL_KARATSUBA_CUTOFF                  %v
	SQR_KARATSUBA_CUTOFF                  %v
	MUL_TOOM_CUTOFF                       %v
	SQR_TOOM_CUTOFF                       %v
	MAX_ITERATIONS_ROOT_N                 %v
	FACTORIAL_MAX_N                       %v
	FACTORIAL_BINARY_SPLIT_CUTOFF         %v
	FACTORIAL_BINARY_SPLIT_MAX_RECURSIONS %v

`, _DIGIT_BITS,
_LOW_MEMORY,
_MIN_DIGIT_COUNT,
_MAX_DIGIT_COUNT,
_DEFAULT_DIGIT_COUNT,
_MAX_COMBA,
_WARRAY,
_TAB_SIZE,
_MAX_WIN_SIZE,
MUL_KARATSUBA_CUTOFF,
SQR_KARATSUBA_CUTOFF,
MUL_TOOM_CUTOFF,
SQR_TOOM_CUTOFF,
MAX_ITERATIONS_ROOT_N,
FACTORIAL_MAX_N,
FACTORIAL_BINARY_SPLIT_CUTOFF,
FACTORIAL_BINARY_SPLIT_MAX_RECURSIONS,
);

}

print :: proc(name: string, a: ^Int, base := i8(10), print_name := true, newline := true, print_extra_info := false) {
	assert_if_nil(a);

	as, err := itoa(a, base);
	defer delete(as);

	cb := internal_count_bits(a);
	if print_name {
		fmt.printf("%v", name);
	}
	if err != nil {
		fmt.printf("%v (error: %v | %v)", name, err, a);
	}
	fmt.printf("%v", as);
	if print_extra_info {
		fmt.printf(" (base: %v, bits: %v (digits: %v), flags: %v)", base, cb, a.used, a.flags);
	}
	if newline {
		fmt.println();
	}
}

int_to_byte :: proc(v: ^Int) {
	err: Error;
	size: int;
	print("v: ", v);
	fmt.println();

	t := &Int{};
	defer destroy(t);

	if size, err = int_to_bytes_size(v); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b1 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_big(v, b1);
	int_from_bytes_big(t, b1);
	fmt.printf("big: %v | err: %v\n", b1, err);

	int_from_bytes_big(t, b1);
	if internal_cmp_mag(t, v) != 0 {
		print("\tError parsing t: ", t);
	}

	if size, err = int_to_bytes_size(v); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b2 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_big_python(v, b2);
	fmt.printf("big python: %v | err: %v\n", b2, err);

	if err == nil {
		int_from_bytes_big_python(t, b2);
		if internal_cmp_mag(t, v) != 0 {
			print("\tError parsing t: ", t);
		}
	}

	if size, err = int_to_bytes_size(v, true); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b3 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_big(v, b3, true);
	fmt.printf("big signed: %v | err: %v\n", b3, err);

	int_from_bytes_big(t, b3, true);
	if internal_cmp(t, v) != 0 {
		print("\tError parsing t: ", t);
	}

	if size, err = int_to_bytes_size(v, true); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b4 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_big_python(v, b4, true);
	fmt.printf("big signed python: %v | err: %v\n", b4, err);

	int_from_bytes_big_python(t, b4, true);
	if internal_cmp(t, v) != 0 {
		print("\tError parsing t: ", t);
	}
}

int_to_byte_little :: proc(v: ^Int) {
	err: Error;
	size: int;
	print("v: ", v);
	fmt.println();

	t := &Int{};
	defer destroy(t);

	if size, err = int_to_bytes_size(v); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b1 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_little(v, b1);
	fmt.printf("little: %v | err: %v\n", b1, err);

	int_from_bytes_little(t, b1);
	if internal_cmp_mag(t, v) != 0 {
		print("\tError parsing t: ", t);
	}

	if size, err = int_to_bytes_size(v); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b2 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_little_python(v, b2);
	fmt.printf("little python: %v | err: %v\n", b2, err);

	if err == nil {
		int_from_bytes_little_python(t, b2);
		if internal_cmp_mag(t, v) != 0 {
			print("\tError parsing t: ", t);
		}
	}

	if size, err = int_to_bytes_size(v, true); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b3 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_little(v, b3, true);
	fmt.printf("little signed: %v | err: %v\n", b3, err);

	int_from_bytes_little(t, b3, true);
	if internal_cmp(t, v) != 0 {
		print("\tError parsing t: ", t);
	}

	if size, err = int_to_bytes_size(v, true); err != nil {
		fmt.printf("int_to_bytes_size returned: %v\n", err);
		return;
	}
	b4 := make([]u8, size, context.temp_allocator);
	err = int_to_bytes_little_python(v, b4, true);
	fmt.printf("little signed python: %v | err: %v\n", b4, err);

	int_from_bytes_little_python(t, b4, true);
	if internal_cmp(t, v) != 0 {
		print("\tError parsing t: ", t);
	}
}

// printf :: fmt.printf;

demo :: proc() {
	a, b, c, d, e, f, res := &Int{}, &Int{}, &Int{}, &Int{}, &Int{}, &Int{}, &Int{};
	defer destroy(a, b, c, d, e, f, res);
}

main :: proc() {
	ta := mem.Tracking_Allocator{};
	mem.tracking_allocator_init(&ta, context.allocator);
	context.allocator = mem.tracking_allocator(&ta);

	demo();

	print_configation();

	print_timings();

	if len(ta.allocation_map) > 0 {
		for _, v in ta.allocation_map {
			fmt.printf("Leaked %v bytes @ %v\n", v.size, v.location);
		}
	}
	if len(ta.bad_free_array) > 0 {
		fmt.println("Bad frees:");
		for v in ta.bad_free_array {
			fmt.println(v);
		}
	}
}