mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-30 04:50:08 +00:00
58 lines
1.2 KiB
Plaintext
58 lines
1.2 KiB
Plaintext
//
|
|
// MintermTests.m
|
|
// Clock SignalTests
|
|
//
|
|
// Created by Thomas Harte on 20/09/2021.
|
|
// Copyright © 2021 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#import <XCTest/XCTest.h>
|
|
|
|
#include <cstdint>
|
|
#include "Minterms.hpp"
|
|
|
|
namespace {
|
|
|
|
/// Implements the Amiga minterm algorithm in a bit-by-bit form.
|
|
template <typename IntT> IntT slow_minterm(IntT a, IntT b, IntT c, uint8_t minterm) {
|
|
constexpr int top_shift = sizeof(IntT) * 8 - 1;
|
|
|
|
IntT result = 0;
|
|
for(int i = 0; i < 8*sizeof(IntT); i++) {
|
|
int index = ((c&1) << 0) | ((b&1) << 1) | ((a&1) << 2);
|
|
|
|
result >>= 1;
|
|
result |= ((minterm >> index) & 1) << top_shift;
|
|
|
|
a >>= 1;
|
|
b >>= 1;
|
|
c >>= 1;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
}
|
|
|
|
@interface MintermTests: XCTestCase
|
|
@end
|
|
|
|
@implementation MintermTests
|
|
|
|
- (void)testAll {
|
|
// These three are selected just to ensure that all combinations of
|
|
// bit pattern exist in the input.
|
|
constexpr uint8_t a = 0xaa;
|
|
constexpr uint8_t b = 0xcc;
|
|
constexpr uint8_t c = 0xf0;
|
|
|
|
for(int minterm = 0; minterm < 256; minterm++) {
|
|
const uint8_t slow = slow_minterm(a, b, c, minterm);
|
|
const uint8_t fast = Amiga::apply_minterm(a, b, c, minterm);
|
|
|
|
XCTAssertEqual(slow, fast, "Mismatch found between naive and fast implementations for %02x", minterm);
|
|
}
|
|
}
|
|
|
|
@end
|