chore: use a more efficient decimal->bcd algorithm
This will not improve perf in any way because this code only gets run one time a second orz
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@ -293,13 +293,13 @@ pub const Clock = struct {
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self.cpu.sched.push(.RealTimeClock, (1 << 24) -| late); // Reschedule
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const now = DateTime.now();
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self.year = bcd(u8, @intCast(u8, now.date.year - 2000));
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self.month = bcd(u5, now.date.month);
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self.day = bcd(u6, now.date.day);
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self.weekday = bcd(u3, (now.date.weekday() + 1) % 7); // API is Monday = 0, Sunday = 6. We want Sunday = 0, Saturday = 6
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self.hour = bcd(u6, now.time.hour);
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self.minute = bcd(u7, now.time.minute);
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self.second = bcd(u7, now.time.second);
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self.year = bcd(@intCast(u8, now.date.year - 2000));
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self.month = @truncate(u5, bcd(now.date.month));
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self.day = @truncate(u6, bcd(now.date.day));
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self.weekday = @truncate(u3, bcd((now.date.weekday() + 1) % 7)); // API is Monday = 0, Sunday = 6. We want Sunday = 0, Saturday = 6
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self.hour = @truncate(u6, bcd(now.time.hour));
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self.minute = @truncate(u7, bcd(now.time.minute));
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self.second = @truncate(u7, bcd(now.time.second));
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}
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fn step(self: *Self, value: Data) u4 {
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@ -449,16 +449,8 @@ pub const Clock = struct {
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}
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};
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fn bcd(comptime T: type, value: u8) T {
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var input = value;
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var ret: u8 = 0;
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var shift: u3 = 0;
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while (input > 0) {
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ret |= (input % 10) << (shift << 2);
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shift += 1;
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input /= 10;
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}
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return @truncate(T, ret);
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/// Converts an 8-bit unsigned integer to its BCD representation.
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/// Note: Algorithm only works for values between 0 and 99 inclusive.
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fn bcd(value: u8) u8 {
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return ((value / 10) << 4) + (value % 10);
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}
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@ -93,7 +93,7 @@ pub fn main() void {
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gui.run(&cpu, &scheduler) catch |e| exitln("failed to run gui thread: {}", .{e});
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}
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pub fn handleArguments(allocator: Allocator, data_path: []const u8, result: *const clap.Result(clap.Help, ¶ms, clap.parsers.default)) !FilePaths {
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fn handleArguments(allocator: Allocator, data_path: []const u8, result: *const clap.Result(clap.Help, ¶ms, clap.parsers.default)) !FilePaths {
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const rom_path = romPath(result);
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log.info("ROM path: {s}", .{rom_path});
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