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nvboard
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nvboard: optimize with branch

This commit is contained in:
Zihao Yu 2024-01-04 23:39:04 +08:00
parent adc894c3e1
commit b7a5b39a9b
1 changed files with 4 additions and 3 deletions
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7
src/nvboard.cpp
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@ -3,6 +3,7 @@
#include <vga.h>
#include <uart.h>
#include <stdarg.h>
#include <macro.h>
#define FPS 60
@ -20,16 +21,16 @@ void nvboard_update() {
extern KEYBOARD* kb;
extern bool is_kb_idle;
if (!is_kb_idle) kb->update_state();
if (unlikely(!is_kb_idle)) kb->update_state();
extern UART* uart;
extern int16_t uart_divisor_cnt;
if ((-- uart_divisor_cnt) < 0) uart->check_tx();
if (unlikely((-- uart_divisor_cnt) < 0)) uart->check_tx();
static uint64_t last = 0;
static int cpf = 1; // count per frame
static int cnt = 0;
if ((-- cnt) < 0) {
if (unlikely((-- cnt) < 0)) {
uint64_t now = nvboard_get_time();
uint64_t diff = now - last;
int cpf_new = ((uint64_t)cpf * 1000000) / ((uint64_t)diff * FPS); // adjust cpf