From 10d0a41196c0d8ac42cbad34d6578153c7441ef4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Magalh=C3=A3es?= <joamag@gmail.com>
Date: Thu, 16 Jun 2022 16:27:00 +0100
Subject: [PATCH] feat: optimization by using inline
---
src/chip8.rs | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/src/chip8.rs b/src/chip8.rs
index b6a6fad..188b186 100644
--- a/src/chip8.rs
+++ b/src/chip8.rs
@@ -216,6 +216,7 @@ impl Chip8 {
}
}
+ #[inline(always)]
fn fetch_opcode(&mut self) -> u16 {
let opcode =
(self.ram[self.pc as usize] as u16) << 8 | self.ram[self.pc as usize + 1] as u16;
@@ -223,48 +224,57 @@ impl Chip8 {
opcode
}
+ #[inline(always)]
fn add(&mut self, x: usize, y: usize) {
let (sum, overflow) = self.registers[x].overflowing_add(self.registers[y]);
self.registers[0xF] = overflow as u8;
self.registers[x] = sum;
}
+ #[inline(always)]
fn sub(&mut self, x: usize, y: usize) -> u8 {
self.registers[0xF] = (self.registers[x] > self.registers[y]) as u8;
self.registers[x].saturating_sub(self.registers[y])
}
-
+
+ #[inline(always)]
fn call_subroutine(&mut self, addr: u16) {
self.stack[self.sp as usize] = self.pc;
self.sp += 1;
self.pc = addr;
}
+ #[inline(always)]
fn return_subroutine(&mut self) {
self.sp -= 1;
self.pc = self.stack[self.sp as usize];
}
+ #[inline(always)]
fn shift_right(&mut self, x: usize) {
self.registers[0xF] = self.registers[x] & 0x01;
self.registers[x] >>= 1;
}
+ #[inline(always)]
fn shift_left(&mut self, x: usize) {
self.registers[0xF] = (self.registers[x] & 0x80) >> 7;
self.registers[x] <<= 1;
}
+ #[inline(always)]
fn store_bcd(&mut self, x: usize) {
self.ram[self.i as usize] = self.registers[x] / 100;
self.ram[self.i as usize + 1] = (self.registers[x] / 10) % 10;
self.ram[self.i as usize + 2] = self.registers[x] % 10;
}
+ #[inline(always)]
fn skip_if(&mut self, skip: bool) {
self.pc += if skip { 2 } else { 0 };
}
+ #[inline(always)]
fn wait_for_key(&mut self, x: usize) {
if self.keys[self.last_key as usize] {
self.registers[x] = self.last_key;
@@ -273,6 +283,7 @@ impl Chip8 {
}
}
+ #[inline(always)]
fn draw_sprite(&mut self, x0: usize, y0: usize, height: usize) {
self.registers[0xF] = 0;
for y in 0..height {
--
GitLab