From db98835fea3bcb8a04530e612cca5081e5c2682a Mon Sep 17 00:00:00 2001
From: Samuel Perrouault <samuel.perrouault@gmail.com>
Date: Wed, 26 Mar 2025 16:18:33 +0100
Subject: turn LD [I] into a single memcpy

---
 src/chip8.rs | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/src/chip8.rs b/src/chip8.rs
index a48b86a..b245861 100644
--- a/src/chip8.rs
+++ b/src/chip8.rs
@@ -184,15 +184,13 @@ impl Chip8 {
             0xF000 => match opcode & 0x00FF {
                 0x0055 => {
                     eprintln!("LD [I], V{}", x);
-                    for i in 0..=x {
-                        self.memory[self.i as usize + i] = self.v[i];
-                    }
+                    let i = self.i as usize;
+                    self.memory[i..=i + x].copy_from_slice(&self.v[..=x]);
                 }
                 0x0065 => {
                     eprintln!("LD V{}, [I]", x);
-                    for i in 0..=x {
-                        self.v[i] = self.memory[self.i as usize + i];
-                    }
+                    let i = self.i as usize;
+                    self.v[..=x].copy_from_slice(&self.memory[i..=i + x]);
                 }
                 _ => unknown_opcode(opcode),
             },
-- 
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