arch/x86_64: replaced loop construct with rep movsb

Replaces inefficient loop construct with rep movsb string instruction. Signed-off-by: cqb <cqb@sideways.engineering>
2026-05-18 17:18:28 +08:00 · 2026-02-01 17:46:28 +01:00
parent 3fb776e45c
commit 7b1e9eb8bc
1 changed files with 2 additions and 8 deletions
@@ -54,15 +54,9 @@ _start:
    movl                $realmode_start, %esi
    movl                $0, %edi

-copy_loop:
-
    /* Copy by bytes, make sure the addresses are not overlapped */
-
-    movb                (%esi), %al
-    movb                %al, (%edi)
-    inc                 %esi
-    inc                 %edi
-    loop                copy_loop
+    cld
+    rep movsb

    /* Jump to bin_start + 0x30, skip the multiboot1 header */