From 6b424844e901ff3dc9a43913573b824bfcf15927 Mon Sep 17 00:00:00 2001
From: Nathan Frost <41307858+nero@users.noreply.github.com>
Date: Mon, 24 Jun 2019 17:05:57 +0000
Subject: [PATCH] Optimize fix_chs code

---
 boot/chs.inc | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/boot/chs.inc b/boot/chs.inc
index 53c5c4b..1cceb56 100644
--- a/boot/chs.inc
+++ b/boot/chs.inc
@@ -4,10 +4,10 @@ fix_chs:
   jc chs_end ; skip if function does not exist
   inc dh
   mov [cs:fdc.nos], dh
-  mov ax, cx
-  and ax, 0x003F
-  mov [cs:fdc.spt], ax ; no adjustment because sectors are 1-indexed
-  mov ax, cx
+  push cx
+  and cx, 0x003F
+  mov [cs:fdc.spt], cx ; no adjustment because sectors are 1-indexed
+  pop ax
   xchg al, ah
   mov cl,6
   shr ah,cl