[xen staging] x86/boot: fold two MOVs into an ADD

[patchbot@xxxxxxx]

commit 7451cdf204a1b119f134f8bc370a5ec119909565
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Apr 7 08:37:27 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Apr 7 08:37:27 2022 +0200

    x86/boot: fold two MOVs into an ADD
    
    There's no point going through %ax; the addition can be done directly in
    %di.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
 xen/arch/x86/boot/mem.S | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/xen/arch/x86/boot/mem.S b/xen/arch/x86/boot/mem.S
index a2db7b5d4d..94ffc87d50 100644
--- a/xen/arch/x86/boot/mem.S
+++ b/xen/arch/x86/boot/mem.S
@@ -24,9 +24,7 @@ get_memory_map:
         cmpw    $E820_BIOS_MAX, bootsym(bios_e820nr) # up to this many entries
         jae     .Ldone
 
-        movw    %di,%ax
-        addw    $20,%ax
-        movw    %ax,%di
+        addw    $20,%di
         testl   %ebx,%ebx                       # check to see if
         jnz     1b                              # %ebx is set to EOF
 
--
generated by git-patchbot for /home/xen/git/xen.git#staging