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[PATCH v2 7/7] x86/boot: fold two MOVs into an ADD
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 15 Sep 2021 15:26:48 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 15 Sep 2021 13:26:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
There's no point going through %ax; the addition can be done directly in
%di.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.
--- 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
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