Module Name: src
Committed By: jakllsch
Date: Wed Dec 29 22:40:46 UTC 2010
Modified Files:
src/sys/arch/i386/stand/lib: bios_disk.S
Log Message:
Utilize movz[bw]l to save a few instrutions and bytes of .text.
To generate a diff of this commit:
cvs rdiff -u -r1.19 -r1.20 src/sys/arch/i386/stand/lib/bios_disk.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/i386/stand/lib/bios_disk.S
diff -u src/sys/arch/i386/stand/lib/bios_disk.S:1.19 src/sys/arch/i386/stand/lib/bios_disk.S:1.20
--- src/sys/arch/i386/stand/lib/bios_disk.S:1.19 Sat Nov 21 11:52:57 2009
+++ src/sys/arch/i386/stand/lib/bios_disk.S Wed Dec 29 22:40:46 2010
@@ -1,4 +1,4 @@
-/* $NetBSD: bios_disk.S,v 1.19 2009/11/21 11:52:57 dsl Exp $ */
+/* $NetBSD: bios_disk.S,v 1.20 2010/12/29 22:40:46 jakllsch Exp $ */
/*
* Ported to boot 386BSD by Julian Elischer ([email protected]) Sept 1992
@@ -82,8 +82,7 @@
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
- xorl %eax, %eax
- movw %bx, %ax # return value in %ax
+ movzwl %bx, %eax # return value in %eax
pop %edi
pop %edx
@@ -146,7 +145,7 @@
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
- andl $0xffff, %eax
+ movzwl %ax, %eax # return value in %eax
pop %edi
pop %esi
@@ -246,8 +245,7 @@
calll _C_LABEL(real_to_prot) # switch back
.code32
- xorl %eax, %eax
- movb %dl, %al # return value in %ax
+ movzbl %dl, %eax # return value in %eax
cmpw $0xaa55, %bx
sete %dl
@@ -304,8 +302,7 @@
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
- xorl %eax, %eax
- movw %bx, %ax # return value in %ax
+ movzwl %bx, %eax # return value in %eax
pop %edi
pop %esi
@@ -346,8 +343,7 @@
calll _C_LABEL(real_to_prot) # back to protected mode
.code32
- xorl %eax, %eax
- movb %bl, %al # return value in %ax
+ movzbl %bl, %eax # return value in %eax
pop %edi
pop %esi
