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| author | sobomax <sobomax@FreeBSD.org> | 2008-12-08 23:45:41 +0000 |
|---|---|---|
| committer | sobomax <sobomax@FreeBSD.org> | 2008-12-08 23:45:41 +0000 |
| commit | 3a6ba7bd638f8ba131164663056adf7be2107c0e (patch) | |
| tree | c68a4a518384499dc3882dfc460775e07eaebf65 | |
| parent | 592295f8b78da95d781c52a28c60daa3d021e3d3 (diff) | |
| download | FreeBSD-src-3a6ba7bd638f8ba131164663056adf7be2107c0e.zip FreeBSD-src-3a6ba7bd638f8ba131164663056adf7be2107c0e.tar.gz | |
Optimiza assembly in the previous r185779, to save whooping 16 bytes.
Submitted by: Christoph Mallon
MFC after: 4 weeks
(including r185779)
| -rw-r--r-- | sys/boot/i386/btx/btxldr/btxldr.S | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/sys/boot/i386/btx/btxldr/btxldr.S b/sys/boot/i386/btx/btxldr/btxldr.S index 58ee9b6..f27d43a 100644 --- a/sys/boot/i386/btx/btxldr/btxldr.S +++ b/sys/boot/i386/btx/btxldr/btxldr.S @@ -67,11 +67,8 @@ * BTX program loader for ELF clients. */ start: cld # String ops inc - leal 0x4(%esp,1),%ebx # First argument - testl $OPT_SET(RBX_MUTE),(%ebx) # check for RBX_MUTE - jz nomute - movb $1,muted -nomute: + testl $OPT_SET(RBX_MUTE), 4(%esp) # Check first argument + setnz muted # for RBX_MUTE, set flag movl $m_logo,%esi # Identify call putstr # ourselves movzwl BDA_MEM,%eax # Get base memory @@ -296,9 +293,8 @@ putstr: lodsb # Load char /* * Output character AL to the console. */ -putchr: testb $1,muted - jz putchr_nm - ret +putchr: testb $1,muted # Check muted + jnz putchr.5 # do a nop putchr_nm: pusha # Save xorl %ecx,%ecx # Zero for loops movb $SCR_MAT,%ah # Mode/attribute @@ -336,7 +332,7 @@ putchr.3: cmpb $SCR_ROW,%dh # Beyond screen? movb $SCR_ROW-1,%dh # Bottom line putchr.4: movw %dx,(%ebx) # Update position popa # Restore - ret # To caller +putchr.5: ret # To caller /* * Convert EAX, AX, or AL to hex, saving the result to [EDI]. */ |
