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Use "testb %cl,%cl" instead of "cmpb $0,%cl". 

This saves three cycles per character, and reduces the size of the
function by eight bytes (the loop is unrolled eight times).
Thanks to davidg for pointing this out.
This commit is contained in:
jtc 1993-10-08 01:25:51 +00:00
parent 909ad08f8c
commit e09d2f42db
4 changed files with 52 additions and 52 deletions
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32
lib/libc/arch/i386/string/strcmp.S
View File

@ -27,12 +27,12 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: strcmp.S,v 1.1 1993/10/07 00:19:32 cgd Exp $
* $Id: strcmp.S,v 1.2 1993/10/08 01:25:51 jtc Exp $
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$Id: strcmp.S,v 1.1 1993/10/07 00:19:32 cgd Exp $"
.asciz "$Id: strcmp.S,v 1.2 1993/10/08 01:25:51 jtc Exp $"
#endif /* LIBC_RCS and not lint */
#include "DEFS.h"
@ -65,56 +65,56 @@ ENTRY(strcmp)
L1: incl %eax
incl %edx
L2: movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl /* null terminator??? */
je L3
cmpb %cl,(%edx) /* chars match??? */
jne L3
incl %eax
incl %edx
movb (%eax),%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
je L1

32
lib/libc/arch/i386/string/strcmp.s
View File

@ -27,12 +27,12 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: strcmp.s,v 1.1 1993/10/07 00:19:32 cgd Exp $
* $Id: strcmp.s,v 1.2 1993/10/08 01:25:51 jtc Exp $
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$Id: strcmp.s,v 1.1 1993/10/07 00:19:32 cgd Exp $"
.asciz "$Id: strcmp.s,v 1.2 1993/10/08 01:25:51 jtc Exp $"
#endif /* LIBC_RCS and not lint */
#include "DEFS.h"
@ -65,56 +65,56 @@ ENTRY(strcmp)
L1: incl %eax
incl %edx
L2: movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl /* null terminator??? */
je L3
cmpb %cl,(%edx) /* chars match??? */
jne L3
incl %eax
incl %edx
movb (%eax),%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
je L3
cmpb %cl,(%edx)
jne L3
incl %eax
incl %edx
movb (%eax),%cl
cmpb $0,%cl
testb %cl,%cl
je L3
cmpb %cl,(%edx)
je L1

20
lib/libc/arch/i386/string/strncmp.S
View File

@ -27,12 +27,12 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: strncmp.S,v 1.1 1993/10/07 00:19:35 cgd Exp $
* $Id: strncmp.S,v 1.2 1993/10/08 01:25:54 jtc Exp $
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$Id: strncmp.S,v 1.1 1993/10/07 00:19:35 cgd Exp $"
.asciz "$Id: strncmp.S,v 1.2 1993/10/08 01:25:54 jtc Exp $"
#endif /* LIBC_RCS and not lint */
#include "DEFS.h"
@ -71,7 +71,7 @@ L1: incl %eax
L2: testl %edx,%edx /* Have we compared n chars yet? */
jle L4 /* Yes, strings are equal */
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -81,7 +81,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -91,7 +91,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -101,7 +101,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -111,7 +111,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -121,7 +121,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -131,7 +131,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -141,7 +141,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
je L1

20
lib/libc/arch/i386/string/strncmp.s
View File

@ -27,12 +27,12 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: strncmp.s,v 1.1 1993/10/07 00:19:35 cgd Exp $
* $Id: strncmp.s,v 1.2 1993/10/08 01:25:54 jtc Exp $
*/
#if defined(LIBC_RCS) && !defined(lint)
.text
.asciz "$Id: strncmp.s,v 1.1 1993/10/07 00:19:35 cgd Exp $"
.asciz "$Id: strncmp.s,v 1.2 1993/10/08 01:25:54 jtc Exp $"
#endif /* LIBC_RCS and not lint */
#include "DEFS.h"
@ -71,7 +71,7 @@ L1: incl %eax
L2: testl %edx,%edx /* Have we compared n chars yet? */
jle L4 /* Yes, strings are equal */
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -81,7 +81,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -91,7 +91,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -101,7 +101,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -111,7 +111,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -121,7 +121,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -131,7 +131,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
jne L3
@ -141,7 +141,7 @@ L2: testl %edx,%edx /* Have we compared n chars yet? */
testl %edx,%edx
jle L4
movb (%eax),%bl
cmpb $0,%bl
testb %bl,%bl
je L3
cmpb %bl,(%ecx)
je L1