update from main archive 960910

Wed Sep 11 02:57:31 1996  Ulrich Drepper  <drepper@cygnus.com>

	* configure.in: Quote $add_ons argument in loop to generated
	prefices.

Tue Sep 10 20:43:45 1996  Ulrich Drepper  <drepper@cygnus.com>

	* db/makedb.c: Include <locale.h>.  Reported by Fila Kolodny.

Tue Sep 10 13:49:08 1996  Ulrich Drepper  <drepper@cygnus.com>

	* inet/herrno.c: Initialize `h_errno' so that we can provide
	alias.

	* Makefile (version-info.h): Fix typo in shell script.

	* sysdeps/i386/i586/strlen.S: Optimize startup code a bit.
	* sysdeps/i386/i586/strchr.S: Likewise.

2 files changed, 19 insertions, 23 deletions

diff --git a/sysdeps/i386/i586/strchr.S b/sysdeps/i386/i586/strchr.S
index 30de6b069d..100cbbc706 100644
--- a/sysdeps/i386/i586/strchr.S
+++ b/sysdeps/i386/i586/strchr.S
@@ -1,6 +1,6 @@
 /* strchr -- find character CH in a NUL terminated string.
 Highly optimized version for ix85, x>=5.
-Copyright (C) 1995 Free Software Foundation, Inc.
+Copyright (C) 1995, 1996 Free Software Foundation, Inc.
 This file is part of the GNU C Library.
 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
 
@@ -68,9 +68,10 @@ ENTRY (strchr)
 	andl $3, %edi		/* mask alignment bits */
 
 	jz L11			/* alignment is 0 => start loop */
+	jp L0			/* exactly two bits set */
 
 	movb (%eax), %cl	/* load single byte */
-	cmpb %cl, %dl		/* is byte == C? */
+	cmpb (%eax), %dl	/* is byte == C? */
 
 	je L2			/* aligned => return pointer */
 
@@ -78,26 +79,21 @@ ENTRY (strchr)
 	je L3			/* yes => return NULL */
 
 	incl %eax		/* increment pointer */
-	cmp $3, %edi		/* was alignment == 3? */
+	xorl $3, %edi		/* was alignment == 3? */
 
+L0:	movb (%eax), %cl	/* load single byte */
 	je L11			/* yes => start loop */
 
-	movb (%eax), %cl	/* load single byte */
 	cmpb %cl, %dl		/* is byte == C? */
-
 	je L2			/* aligned => return pointer */
 
 	cmpb $0, %cl		/* is byte NUL? */
 	je L3			/* yes => return NULL */
 
+	movb 1(%eax), %cl	/* load single byte */
 	incl %eax		/* increment pointer */
-	cmp $2, %edi		/* was alignment == 2? */
 
-	je L11			/* yes => start loop */
-
-	movb (%eax), %cl	/* load single byte */
 	cmpb %cl, %dl		/* is byte == C? */
-
 	je L2			/* aligned => return pointer */
 
 	cmpb $0, %cl		/* is byte NUL? */
diff --git a/sysdeps/i386/i586/strlen.S b/sysdeps/i386/i586/strlen.S
index 15d01947d4..1e17131389 100644
--- a/sysdeps/i386/i586/strlen.S
+++ b/sysdeps/i386/i586/strlen.S
@@ -42,32 +42,31 @@ Boston, MA 02111-1307, USA.  */
 	.text
 ENTRY(strlen)
 	movl 4(%esp), %eax	/* get string pointer */
+	movl $3, %edx		/* load mask (= 3) */
 
-	movl %eax, %ecx		/* duplicate it */
-	andl $3, %ecx		/* mask alignment bits */
+	andl %eax, %edx		/* separate last two bits of address */
 
-	jz L11			/* aligned => start loop */
+	jz L1			/* aligned => start loop */
+	jp L0			/* exactly two bits set */
 
-	cmpb %ch, (%eax)	/* is byte NUL? */
+	cmpb %dh, (%eax)	/* is byte NUL? */
 	je L2			/* yes => return */
 
 	incl %eax		/* increment pointer */
-	cmpl $3, %ecx		/* was alignment = 3? */
+	xorl $3, %edx		/* was alignment = 3? */
 
-	je L11			/* yes => now it is aligned and start loop */
+	jz L1			/* yes => now it is aligned and start loop */
 
-	cmpb %ch, (%eax)	/* is byte NUL? */
+L0:	cmpb %dh, (%eax)	/* is byte NUL? */
 	je L2			/* yes => return */
 
 	incl %eax		/* increment pointer */
-	cmpl $2, %ecx		/* was alignment = 2? */
 
-	je L11			/* yes => now it is aligned and start loop */
-
-	cmpb %ch, (%eax)	/* is byte NUL? */
+	cmpb %dh, (%eax)	/* is byte NUL? */
 	je L2			/* yes => return */
 
 	incl %eax		/* increment pointer */
+	xorl %edx, %edx		/* We need %edx == 0 for later */
 
       /* We exit the loop if adding MAGIC_BITS to LONGWORD fails to
 	 change any of the hole bits of LONGWORD.
@@ -88,8 +87,9 @@ ENTRY(strlen)
 	 into bit 16.  Similarly, there will be a carry into bit
 	 24.  If one of bits 24-31 is set, there will be a carry
 	 into bit 32 (=carry flag), so all of the hole bits will
-	 be changed.  */
-L11:	xorl %edx, %edx		/* We need %edx == 0 for later */
+	 be changed.
+
+	 Note: %edx == 0 in any case here.  */
 
 L1:
 	movl (%eax), %ecx	/* get word (= 4 bytes) in question */