patch-2.1.30 linux/arch/sparc64/lib/strlen.S

• Lines: 78
• Date: Thu Mar 20 16:43:32 1997
• Orig file: v2.1.29/linux/arch/sparc64/lib/strlen.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.29/linux/arch/sparc64/lib/strlen.S linux/arch/sparc64/lib/strlen.S
@@ -0,0 +1,77 @@
+/* strlen.S: Sparc64 optimized strlen code
+ * Hand optimized from GNU libc's strlen
+ * Copyright (C) 1991,1996 Free Software Foundation
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#define LO_MAGIC 0x01010101
+#define HI_MAGIC 0x80808080
+
+	.align 4
+	.global strlen
+strlen:
+	mov	%o0, %o1
+	andcc	%o0, 3, %g0
+	be,pt	%icc, 9f
+	 sethi	%hi(HI_MAGIC), %o4
+	ldub	[%o0], %o5
+	brz,pn	%o5, 11f
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	be,pn	%icc, 4f
+	 or	%o4, %lo(HI_MAGIC), %o3
+	ldub	[%o0], %o5
+	brz,pn	%o5, 12f
+	 add	%o0, 1, %o0
+	andcc	%o0, 3, %g0
+	be,pt	%icc, 5f
+	 sethi	%hi(LO_MAGIC), %o4
+	ldub	[%o0], %o5
+	brz,pn	%o5, 13f
+	 add	%o0, 1, %o0
+	ba,pt	%icc, 8f
+	 or	%o4, %lo(LO_MAGIC), %o2
+9:
+	or	%o4, %lo(HI_MAGIC), %o3
+4:
+	sethi	%hi(LO_MAGIC), %o4
+5:
+	or	%o4, %lo(LO_MAGIC), %o2
+8:
+	ld	[%o0], %o5
+2:
+	sub	%o5, %o2, %o4
+	andcc	%o4, %o3, %g0
+	be,pt	%icc, 8b
+	 add	%o0, 4, %o0
+
+	/* Check every byte. */
+	srl	%o5, 24, %g5
+	andcc	%g5, 0xff, %g0
+	be,pn	%icc, 1f
+	 add	%o0, -4, %o4
+	srl	%o5, 16, %g5
+	andcc	%g5, 0xff, %g0
+	be,pn	%icc, 1f
+	 add	%o4, 1, %o4
+	srl	%o5, 8, %g5
+	andcc	%g5, 0xff, %g0
+	be,pn	%icc, 1f
+	 add	%o4, 1, %o4
+	andcc	%o5, 0xff, %g0
+	bne,a,pt %icc, 2b
+	 ld	[%o0], %o5
+	add	%o4, 1, %o4
+1:
+	retl
+	 sub	%o4, %o1, %o0
+11:
+	retl
+	 mov	0, %o0
+12:
+	retl
+	 mov	1, %o0
+13:
+	retl
+	 mov	2, %o0