1 files changed, 124 insertions, 0 deletions
diff --git a/sysdeps/ia64/memchr.S b/sysdeps/ia64/memchr.S
new file mode 100644
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+/* Optimized version of the standard memchr() function.
+   This file is part of the GNU C Library.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Dan Pop <Dan.Pop@cern.ch>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Return: the address of the first occurence of chr in str or NULL
+
+   Inputs:
+  	in0:	str
+  	in1:	chr
+  	in2:	byte count
+
+   This implementation assumes little endian mode.  For big endian mode,
+   the instruction czx1.r should be replaced by czx1.l.
+
+   The algorithm is fairly straightforward: search byte by byte until we
+   we get to a word aligned address, then search word by word as much as
+   possible; the remaining few bytes are searched one at a time.
+
+   The word by word search is performed by xor-ing the word with a word
+   containing chr in every byte.  If there is a hit, the result will 
+   contain a zero byte in the corresponding position.  The presence and 
+   position of that zero byte is detected with a czx instruction.
+
+   All the loops in this function could have had the internal branch removed
+   if br.ctop and br.cloop could be predicated :-(.  */
+
+#include <sysdep.h>
+#undef ret
+
+#define	saved_pfs	r14
+#define saved_pr	r15
+#define saved_lc	r16
+#define	chr		r17
+#define len		r18
+#define pos0		r20
+#define val		r21
+#define tmp		r24
+#define chrx8		r25
+#define loopcnt		r30
+
+#define str		in0
+
+ENTRY(memchr)
+	alloc saved_pfs = ar.pfs, 3, 0, 29, 32
+#include "softpipe.h"
+	.rotr	value[MEMLAT+1], addr[MEMLAT+3], aux[2], poschr[2]
+	.rotp	p[MEMLAT+3]
+        mov 	saved_lc = ar.lc 	// save the loop counter
+	mov	saved_pr = pr		// save the predicates
+	mov 	ret0 = str	
+	and 	tmp = 7, str		// tmp = str % 8
+	cmp.ne	p7, p0 = r0, r0		// clear p7
+	extr.u	chr = in1, 0, 8		// chr = (unsigned char) in1
+	mov	len = in2
+	cmp.gtu	p6, p0 = 16, in2	// use a simple loop for short
+(p6)	br.cond.spnt .srchfew ;;	// searches
+	sub	loopcnt = 8, tmp	// loopcnt = 8 - tmp
+	cmp.eq	p6, p0 = tmp, r0
+(p6)	br.cond.sptk	.str_aligned;;
+	sub	len = len, loopcnt
+	adds	loopcnt = -1, loopcnt;;
+	mov	ar.lc = loopcnt
+.l1:
+	ld1	val = [ret0], 1
+	;;
+	cmp.eq	p6, p0 = val, chr
+(p6)	br.cond.spnt	.foundit
+	br.cloop.sptk	.l1 ;;
+.str_aligned:
+	cmp.ne	p6, p0 = r0, r0		// clear p6
+	shr.u	loopcnt = len, 3	// loopcnt = len / 8
+	and 	len = 7, len ;;		// remaining len = len & 7
+	adds	loopcnt = -1, loopcnt
+	mov	ar.ec = MEMLAT + 3
+	mux1	chrx8 = chr, @brcst ;;	// get a word full of chr
+	mov	ar.lc = loopcnt
+	mov	pr.rot = 1 << 16 ;;
+.l2:	
+(p[0])		mov	addr[0] = ret0
+(p[0])		ld8	value[0] = [ret0], 8
+(p[MEMLAT])	xor	aux[0] = value[MEMLAT], chrx8
+(p[MEMLAT+1])	czx1.r	poschr[0] = aux[1]
+(p[MEMLAT+2])	cmp.ne	p7, p0 = 8, poschr[1]
+(p7)		br.cond.dpnt .foundit
+		br.ctop.dptk .l2
+.srchfew:
+	adds	loopcnt = -1, len 	
+	cmp.eq	p6, p0 = len, r0
+(p6)	br.cond.spnt .notfound ;;
+	mov	ar.lc = loopcnt
+.l3:
+	ld1	val = [ret0], 1
+	;;
+	cmp.eq	p6, p0 = val, chr
+(p6)	br.cond.dpnt	.foundit
+	br.cloop.sptk	.l3 ;;	
+.notfound:
+	cmp.ne	p6, p0 = r0, r0	// clear p6 (p7 was already 0 when we got here)
+	mov	ret0 = r0 ;;	// return NULL
+.foundit:
+(p6)	adds	ret0 = -1, ret0 		   // if we got here from l1 or l3
+(p7)	add	ret0 = addr[MEMLAT+2], poschr[1]   // if we got here from l2
+	mov	pr = saved_pr, -1
+	mov	ar.pfs = saved_pfs
+	mov	ar.lc = saved_lc
+	br.ret.sptk.many b0
+
+END(memchr)