1 files changed, 145 insertions, 0 deletions
diff --git a/libc/string/ia64/strcpy.S b/libc/string/ia64/strcpy.S
new file mode 100644
index 000000000..bee5bf7c2
--- /dev/null
+++ b/libc/string/ia64/strcpy.S
@@ -0,0 +1,145 @@
+/* Optimized version of the standard strcpy() function.
+   This file is part of the GNU C Library.
+   Copyright (C) 2000, 2001, 2003 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* Return: dest
+
+   Inputs:
+        in0:    dest
+        in1:    src
+
+   In this form, it assumes little endian mode.  For big endian mode, the
+   the two shifts in .l2 must be inverted:
+
+	shl   	value = r[1], sh1   	// value = w0 << sh1
+	shr.u   tmp = r[0], sh2   	// tmp = w1 >> sh2
+ */
+
+#include <sysdep.h>
+#undef ret
+
+#define saved_lc	r15
+#define saved_pr	r16
+#define thresh		r17
+#define dest		r19
+#define src		r20
+#define len		r21
+#define asrc		r22
+#define tmp		r23
+#define pos		r24
+#define w0		r25
+#define w1		r26
+#define c		r27
+#define sh2		r28
+#define	sh1		r29
+#define loopcnt		r30
+#define	value		r31
+
+ENTRY(strcpy)
+	.prologue
+	alloc 	r2 = ar.pfs, 2, 0, 30, 32
+
+#define MEMLAT 2
+	.rotr	r[MEMLAT + 2]
+	.rotp	p[MEMLAT + 1]
+
+	mov	ret0 = in0		// return value = dest
+	.save pr, saved_pr
+	mov	saved_pr = pr           // save the predicate registers
+	.save ar.lc, saved_lc
+        mov 	saved_lc = ar.lc	// save the loop counter
+	.body
+	sub	tmp = r0, in0 ;;	// tmp = -dest
+	mov 	dest = in0		// dest
+	mov 	src = in1		// src
+	and	loopcnt = 7, tmp ;;	// loopcnt = -dest % 8
+	cmp.eq	p6, p0 = loopcnt, r0
+	adds	loopcnt = -1, loopcnt	// --loopcnt
+(p6)	br.cond.sptk .dest_aligned ;;
+	mov	ar.lc = loopcnt
+.l1:					// copy -dest % 8 bytes
+	ld1	c = [src], 1		// c = *src++
+	;;
+	st1	[dest] = c, 1		// *dest++ = c
+	cmp.eq	p6, p0 = c, r0
+(p6)	br.cond.dpnt .restore_and_exit
+	br.cloop.dptk .l1 ;;
+.dest_aligned:
+	and	sh1 = 7, src 		// sh1 = src % 8
+	mov	ar.lc = -1		// "infinite" loop
+	and	asrc = -8, src ;;	// asrc = src & -OPSIZ  -- align src
+	sub	thresh = 8, sh1
+	mov	pr.rot = 1 << 16	// set rotating predicates
+	cmp.ne	p7, p0 = r0, r0		// clear p7
+	shl	sh1 = sh1, 3 ;;		// sh1 = 8 * (src % 8)
+	sub	sh2 = 64, sh1		// sh2 = 64 - sh1
+	cmp.eq  p6, p0 = sh1, r0 	// is the src aligned?
+(p6)    br.cond.sptk .src_aligned ;;
+	ld8	r[1] = [asrc],8 ;;
+
+	.align	32
+.l2:
+	ld8.s	r[0] = [asrc], 8
+	shr.u	value = r[1], sh1 ;; 	// value = w0 >> sh1
+	czx1.r	pos = value ;;		// do we have an "early" zero
+	cmp.lt	p7, p0 = pos, thresh	// in w0 >> sh1?
+(p7)	br.cond.dpnt .found0
+	chk.s	r[0], .recovery2	// it is safe to do that only
+.back2:					// after the previous test
+	shl	tmp = r[0], sh2  	// tmp = w1 << sh2
+	;;
+	or	value = value, tmp ;;	// value |= tmp
+	czx1.r	pos = value ;;
+	cmp.ne	p7, p0 = 8, pos
+(p7)	br.cond.dpnt .found0
+	st8	[dest] = value, 8	// store val to dest
+	br.ctop.dptk    .l2 ;;
+.src_aligned:
+.l3:
+(p[0])		ld8.s	r[0] = [src], 8
+(p[MEMLAT])	chk.s	r[MEMLAT], .recovery3
+.back3:
+(p[MEMLAT])	mov	value = r[MEMLAT]
+(p[MEMLAT])	czx1.r	pos = r[MEMLAT] ;;
+(p[MEMLAT])	cmp.ne	p7, p0 = 8, pos
+(p7)		br.cond.dpnt .found0
+(p[MEMLAT])	st8	[dest] = r[MEMLAT], 8
+		br.ctop.dptk .l3 ;;
+.found0:
+	mov	ar.lc = pos
+.l4:
+	extr.u	c = value, 0, 8		// c = value & 0xff
+	shr.u	value = value, 8
+	;;
+	st1	[dest] = c, 1
+	br.cloop.dptk	.l4 ;;
+.restore_and_exit:
+	mov 	ar.lc = saved_lc	// restore the loop counter
+	mov	pr = saved_pr, -1	// restore the predicate registers
+	br.ret.sptk.many b0
+.recovery2:
+	add	tmp = -8, asrc ;;
+	ld8	r[0] = [tmp]
+	br.cond.sptk .back2
+.recovery3:
+	add	tmp = -(MEMLAT + 1) * 8, src ;;
+	ld8	r[MEMLAT] = [tmp]
+	br.cond.sptk .back3
+END(strcpy)
+libc_hidden_def (strcpy)