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-rw-r--r--libc/string/ia64/strcpy.S145
1 files changed, 145 insertions, 0 deletions
diff --git a/libc/string/ia64/strcpy.S b/libc/string/ia64/strcpy.S
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+/* 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)