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Diffstat (limited to 'sysdeps/ia64/strcpy.S')
| -rw-r--r-- | sysdeps/ia64/strcpy.S | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/sysdeps/ia64/strcpy.S b/sysdeps/ia64/strcpy.S new file mode 100644 index 0000000000..1250edec70 --- /dev/null +++ b/sysdeps/ia64/strcpy.S @@ -0,0 +1,142 @@ +/* Optimized version of the standard strcpy() 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: 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_pfs r14 +#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) + alloc saved_pfs = ar.pfs, 2, 0, 30, 32 + +#define MEMLAT 2 + .rotr r[MEMLAT + 2] + .rotp p[MEMLAT + 1] + + mov ret0 = in0 // return value = dest + mov saved_pr = pr // save the predicate registers + mov saved_lc = ar.lc // save the loop counter + 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.pfs = saved_pfs // restore the PFS + 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[MEMLAT] = [tmp] + br.cond.sptk .back2 +.recovery3: + add tmp = -(MEMLAT + 1) * 8, src ;; + ld8 r[MEMLAT] = [tmp] + br.cond.sptk .back3 +END(strcpy) |