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// file kernel/n/x86/cmp.S: comparison of natural integers
/*-----------------------------------------------------------------------+
| Copyright 2005-2006, Michel Quercia (michel.quercia@prepas.org) |
| |
| This file is part of Numerix. Numerix 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 Numerix 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 MP Library; see the file COPYING. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - |
| Suite 330, Boston, MA 02111-1307, USA. |
+-----------------------------------------------------------------------+
| |
| Comparaison |
| |
+-----------------------------------------------------------------------*/
# long xn(cmp)(chiffre *a, long la, chiffre *b, long lb)
#
# entre :
# a = naturel de longueur la
# b = naturel de longueur lb
#
# sortie :
## 1 si a > b, 0 si a = b, -1 si a < b
#ifdef assembly_sn_cmp
#undef L
#define L(x) .Lsn_cmp_##x
ENTER(sn_cmp)
movl arg1, %esi # esi <- &a
movl arg2, %edx # edx <- la
movl arg3, %edi # edi <- &b
movl arg4, %ecx # ecx <- lb
# supprime les zros de tte du plus long argument
1:
cmpl %edx, %ecx
je 3f
ja 2f
testl $-1, -4(%esi,%edx,4)
jne L(big)
decl %edx
jmp 1b
2:
testl $-1, -4(%edi,%ecx,4)
jne L(small)
decl %ecx
jmp 1b
3:
# ici, la == lb, compare les chiffres
jecxz L(equal)
4:
movl -4(%esi,%ecx,4), %eax
cmpl -4(%edi,%ecx,4), %eax
ja L(big)
jb L(small)
loop 4b
L(equal):
movl $0, %eax
RETURN_WITH_SP
L(small):
movl $-1, %eax
RETURN_WITH_SP
L(big):
movl $1, %eax
RETURN_WITH_SP
#endif /* assembly_sn_cmp */
|
