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Annotation of OpenXM_contrib/gmp/mpn/hppa/sub_n.s, Revision 1.1.1.2

1.1.1.2 ! maekawa     1: ; HP-PA  __gmpn_sub_n -- Subtract two limb vectors of the same length > 0 and
1.1       maekawa     2: ; store difference in a third limb vector.
                      3:
1.1.1.2 ! maekawa     4: ; Copyright (C) 1992, 1994, 2000 Free Software Foundation, Inc.
1.1       maekawa     5:
                      6: ; This file is part of the GNU MP Library.
                      7:
                      8: ; The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 ! maekawa     9: ; it under the terms of the GNU Lesser General Public License as published by
        !            10: ; the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    11: ; option) any later version.
                     12:
                     13: ; The GNU MP Library is distributed in the hope that it will be useful, but
                     14: ; WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 ! maekawa    15: ; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: ; License for more details.
                     17:
1.1.1.2 ! maekawa    18: ; You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    19: ; along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: ; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: ; MA 02111-1307, USA.
                     22:
                     23:
                     24: ; INPUT PARAMETERS
                     25: ; res_ptr      gr26
                     26: ; s1_ptr       gr25
                     27: ; s2_ptr       gr24
                     28: ; size         gr23
                     29:
                     30: ; One might want to unroll this as for other processors, but it turns
                     31: ; out that the data cache contention after a store makes such
                     32: ; unrolling useless.  We can't come under 5 cycles/limb anyway.
                     33:
                     34:        .code
1.1.1.2 ! maekawa    35:        .export         __gmpn_sub_n
        !            36: __gmpn_sub_n
1.1       maekawa    37:        .proc
                     38:        .callinfo       frame=0,no_calls
                     39:        .entry
                     40:
                     41:        ldws,ma         4(0,%r25),%r20
                     42:        ldws,ma         4(0,%r24),%r19
                     43:
                     44:        addib,=         -1,%r23,L$end   ; check for (SIZE == 1)
                     45:         sub            %r20,%r19,%r28  ; subtract first limbs ignoring cy
                     46:
                     47: L$loop ldws,ma         4(0,%r25),%r20
                     48:        ldws,ma         4(0,%r24),%r19
                     49:        stws,ma         %r28,4(0,%r26)
                     50:        addib,<>        -1,%r23,L$loop
                     51:         subb           %r20,%r19,%r28
                     52:
                     53: L$end  stws            %r28,0(0,%r26)
                     54:        addc            %r0,%r0,%r28
                     55:        bv              0(%r2)
                     56:         subi           1,%r28,%r28
                     57:
                     58:        .exit
                     59:        .procend