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Annotation of OpenXM_contrib/gmp/mpn/hppa/sub_n.s, Revision 1.1

1.1     ! maekawa     1: ; HP-PA  __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
        !             2: ; store difference in a third limb vector.
        !             3:
        !             4: ; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
        !             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
        !             9: ; it under the terms of the GNU Library General Public License as published by
        !            10: ; the Free Software Foundation; either version 2 of the License, or (at your
        !            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
        !            15: ; or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: ; License for more details.
        !            17:
        !            18: ; You should have received a copy of the GNU Library General Public License
        !            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
        !            35:        .export         __mpn_sub_n
        !            36: __mpn_sub_n
        !            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