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Annotation of OpenXM_contrib/gmp/mpn/pa32/hppa1_1/pa7100/rshift.asm, Revision 1.1.1.1

1.1       ohara       1: dnl  HP-PA  mpn_rshift -- Shift a number right.
                      2: dnl  Optimized for the PA7100, where is runs at 3.25 cycles/limb.
                      3:
                      4: dnl  Copyright 1992, 1994, 2000, 2001, 2002 Free Software Foundation, Inc.
                      5:
                      6: dnl  This file is part of the GNU MP Library.
                      7:
                      8: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
                      9: dnl  it under the terms of the GNU Lesser General Public License as published
                     10: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
                     11: dnl  your option) any later version.
                     12:
                     13: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
                     14: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     15: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     16: dnl  License for more details.
                     17:
                     18: dnl  You should have received a copy of the GNU Lesser General Public License
                     19: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     20: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     21: dnl  MA 02111-1307, USA.
                     22:
                     23: include(`../config.m4')
                     24:
                     25: C INPUT PARAMETERS
                     26: C res_ptr      r26
                     27: C s_ptr                r25
                     28: C size         r24
                     29: C cnt          r23
                     30:
                     31: ASM_START()
                     32: PROLOGUE(mpn_rshift)
                     33:        ldws,ma         4(0,%r25),%r22
                     34:        mtsar           %r23
                     35:        addib,=         -1,%r24,L(0004)
                     36:        vshd            %r22,%r0,%r28           C compute carry out limb
                     37:        ldws,ma         4(0,%r25),%r29
                     38:        addib,<=        -5,%r24,L(rest)
                     39:        vshd            %r29,%r22,%r20
                     40:
                     41:        .label  L(loop)
                     42:        ldws,ma         4(0,%r25),%r22
                     43:        stws,ma         %r20,4(0,%r26)
                     44:        vshd            %r22,%r29,%r20
                     45:        ldws,ma         4(0,%r25),%r29
                     46:        stws,ma         %r20,4(0,%r26)
                     47:        vshd            %r29,%r22,%r20
                     48:        ldws,ma         4(0,%r25),%r22
                     49:        stws,ma         %r20,4(0,%r26)
                     50:        vshd            %r22,%r29,%r20
                     51:        ldws,ma         4(0,%r25),%r29
                     52:        stws,ma         %r20,4(0,%r26)
                     53:        addib,>         -4,%r24,L(loop)
                     54:        vshd            %r29,%r22,%r20
                     55:
                     56:        .label  L(rest)
                     57:        addib,=         4,%r24,L(end1)
                     58:        nop
                     59:
                     60:        .label  L(eloop)
                     61:        ldws,ma         4(0,%r25),%r22
                     62:        stws,ma         %r20,4(0,%r26)
                     63:        addib,<=        -1,%r24,L(end2)
                     64:        vshd            %r22,%r29,%r20
                     65:        ldws,ma         4(0,%r25),%r29
                     66:        stws,ma         %r20,4(0,%r26)
                     67:        addib,>         -1,%r24,L(eloop)
                     68:        vshd            %r29,%r22,%r20
                     69:
                     70:        .label  L(end1)
                     71:        stws,ma         %r20,4(0,%r26)
                     72:        vshd            %r0,%r29,%r20
                     73:        bv              0(%r2)
                     74:        stw             %r20,0(0,%r26)
                     75:
                     76:        .label  L(end2)
                     77:        stws,ma         %r20,4(0,%r26)
                     78:
                     79:        .label  L(0004)
                     80:        vshd            %r0,%r22,%r20
                     81:        bv              0(%r2)
                     82:        stw             %r20,0(0,%r26)
                     83: EPILOGUE()