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Annotation of OpenXM_contrib/gmp/mpn/powerpc64/rshift.asm, Revision 1.1.1.2

1.1       maekawa     1: # PowerPC-64 mpn_rshift -- Shift a number right.
                      2:
1.1.1.2 ! ohara       3: # Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
1.1       maekawa     4:
                      5: # This file is part of the GNU MP Library.
                      6:
                      7: # The GNU MP Library is free software; you can redistribute it and/or modify
                      8: # it under the terms of the GNU Lesser General Public License as published by
                      9: # the Free Software Foundation; either version 2.1 of the License, or (at your
                     10: # option) any later version.
                     11:
                     12: # The GNU MP Library is distributed in the hope that it will be useful, but
                     13: # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: # License for more details.
                     16:
                     17: # You should have received a copy of the GNU Lesser General Public License
                     18: # along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: # the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: # MA 02111-1307, USA.
                     21:
1.1.1.2 ! ohara      22: include(`../config.m4')
        !            23:
        !            24:
        !            25: # ppc630: 2.25 cycles/limb
        !            26:
1.1       maekawa    27:
                     28: # INPUT PARAMETERS
                     29: # res_ptr      r3
                     30: # s1_ptr       r4
                     31: # size         r5
                     32: # cnt          r6
                     33:
                     34: ASM_START()
                     35: PROLOGUE(mpn_rshift)
                     36:        mtctr   r5              # copy size into CTR
                     37:        addi    r7,r3,-8        # move adjusted res_ptr to free return reg
                     38:        subfic  r8,r6,64
                     39:        ld      r11,0(r4)       # load first s1 limb
                     40:        sld     r3,r11,r8       # compute function return value
                     41:        bdz     .Lend1
                     42:
                     43: .Loop: ldu     r10,8(r4)
                     44:        srd     r9,r11,r6
                     45:        sld     r12,r10,r8
                     46:        or      r9,r9,r12
                     47:        stdu    r9,8(r7)
                     48:        bdz     .Lend2
                     49:        ldu     r11,8(r4)
                     50:        srd     r9,r10,r6
                     51:        sld     r12,r11,r8
                     52:        or      r9,r9,r12
                     53:        stdu    r9,8(r7)
                     54:        bdnz    .Loop
                     55:
                     56: .Lend1:        srd     r0,r11,r6
                     57:        std     r0,8(r7)
                     58:        blr
                     59:
                     60: .Lend2:        srd     r0,r10,r6
                     61:        std     r0,8(r7)
                     62:        blr
                     63: EPILOGUE(mpn_rshift)