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Annotation of OpenXM_contrib/gmp/mpn/power/lshift.asm, Revision 1.1.1.1

1.1       ohara       1: dnl  IBM POWER mpn_lshift -- Shift a number left.
                      2:
                      3: dnl  Copyright 1992, 1994, 1999, 2000, 2001 Free Software Foundation, Inc.
                      4:
                      5: dnl  This file is part of the GNU MP Library.
                      6:
                      7: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
                      8: dnl  it under the terms of the GNU Lesser General Public License as published
                      9: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
                     10: dnl  your option) any later version.
                     11:
                     12: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
                     13: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
                     14: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
                     15: dnl  License for more details.
                     16:
                     17: dnl  You should have received a copy of the GNU Lesser General Public License
                     18: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     19: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     20: dnl  MA 02111-1307, USA.
                     21:
                     22:
                     23: dnl  INPUT PARAMETERS
                     24: dnl  res_ptr   r3
                     25: dnl  s_ptr     r4
                     26: dnl  size      r5
                     27: dnl  cnt       r6
                     28:
                     29: include(`../config.m4')
                     30:
                     31: ASM_START()
                     32: PROLOGUE(mpn_lshift)
                     33:        sli     0,5,2
                     34:        cax     9,3,0
                     35:        cax     4,4,0
                     36:        sfi     8,6,32
                     37:        mtctr   5               C put limb count in CTR loop register
                     38:        lu      0,-4(4)         C read most significant limb
                     39:        sre     3,0,8           C compute carry out limb, and init MQ register
                     40:        bdz     Lend2           C if just one limb, skip loop
                     41:        lu      0,-4(4)         C read 2:nd most significant limb
                     42:        sreq    7,0,8           C compute most significant limb of result
                     43:        bdz     Lend            C if just two limb, skip loop
                     44: Loop:  lu      0,-4(4)         C load next lower limb
                     45:        stu     7,-4(9)         C store previous result during read latency
                     46:        sreq    7,0,8           C compute result limb
                     47:        bdn     Loop            C loop back until CTR is zero
                     48: Lend:  stu     7,-4(9)         C store 2:nd least significant limb
                     49: Lend2: sle     7,0,6           C compute least significant limb
                     50:        st      7,-4(9)         C store it
                     51:        br
                     52: EPILOGUE(mpn_lshift)