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Annotation of OpenXM_contrib/gmp/mpn/s390/mul_1.asm, Revision 1.1.1.1

1.1       ohara       1: dnl  S/390 mpn_mul_1 -- Multiply a limb vector with a limb and store the
                      2: dnl  result in a second limb vector.
                      3:
                      4: dnl  Copyright 2001 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: define(`rp',2)
                     26: define(`up',3)
                     27: define(`n',4)
                     28: define(`vlimb',5)
                     29: define(`cylimb',7)
                     30:
                     31: ASM_START()
                     32: PROLOGUE(mpn_mul_1)
                     33:        stm     6,7,24(15)
                     34:        slr     cylimb,cylimb   # clear cylimb
                     35:        ltr     vlimb,vlimb
                     36:        jnl     .Loopp
                     37:
                     38: .Loopn:        l       1,0(up)         # load from u
                     39:        lr      6,1             #
                     40:        mr      0,vlimb         # multiply signed
                     41:        alr     0,6             # add vlimb to phi
                     42:        sra     6,31            # make mask
                     43:        nr      6,vlimb         # 0 or vlimb
                     44:        alr     0,6             # conditionally add vlimb to phi
                     45:        alr     1,cylimb        # add carry limb to plo
                     46:        brc     8+4,+8          # branch if not carry
                     47:        ahi     0,1             # increment phi
                     48:        lr      cylimb,0        # new cylimb
                     49:        st      1,0(rp)         # store
                     50:        la      up,4(,up)
                     51:        la      rp,4(,rp)
                     52:        brct    n,.Loopn
                     53:
                     54:        lr      2,cylimb
                     55:        lm      6,7,24(15)
                     56:        br      14
                     57:
                     58: .Loopp:        l       1,0(up)         # load from u
                     59:        lr      6,1             #
                     60:        mr      0,vlimb         # multiply signed
                     61:        sra     6,31            # make mask
                     62:        nr      6,vlimb         # 0 or vlimb
                     63:        alr     0,6             # conditionally add vlimb to phi
                     64:        alr     1,cylimb        # add carry limb to plo
                     65:        brc     8+4,+8          # branch if not carry
                     66:        ahi     0,1             # increment phi
                     67:        lr      cylimb,0        # new cylimb
                     68:        st      1,0(rp)         # store
                     69:        la      up,4(,up)
                     70:        la      rp,4(,rp)
                     71:        brct    n,.Loopp
                     72:
                     73:        lr      2,cylimb
                     74:        lm      6,7,24(15)
                     75:        br      14
                     76: EPILOGUE(mpn_mul_1)