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Annotation of OpenXM_contrib/gmp/mpn/sparc64/lshift.asm, Revision 1.1.1.1

1.1       maekawa     1: ! SPARC v9 __gmpn_lshift --
                      2:
                      3: ! Copyright (C) 1996, 2000 Free Software Foundation, Inc.
                      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:
                     22:
                     23: ! INPUT PARAMETERS
                     24: ! res_ptr      %o0
                     25: ! src_ptr      %o1
                     26: ! size         %o2
                     27: ! cnt          %o3
                     28:
                     29: include(`../config.m4')
                     30:
                     31: ASM_START()
                     32:        .register       %g2,#scratch
                     33:        .register       %g3,#scratch
                     34: PROLOGUE(mpn_lshift)
                     35:        sllx    %o2,3,%g1
                     36:        add     %o1,%g1,%o1     ! make %o1 point at end of src
                     37:        ldx     [%o1-8],%g2     ! load first limb
                     38:        sub     %g0,%o3,%o5     ! negate shift count
                     39:        add     %o0,%g1,%o0     ! make %o0 point at end of res
                     40:        add     %o2,-1,%o2
                     41:        and     %o2,4-1,%g4     ! number of limbs in first loop
                     42:        srlx    %g2,%o5,%g1     ! compute function result
                     43:        brz,pn  %g4,L(0)                ! if multiple of 4 limbs, skip first loop
                     44:        mov     %g1,%g5
                     45:
                     46:        sub     %o2,%g4,%o2     ! adjust count for main loop
                     47:
                     48: L(loop0):
                     49:        ldx     [%o1-16],%g3
                     50:        add     %o0,-8,%o0
                     51:        add     %o1,-8,%o1
                     52:        add     %g4,-1,%g4
                     53:        sllx    %g2,%o3,%o4
                     54:        srlx    %g3,%o5,%g1
                     55:        mov     %g3,%g2
                     56:        or      %o4,%g1,%o4
                     57:        brnz,pt %g4,L(loop0)
                     58:         stx    %o4,[%o0+0]
                     59:
                     60: L(0):  brz,pn  %o2,L(end)
                     61:         nop
                     62:
                     63: L(loop1):
                     64:        ldx     [%o1-16],%g3
                     65:        add     %o0,-32,%o0
                     66:        add     %o2,-4,%o2
                     67:        sllx    %g2,%o3,%o4
                     68:        srlx    %g3,%o5,%g1
                     69:
                     70:        ldx     [%o1-24],%g2
                     71:        sllx    %g3,%o3,%g4
                     72:        or      %o4,%g1,%o4
                     73:        stx     %o4,[%o0+24]
                     74:        srlx    %g2,%o5,%g1
                     75:
                     76:        ldx     [%o1-32],%g3
                     77:        sllx    %g2,%o3,%o4
                     78:        or      %g4,%g1,%g4
                     79:        stx     %g4,[%o0+16]
                     80:        srlx    %g3,%o5,%g1
                     81:
                     82:        ldx     [%o1-40],%g2
                     83:        sllx    %g3,%o3,%g4
                     84:        or      %o4,%g1,%o4
                     85:        stx     %o4,[%o0+8]
                     86:        srlx    %g2,%o5,%g1
                     87:
                     88:        add     %o1,-32,%o1
                     89:        or      %g4,%g1,%g4
                     90:        brnz,pt %o2,L(loop1)
                     91:         stx    %g4,[%o0+0]
                     92:
                     93: L(end):        sllx    %g2,%o3,%g2
                     94:        stx     %g2,[%o0-8]
                     95:        retl
                     96:        mov     %g5,%o0
                     97: EPILOGUE(mpn_lshift)