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Annotation of OpenXM_contrib/gmp/mpn/sparc32/lshift.asm, Revision 1.1

1.1     ! maekawa     1: dnl  SPARC mpn_lshift -- Shift a number left.
        !             2: dnl
        !             3:
        !             4: dnl  Copyright (C) 1995, 1996, 2000 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:
        !            24: include(`../config.m4')
        !            25:
        !            26: C INPUT PARAMETERS
        !            27: C res_ptr      %o0
        !            28: C src_ptr      %o1
        !            29: C size         %o2
        !            30: C cnt          %o3
        !            31:
        !            32: ASM_START()
        !            33: PROLOGUE(mpn_lshift)
        !            34:        sll     %o2,2,%g1
        !            35:        add     %o1,%g1,%o1     C make %o1 point at end of src
        !            36:        ld      [%o1-4],%g2     C load first limb
        !            37:        sub     %g0,%o3,%o5     C negate shift count
        !            38:        add     %o0,%g1,%o0     C make %o0 point at end of res
        !            39:        add     %o2,-1,%o2
        !            40:        andcc   %o2,4-1,%g4     C number of limbs in first loop
        !            41:        srl     %g2,%o5,%g1     C compute function result
        !            42:        be      L(0)            C if multiple of 4 limbs, skip first loop
        !            43:        st      %g1,[%sp+80]
        !            44:
        !            45:        sub     %o2,%g4,%o2     C adjust count for main loop
        !            46:
        !            47: L(loop0):
        !            48:        ld      [%o1-8],%g3
        !            49:        add     %o0,-4,%o0
        !            50:        add     %o1,-4,%o1
        !            51:        addcc   %g4,-1,%g4
        !            52:        sll     %g2,%o3,%o4
        !            53:        srl     %g3,%o5,%g1
        !            54:        mov     %g3,%g2
        !            55:        or      %o4,%g1,%o4
        !            56:        bne     L(loop0)
        !            57:         st     %o4,[%o0+0]
        !            58:
        !            59: L(0):  tst     %o2
        !            60:        be      L(end)
        !            61:         nop
        !            62:
        !            63: L(loop):
        !            64:        ld      [%o1-8],%g3
        !            65:        add     %o0,-16,%o0
        !            66:        addcc   %o2,-4,%o2
        !            67:        sll     %g2,%o3,%o4
        !            68:        srl     %g3,%o5,%g1
        !            69:
        !            70:        ld      [%o1-12],%g2
        !            71:        sll     %g3,%o3,%g4
        !            72:        or      %o4,%g1,%o4
        !            73:        st      %o4,[%o0+12]
        !            74:        srl     %g2,%o5,%g1
        !            75:
        !            76:        ld      [%o1-16],%g3
        !            77:        sll     %g2,%o3,%o4
        !            78:        or      %g4,%g1,%g4
        !            79:        st      %g4,[%o0+8]
        !            80:        srl     %g3,%o5,%g1
        !            81:
        !            82:        ld      [%o1-20],%g2
        !            83:        sll     %g3,%o3,%g4
        !            84:        or      %o4,%g1,%o4
        !            85:        st      %o4,[%o0+4]
        !            86:        srl     %g2,%o5,%g1
        !            87:
        !            88:        add     %o1,-16,%o1
        !            89:        or      %g4,%g1,%g4
        !            90:        bne     L(loop)
        !            91:         st     %g4,[%o0+0]
        !            92:
        !            93: L(end):        sll     %g2,%o3,%g2
        !            94:        st      %g2,[%o0-4]
        !            95:        retl
        !            96:        ld      [%sp+80],%o0
        !            97: EPILOGUE(mpn_lshift)