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Annotation of OpenXM_contrib/gmp/mpn/arm/sub_n.asm, Revision 1.1

1.1     ! ohara       1: dnl  ARM mpn_sub_n -- Subtract two limb vectors of the same length > 0 and
        !             2: dnl  store difference in a third limb vector.
        !             3: dnl  Contributed by Robert Harley.
        !             4:
        !             5: dnl  Copyright 1997, 2000, 2001 Free Software Foundation, Inc.
        !             6:
        !             7: dnl  This file is part of the GNU MP Library.
        !             8:
        !             9: dnl  The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: dnl  it under the terms of the GNU Lesser General Public License as published
        !            11: dnl  by the Free Software Foundation; either version 2.1 of the License, or (at
        !            12: dnl  your option) any later version.
        !            13:
        !            14: dnl  The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: dnl  License for more details.
        !            18:
        !            19: dnl  You should have received a copy of the GNU Lesser General Public License
        !            20: dnl  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: dnl  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: dnl  MA 02111-1307, USA.
        !            23:
        !            24: include(`../config.m4')
        !            25:
        !            26: C This code runs at 5 cycles/limb.
        !            27:
        !            28: define(`rp',`r0')
        !            29: define(`up',`r1')
        !            30: define(`vp',`r2')
        !            31: define(`n',`r3')
        !            32:
        !            33:
        !            34: ASM_START()
        !            35: PROLOGUE(mpn_sub_n)
        !            36:        stmfd   sp!, { r8, r9, lr }
        !            37:        subs    r12, r12, r12
        !            38:        tst     n, #1
        !            39:        beq     L(skip1)
        !            40:        ldr     r12, [up], #4
        !            41:        ldr     lr, [vp], #4
        !            42:        subs    r12, r12, lr
        !            43:        str     r12, [rp], #4
        !            44: L(skip1):
        !            45:        tst     n, #2
        !            46:        beq     L(skip2)
        !            47:        ldmia   up!, { r8, r9 }
        !            48:        ldmia   vp!, { r12, lr }
        !            49:        sbcs    r8, r8, r12
        !            50:        sbcs    r9, r9, lr
        !            51:        stmia   rp!, { r8, r9 }
        !            52: L(skip2):
        !            53:        bics    n, n, #3
        !            54:        beq     L(return)
        !            55:        stmfd   sp!, { r4, r5, r6, r7 }
        !            56: L(sub_n_loop):
        !            57:        ldmia   up!, { r4, r5, r6, r7 }
        !            58:        ldmia   vp!, { r8, r9, r12, lr }
        !            59:        sbcs    r4, r4, r8
        !            60:        ldr     r8, [rp, #12]                   C cache allocate
        !            61:        sbcs    r5, r5, r9
        !            62:        sbcs    r6, r6, r12
        !            63:        sbcs    r7, r7, lr
        !            64:        stmia   rp!, { r4, r5, r6, r7 }
        !            65:        sub     n, n, #4
        !            66:        teq     n, #0
        !            67:        bne     L(sub_n_loop)
        !            68:        ldmfd   sp!, { r4, r5, r6, r7 }
        !            69: L(return):
        !            70:        sbc     r0, r0, r0
        !            71:        and     r0, r0, #1
        !            72:        ldmfd   sp!, { r8, r9, pc }
        !            73: EPILOGUE(mpn_sub_n)