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Annotation of OpenXM_contrib/gmp/mpn/arm/addmul_1.asm, Revision 1.1

1.1     ! ohara       1: dnl  ARM mpn_addmul_1 -- Multiply a limb vector with a limb and add the result
        !             2: dnl  to a second limb vector.
        !             3: dnl  Contributed by Robert Harley.
        !             4:
        !             5: dnl  Copyright 1998, 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 runs at 10 cycles/limb in the StrongARM.  Should make this look more
        !            27: C like the submul code, since that uses fewer registers and runs slightly
        !            28: C faster.
        !            29:
        !            30: define(`rp',`r0')
        !            31: define(`up',`r1')
        !            32: define(`n',`r2')
        !            33: define(`v',`r3')
        !            34:
        !            35:
        !            36: ASM_START()
        !            37: PROLOGUE(mpn_addmul_1)
        !            38:        stmfd   sp!, { r8-r11, lr }
        !            39:        mov     r11, #0
        !            40:        mov     ip, #0
        !            41:        movs    n, n, lsr #1
        !            42:        bcc     L(skip1)
        !            43:        ldr     lr, [up], #4
        !            44:        ldr     r9, [rp]
        !            45:        umlal   r9, ip, v, lr
        !            46:        str     r9, [rp], #4
        !            47: L(skip1):
        !            48:        movs    n, n, lsr #1
        !            49:        bcc     L(skip2)
        !            50:        ldmia   rp, { r9, r10 }
        !            51:        adds    r8, ip, r9
        !            52:        adc     r9, r11, #0
        !            53:        ldmia   up!, { ip, lr }
        !            54:        umlal   r8, r9, v, ip
        !            55:        adds    r9, r9, r10
        !            56:        adc     ip, r11, #0
        !            57:        umlal   r9, ip, v, lr
        !            58:        stmia   rp!, { r8, r9 }
        !            59: L(skip2):
        !            60:        teq     n, #0
        !            61:        beq     L(return)
        !            62:        stmfd   sp!, { r4-r7 }
        !            63: L(addmul_loop):
        !            64:        ldmia   rp, { r5, r6, r7, r8 }
        !            65:        adds    r4, ip, r5
        !            66:        adc     r5, r11, #0
        !            67:        ldmia   up!, { r9, r10, ip, lr }
        !            68:        umlal   r4, r5, v, r9
        !            69:        adds    r5, r5, r6
        !            70:        adc     r6, r11, #0
        !            71:        umlal   r5, r6, v, r10
        !            72:        adds    r6, r6, r7
        !            73:        adc     r7, r11, #0
        !            74:        umlal   r6, r7, v, ip
        !            75:        adds    r7, r7, r8
        !            76:        adc     ip, r11, #0
        !            77:        umlal   r7, ip, v, lr
        !            78:        subs    n, n, #1
        !            79:        stmia   rp!, { r4, r5, r6, r7 }
        !            80:        bne     L(addmul_loop)
        !            81:        ldmfd   sp!, { r4-r7 }
        !            82: L(return):
        !            83:        mov     r0, ip
        !            84:        ldmfd   sp!, { r8-r11, pc }
        !            85: EPILOGUE(mpn_addmul_1)