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

1.1     ! maekawa     1: @ ARM mpn_sub -- Subtract two limb vectors of the same length > 0 and store
        !             2: @ difference in a third limb vector.
        !             3: @ Contributed by Robert Harley.
        !             4:
        !             5: @ Copyright (C) 1997, 2000 Free Software Foundation, Inc.
        !             6:
        !             7: @ This file is part of the GNU MP Library.
        !             8:
        !             9: @ The GNU MP Library is free software; you can redistribute it and/or modify
        !            10: @ it under the terms of the GNU Lesser General Public License as published by
        !            11: @ the Free Software Foundation; either version 2.1 of the License, or (at your
        !            12: @ option) any later version.
        !            13:
        !            14: @ The GNU MP Library is distributed in the hope that it will be useful, but
        !            15: @ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            16: @ or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
        !            17: @ License for more details.
        !            18:
        !            19: @ You should have received a copy of the GNU Lesser General Public License
        !            20: @ along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            21: @ the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            22: @ MA 02111-1307, USA.
        !            23:
        !            24: #define d r0
        !            25: #define a r1
        !            26: #define b r2
        !            27: #define n r3
        !            28:
        !            29: #define sl r10
        !            30: #define fp r11
        !            31: #define ip r12
        !            32: #define sp r13
        !            33: #define lr r14
        !            34: #define pc r15
        !            35:
        !            36: .text
        !            37:        .align  0
        !            38:        .global __gmpn_sub_n
        !            39:        .type   __gmpn_sub_n,%function
        !            40: __gmpn_sub_n:
        !            41:        stmfd   sp!, { r8, r9, lr }
        !            42:        subs    ip, ip, ip
        !            43:        tst     n, #1
        !            44:        beq     skip1
        !            45:        ldr     ip, [a], #4
        !            46:        ldr     lr, [b], #4
        !            47:        subs    ip, ip, lr
        !            48:        str     ip, [d], #4
        !            49: skip1:
        !            50:        tst     n, #2
        !            51:        beq     skip2
        !            52:        ldmia   a!, { r8, r9 }
        !            53:        ldmia   b!, { ip, lr }
        !            54:        sbcs    r8, r8, ip
        !            55:        sbcs    r9, r9, lr
        !            56:        stmia   d!, { r8, r9 }
        !            57: skip2:
        !            58:        bics    n, n, #3
        !            59:        beq     return
        !            60:        stmfd   sp!, { r4, r5, r6, r7 }
        !            61: sub_n_loop:
        !            62:        ldmia   a!, { r4, r5, r6, r7 }
        !            63:        ldmia   b!, { r8, r9, ip, lr }
        !            64:        sbcs    r4, r4, r8
        !            65:        ldr     r8, [d] /* Bring stuff into cache. */
        !            66:        sbcs    r5, r5, r9
        !            67:        sbcs    r6, r6, ip
        !            68:        sbcs    r7, r7, lr
        !            69:        stmia   d!, { r4, r5, r6, r7 }
        !            70:        sub     n, n, #4
        !            71:        teq     n, #0
        !            72:        bne     sub_n_loop
        !            73:        ldmfd   sp!, { r4, r5, r6, r7 }
        !            74: return:
        !            75:        sbc     r0, r0, r0
        !            76:        and     r0, r0, #1
        !            77:        ldmfd   sp!, { r8, r9, pc }
        !            78: end:
        !            79:        .size   __gmpn_sub_n, end - __gmpn_sub_n