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Annotation of OpenXM_contrib/gmp/mpn/arm/sub_n.S, Revision 1.1.1.1

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