-@ ARM mpn_sub -- Subtract two limb vectors of the same length > 0 and store
-@ difference in a third limb vector.
-@ Contributed by Robert Harley.
-
-@ Copyright (C) 1997, 2000 Free Software Foundation, Inc.
-
-@ This file is part of the GNU MP Library.
-
-@ The GNU MP Library is free software; you can redistribute it and/or modify
-@ it under the terms of the GNU Lesser General Public License as published by
-@ the Free Software Foundation; either version 2.1 of the License, or (at your
-@ option) any later version.
-
-@ The GNU MP Library is distributed in the hope that it will be useful, but
-@ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-@ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-@ License for more details.
-
-@ You should have received a copy of the GNU Lesser General Public License
-@ along with the GNU MP Library; see the file COPYING.LIB. If not, write to
-@ the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-@ MA 02111-1307, USA.
-
-#define d r0
-#define a r1
-#define b r2
-#define n r3
-
-#define sl r10
-#define fp r11
-#define ip r12
-#define sp r13
-#define lr r14
-#define pc r15
-
-.text
- .align 0
- .global __gmpn_sub_n
- .type __gmpn_sub_n,%function
-__gmpn_sub_n:
- stmfd sp!, { r8, r9, lr }
- subs ip, ip, ip
- tst n, #1
- beq skip1
- ldr ip, [a], #4
- ldr lr, [b], #4
- subs ip, ip, lr
- str ip, [d], #4
-skip1:
- tst n, #2
- beq skip2
- ldmia a!, { r8, r9 }
- ldmia b!, { ip, lr }
- sbcs r8, r8, ip
- sbcs r9, r9, lr
- stmia d!, { r8, r9 }
-skip2:
- bics n, n, #3
- beq return
- stmfd sp!, { r4, r5, r6, r7 }
-sub_n_loop:
- ldmia a!, { r4, r5, r6, r7 }
- ldmia b!, { r8, r9, ip, lr }
- sbcs r4, r4, r8
- ldr r8, [d] /* Bring stuff into cache. */
- sbcs r5, r5, r9
- sbcs r6, r6, ip
- sbcs r7, r7, lr
- stmia d!, { r4, r5, r6, r7 }
- sub n, n, #4
- teq n, #0
- bne sub_n_loop
- ldmfd sp!, { r4, r5, r6, r7 }
-return:
- sbc r0, r0, r0
- and r0, r0, #1
- ldmfd sp!, { r8, r9, pc }
-end:
- .size __gmpn_sub_n, end - __gmpn_sub_n