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@ 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 Library General Public License as published by
@ the Free Software Foundation; either version 2 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 Library General Public
@ License for more details.
@ You should have received a copy of the GNU Library 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
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