add_n.asm
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- dnl ARM mpn_add_n -- Add two limb vectors of the same length > 0 and store sum
- dnl in a third limb vector.
- dnl Contributed by Robert Harley.
- dnl Copyright 1997, 2000, 2001 Free Software Foundation, Inc.
- dnl This file is part of the GNU MP Library.
- dnl The GNU MP Library is free software; you can redistribute it and/or modify
- dnl it under the terms of the GNU Lesser General Public License as published
- dnl by the Free Software Foundation; either version 3 of the License, or (at
- dnl your option) any later version.
- dnl The GNU MP Library is distributed in the hope that it will be useful, but
- dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- dnl License for more details.
- dnl You should have received a copy of the GNU Lesser General Public License
- dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
- include(`../config.m4')
- C This code runs at 5 cycles/limb.
- define(`rp',`r0')
- define(`up',`r1')
- define(`vp',`r2')
- define(`n',`r3')
- ASM_START()
- PROLOGUE(mpn_add_n)
- stmfd sp!, { r8, r9, lr }
- movs n, n, lsr #1
- bcc L(skip1)
- ldr r12, [up], #4
- ldr lr, [vp], #4
- adds r12, r12, lr
- str r12, [rp], #4
- L(skip1):
- tst n, #1
- beq L(skip2)
- ldmia up!, { r8, r9 }
- ldmia vp!, { r12, lr }
- adcs r8, r8, r12
- adcs r9, r9, lr
- stmia rp!, { r8, r9 }
- L(skip2):
- bics n, n, #1
- beq L(return)
- stmfd sp!, { r4, r5, r6, r7 }
- L(add_n_loop):
- ldmia up!, { r4, r5, r6, r7 }
- ldmia vp!, { r8, r9, r12, lr }
- adcs r4, r4, r8
- ldr r8, [rp, #12] C cache allocate
- adcs r5, r5, r9
- adcs r6, r6, r12
- adcs r7, r7, lr
- stmia rp!, { r4, r5, r6, r7 }
- sub n, n, #2
- teq n, #0
- bne L(add_n_loop)
- ldmfd sp!, { r4, r5, r6, r7 }
- L(return):
- adc r0, n, #0
- ldmfd sp!, { r8, r9, pc }
- EPILOGUE(mpn_add_n)