rshift.asm
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:2k
- dnl HP-PA 2.0 mpn_rshift -- Right shift.
- dnl Copyright 1997, 2000, 2002, 2003 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/.
- dnl This runs at 1.5 cycles/limb on PA8000 and 1.0 cycles/limb on PA8500.
- include(`../config.m4')
- dnl INPUT PARAMETERS
- define(`rp',`%r26')
- define(`up',`%r25')
- define(`n',`%r24')
- define(`cnt',`%r23')
- ifdef(`HAVE_ABI_2_0w',
- ` .level 2.0w
- ',` .level 2.0
- ')
- PROLOGUE(mpn_rshift)
- mtsar cnt
- ldd 0(up), %r21
- addib,= -1, n, L(end)
- shrpd %r21, %r0, %sar, %r29 C compute carry out limb
- depw,z n, 31, 3, %r28 C r28 = (size & 7)
- sub %r0, n, %r22
- depw,z %r22, 28, 3, %r22 C r22 = 8 * (-size & 7)
- sub up, %r22, up C offset up
- blr %r28, %r0 C branch into jump table
- sub rp, %r22, rp C offset rp
- b L(0)
- nop
- b L(1)
- copy %r21, %r20
- b L(2)
- nop
- b L(3)
- copy %r21, %r20
- b L(4)
- nop
- b L(5)
- copy %r21, %r20
- b L(6)
- nop
- b L(7)
- copy %r21, %r20
- LDEF(loop)
- LDEF(0) ldd 8(up), %r20
- shrpd %r20, %r21, %sar, %r21
- std %r21, 0(rp)
- LDEF(7) ldd 16(up), %r21
- shrpd %r21, %r20, %sar, %r20
- std %r20, 8(rp)
- LDEF(6) ldd 24(up), %r20
- shrpd %r20, %r21, %sar, %r21
- std %r21, 16(rp)
- LDEF(5) ldd 32(up), %r21
- shrpd %r21, %r20, %sar, %r20
- std %r20, 24(rp)
- LDEF(4) ldd 40(up), %r20
- shrpd %r20, %r21, %sar, %r21
- std %r21, 32(rp)
- LDEF(3) ldd 48(up), %r21
- shrpd %r21, %r20, %sar, %r20
- std %r20, 40(rp)
- LDEF(2) ldd 56(up), %r20
- shrpd %r20, %r21, %sar, %r21
- std %r21, 48(rp)
- LDEF(1) ldd 64(up), %r21
- ldo 64(up), up
- shrpd %r21, %r20, %sar, %r20
- std %r20, 56(rp)
- addib,> -8, n, L(loop)
- ldo 64(rp), rp
- LDEF(end)
- shrpd %r0, %r21, %sar, %r21
- std %r21, 0(rp)
- bve (%r2)
- ifdef(`HAVE_ABI_2_0w',
- ` copy %r29,%r28
- ',` extrd,u %r29, 31, 32, %r28
- ')
- EPILOGUE(mpn_rshift)