rshift.asm
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:3k
- dnl SPARC v9 mpn_rshift
- dnl Copyright 1996, 2000, 2001, 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/.
- include(`../config.m4')
- C cycles/limb
- C UltraSPARC 1&2: 2
- C UltraSPARC 3: 3.25
- C INPUT PARAMETERS
- define(`rp',`%i0')
- define(`up',`%i1')
- define(`n',`%i2')
- define(`cnt',`%i3')
- define(`u0',`%l0')
- define(`u1',`%l2')
- define(`u2',`%l4')
- define(`u3',`%l6')
- define(`tnc',`%i4')
- define(`fanop',`fitod %f0,%f2') dnl A quasi nop running in the FA pipe
- define(`fmnop',`fmuld %f0,%f0,%f4') dnl A quasi nop running in the FM pipe
- ASM_START()
- REGISTER(%g2,#scratch)
- REGISTER(%g3,#scratch)
- PROLOGUE(mpn_rshift)
- save %sp,-160,%sp
- sub %g0,cnt,tnc C negate shift count
- ldx [up],u3 C load first limb
- subcc n,5,n
- sllx u3,tnc,%i5 C compute function result
- srlx u3,cnt,%g3
- bl,pn %icc,.Lend1234
- fanop
- subcc n,4,n
- ldx [up+8],u0
- ldx [up+16],u1
- add up,32,up
- ldx [up-8],u2
- ldx [up+0],u3
- sllx u0,tnc,%g2
- bl,pn %icc,.Lend5678
- fanop
- b,a .Loop
- .align 16
- .Loop:
- srlx u0,cnt,%g1
- or %g3,%g2,%g3
- ldx [up+8],u0
- fanop
- C --
- sllx u1,tnc,%g2
- subcc n,4,n
- stx %g3,[rp+0]
- fanop
- C --
- srlx u1,cnt,%g3
- or %g1,%g2,%g1
- ldx [up+16],u1
- fanop
- C --
- sllx u2,tnc,%g2
- stx %g1,[rp+8]
- add up,32,up
- fanop
- C --
- srlx u2,cnt,%g1
- or %g3,%g2,%g3
- ldx [up-8],u2
- fanop
- C --
- sllx u3,tnc,%g2
- stx %g3,[rp+16]
- add rp,32,rp
- fanop
- C --
- srlx u3,cnt,%g3
- or %g1,%g2,%g1
- ldx [up+0],u3
- fanop
- C --
- sllx u0,tnc,%g2
- stx %g1,[rp-8]
- bge,pt %icc,.Loop
- fanop
- C --
- .Lend5678:
- srlx u0,cnt,%g1
- or %g3,%g2,%g3
- sllx u1,tnc,%g2
- stx %g3,[rp+0]
- srlx u1,cnt,%g3
- or %g1,%g2,%g1
- sllx u2,tnc,%g2
- stx %g1,[rp+8]
- srlx u2,cnt,%g1
- or %g3,%g2,%g3
- sllx u3,tnc,%g2
- stx %g3,[rp+16]
- add rp,32,rp
- srlx u3,cnt,%g3 C carry...
- or %g1,%g2,%g1
- stx %g1,[rp-8]
- .Lend1234:
- addcc n,4,n
- bz,pn %icc,.Lret
- fanop
- .Loop0:
- add rp,8,rp
- subcc n,1,n
- ldx [up+8],u3
- add up,8,up
- sllx u3,tnc,%g2
- or %g3,%g2,%g3
- stx %g3,[rp-8]
- srlx u3,cnt,%g3
- bnz,pt %icc,.Loop0
- fanop
- .Lret:
- stx %g3,[rp+0]
- mov %i5,%i0
- ret
- restore
- EPILOGUE(mpn_rshift)