rshift.asm
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上传日期:2022-08-06
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- dnl SPARC mpn_rshift -- Shift a number right.
- dnl Copyright 1995, 1996, 2000 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 INPUT PARAMETERS
- C res_ptr %o0
- C src_ptr %o1
- C size %o2
- C cnt %o3
- ASM_START()
- PROLOGUE(mpn_rshift)
- ld [%o1],%g2 C load first limb
- sub %g0,%o3,%o5 C negate shift count
- add %o2,-1,%o2
- andcc %o2,4-1,%g4 C number of limbs in first loop
- sll %g2,%o5,%g1 C compute function result
- be L(0) C if multiple of 4 limbs, skip first loop
- st %g1,[%sp+80]
- sub %o2,%g4,%o2 C adjust count for main loop
- L(loop0):
- ld [%o1+4],%g3
- add %o0,4,%o0
- add %o1,4,%o1
- addcc %g4,-1,%g4
- srl %g2,%o3,%o4
- sll %g3,%o5,%g1
- mov %g3,%g2
- or %o4,%g1,%o4
- bne L(loop0)
- st %o4,[%o0-4]
- L(0): tst %o2
- be L(end)
- nop
- L(loop):
- ld [%o1+4],%g3
- add %o0,16,%o0
- addcc %o2,-4,%o2
- srl %g2,%o3,%o4
- sll %g3,%o5,%g1
- ld [%o1+8],%g2
- srl %g3,%o3,%g4
- or %o4,%g1,%o4
- st %o4,[%o0-16]
- sll %g2,%o5,%g1
- ld [%o1+12],%g3
- srl %g2,%o3,%o4
- or %g4,%g1,%g4
- st %g4,[%o0-12]
- sll %g3,%o5,%g1
- ld [%o1+16],%g2
- srl %g3,%o3,%g4
- or %o4,%g1,%o4
- st %o4,[%o0-8]
- sll %g2,%o5,%g1
- add %o1,16,%o1
- or %g4,%g1,%g4
- bne L(loop)
- st %g4,[%o0-4]
- L(end): srl %g2,%o3,%g2
- st %g2,[%o0-0]
- retl
- ld [%sp+80],%o0
- EPILOGUE(mpn_rshift)