94 lines
2.0 KiB
NASM
94 lines
2.0 KiB
NASM
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dnl SPARC mpn_rshift -- Shift a number right.
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dnl Copyright 1995, 1996, 2000 Free Software Foundation, Inc.
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dnl This file is part of the GNU MP Library.
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dnl The GNU MP Library is free software; you can redistribute it and/or modify
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dnl it under the terms of the GNU Lesser General Public License as published
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dnl by the Free Software Foundation; either version 2.1 of the License, or (at
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dnl your option) any later version.
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dnl The GNU MP Library is distributed in the hope that it will be useful, but
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dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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dnl License for more details.
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dnl You should have received a copy of the GNU Lesser General Public License
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dnl along with the GNU MP Library; see the file COPYING.LIB. If not, write
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dnl to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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dnl Boston, MA 02110-1301, USA.
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include(`../config.m4')
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C INPUT PARAMETERS
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C res_ptr %o0
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C src_ptr %o1
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C size %o2
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C cnt %o3
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ASM_START()
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PROLOGUE(mpn_rshift)
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ld [%o1],%g2 C load first limb
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sub %g0,%o3,%o5 C negate shift count
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add %o2,-1,%o2
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andcc %o2,4-1,%g4 C number of limbs in first loop
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sll %g2,%o5,%g1 C compute function result
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be L(0) C if multiple of 4 limbs, skip first loop
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st %g1,[%sp+80]
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sub %o2,%g4,%o2 C adjust count for main loop
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L(loop0):
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ld [%o1+4],%g3
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add %o0,4,%o0
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add %o1,4,%o1
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addcc %g4,-1,%g4
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srl %g2,%o3,%o4
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sll %g3,%o5,%g1
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mov %g3,%g2
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or %o4,%g1,%o4
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bne L(loop0)
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st %o4,[%o0-4]
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L(0): tst %o2
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be L(end)
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nop
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L(loop):
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ld [%o1+4],%g3
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add %o0,16,%o0
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addcc %o2,-4,%o2
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srl %g2,%o3,%o4
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sll %g3,%o5,%g1
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ld [%o1+8],%g2
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srl %g3,%o3,%g4
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or %o4,%g1,%o4
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st %o4,[%o0-16]
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sll %g2,%o5,%g1
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ld [%o1+12],%g3
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srl %g2,%o3,%o4
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or %g4,%g1,%g4
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st %g4,[%o0-12]
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sll %g3,%o5,%g1
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ld [%o1+16],%g2
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srl %g3,%o3,%g4
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or %o4,%g1,%o4
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st %o4,[%o0-8]
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sll %g2,%o5,%g1
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add %o1,16,%o1
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or %g4,%g1,%g4
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bne L(loop)
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st %g4,[%o0-4]
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L(end): srl %g2,%o3,%g2
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st %g2,[%o0-0]
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retl
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ld [%sp+80],%o0
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EPILOGUE(mpn_rshift)
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