1996-03-01 18:45:35 +00:00
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! SPARC v9 __mpn_rshift --
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! Copyright (C) 1996 Free Software Foundation, Inc.
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! This file is part of the GNU MP Library.
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! The GNU MP Library is free software; you can redistribute it and/or modify
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! it under the terms of the GNU Library General Public License as published by
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! the Free Software Foundation; either version 2 of the License, or (at your
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! option) any later version.
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! The GNU MP Library is distributed in the hope that it will be useful, but
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! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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! License for more details.
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! You should have received a copy of the GNU Library General Public License
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! along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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1996-05-07 21:04:52 +00:00
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! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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! MA 02111-1307, USA.
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1996-03-01 18:45:35 +00:00
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! INPUT PARAMETERS
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! res_ptr %o0
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! src_ptr %o1
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! size %o2
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! cnt %o3
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.section ".text"
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.align 4
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.global __mpn_rshift
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.type __mpn_rshift,#function
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.proc 04
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__mpn_rshift:
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ldx [%o1],%g2 ! load first limb
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sub %g0,%o3,%o5 ! negate shift count
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add %o2,-1,%o2
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and %o2,4-1,%g4 ! number of limbs in first loop
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sllx %g2,%o5,%g1 ! compute function result
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brz,pn %g4,.L0 ! if multiple of 4 limbs, skip first loop
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stx %g1,[%sp+80]
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sub %o2,%g4,%o2 ! adjust count for main loop
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.Loop0: ldx [%o1+8],%g3
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add %o0,8,%o0
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add %o1,8,%o1
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add %g4,-1,%g4
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srlx %g2,%o3,%o4
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sllx %g3,%o5,%g1
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mov %g3,%g2
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or %o4,%g1,%o4
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brnz,pt %g4,.Loop0
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stx %o4,[%o0-8]
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.L0: brz,pn %o2,.Lend
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nop
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.Loop: ldx [%o1+8],%g3
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add %o0,32,%o0
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add %o2,-4,%o2
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srlx %g2,%o3,%o4
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sllx %g3,%o5,%g1
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ldx [%o1+16],%g2
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srlx %g3,%o3,%g4
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or %o4,%g1,%o4
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stx %o4,[%o0-32]
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sllx %g2,%o5,%g1
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ldx [%o1+24],%g3
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srlx %g2,%o3,%o4
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or %g4,%g1,%g4
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stx %g4,[%o0-24]
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sllx %g3,%o5,%g1
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ldx [%o1+32],%g2
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srlx %g3,%o3,%g4
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or %o4,%g1,%o4
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stx %o4,[%o0-16]
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sllx %g2,%o5,%g1
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add %o1,32,%o1
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or %g4,%g1,%g4
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brnz %o2,.Loop
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stx %g4,[%o0-8]
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.Lend: srlx %g2,%o3,%g2
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stx %g2,[%o0-0]
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retl
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ldx [%sp+80],%o0
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.LLfe1:
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.size __mpn_rshift,.LLfe1-__mpn_rshift
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