mirror of git://sourceware.org/git/glibc.git
83 lines
2.5 KiB
ArmAsm
83 lines
2.5 KiB
ArmAsm
/* SPARC v9 __mpn_submul_1 -- Multiply a limb vector with a single limb and
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subtract the product from a second limb vector.
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Copyright (C) 1996-2020 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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 Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not,
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see <https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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/* INPUT PARAMETERS
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res_ptr o0
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s1_ptr o1
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size o2
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s2_limb o3 */
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ENTRY(__mpn_submul_1)
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save %sp,-192,%sp
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sub %g0,%i2,%o7
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mov 0,%o0 ! zero cy_limb
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sllx %o7,3,%o7
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sethi %hi(0x80000000),%o2
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srl %i3,0,%o1 ! extract low 32 bits of s2_limb
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sub %i1,%o7,%o3
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srlx %i3,32,%i3 ! extract high 32 bits of s2_limb
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sub %i0,%o7,%o4
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add %o2,%o2,%o2 ! o2 = 0x100000000
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! hi !
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! mid-1 !
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! mid-2 !
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! lo !
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1:
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ldx [%o3+%o7],%g5
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srl %g5,0,%i0 ! zero hi bits
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ldx [%o4+%o7],%l1
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srlx %g5,32,%g5
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mulx %o1,%i0,%i4 ! lo product
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mulx %i3,%i0,%i1 ! mid-1 product
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mulx %o1,%g5,%l2 ! mid-2 product
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mulx %i3,%g5,%i5 ! hi product
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srlx %i4,32,%i0 ! extract high 32 bits of lo product...
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add %i1,%i0,%i1 ! ...and add it to the mid-1 product
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addcc %i1,%l2,%i1 ! add mid products
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mov 0,%l0 ! we need the carry from that add...
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movcs %xcc,%o2,%l0 ! ...compute it and...
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sllx %i1,32,%i0 ! align low bits of mid product
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add %i5,%l0,%i5 ! ...add to bit 32 of the hi product
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srl %i4,0,%g5 ! zero high 32 bits of lo product
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add %i0,%g5,%i0 ! combine into low 64 bits of result
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srlx %i1,32,%i1 ! extract high bits of mid product...
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addcc %i0,%o0,%i0 ! add cy_limb to low 64 bits of result
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add %i5,%i1,%i1 ! ...and add them to the high result
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mov 0,%g5
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movcs %xcc,1,%g5
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subcc %l1,%i0,%i0
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stx %i0,[%o4+%o7]
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add %g5,1,%l1
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movcs %xcc,%l1,%g5
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addcc %o7,8,%o7
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bne,pt %xcc,1b
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add %i1,%g5,%o0 ! compute new cy_limb
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jmpl %i7+8, %g0
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restore %o0,%g0,%o0
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END(__mpn_submul_1)
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