286 lines
6.4 KiB
ArmAsm
286 lines
6.4 KiB
ArmAsm
;! HP-PA __udiv_qrnnd division support, used from longlong.h.
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;! This version runs fast on pre-PA7000 CPUs.
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;! Copyright (C) 1993-2022 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. If not, see
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;! <https://www.gnu.org/licenses/>.
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;! INPUT PARAMETERS
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;! rem_ptr gr26
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;! n1 gr25
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;! n0 gr24
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;! d gr23
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;! The code size is a bit excessive. We could merge the last two ds;addc
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;! sequences by simply moving the "bb,< Odd" instruction down. The only
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;! trouble is the FFFFFFFF code that would need some hacking.
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.text
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.export __udiv_qrnnd
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__udiv_qrnnd:
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.proc
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.callinfo frame=0,no_calls
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.entry
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comb,< %r23,%r0,L$largedivisor
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sub %r0,%r23,%r1 ;! clear cy as side-effect
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ds %r0,%r1,%r0
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r24
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ds %r25,%r23,%r25
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addc %r24,%r24,%r28
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ds %r25,%r23,%r25
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comclr,>= %r25,%r0,%r0
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addl %r25,%r23,%r25
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stws %r25,0(%r26)
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bv 0(%r2)
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addc %r28,%r28,%r28
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L$largedivisor:
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extru %r24,31,1,%r20 ;! r20 = n0 & 1
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bb,< %r23,31,L$odd
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extru %r23,30,31,%r22 ;! r22 = d >> 1
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shd %r25,%r24,1,%r24 ;! r24 = new n0
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extru %r25,30,31,%r25 ;! r25 = new n1
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sub %r0,%r22,%r21
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ds %r0,%r21,%r0
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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comclr,>= %r25,%r0,%r0
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addl %r25,%r22,%r25
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sh1addl %r25,%r20,%r25
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stws %r25,0(%r26)
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bv 0(%r2)
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addc %r24,%r24,%r28
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L$odd: addib,sv,n 1,%r22,L$FF.. ;! r22 = (d / 2 + 1)
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shd %r25,%r24,1,%r24 ;! r24 = new n0
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extru %r25,30,31,%r25 ;! r25 = new n1
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sub %r0,%r22,%r21
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ds %r0,%r21,%r0
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r24
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ds %r25,%r22,%r25
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addc %r24,%r24,%r28
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comclr,>= %r25,%r0,%r0
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addl %r25,%r22,%r25
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sh1addl %r25,%r20,%r25
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;! We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25
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add,nuv %r28,%r25,%r25
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addl %r25,%r1,%r25
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addc %r0,%r28,%r28
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sub,<< %r25,%r23,%r0
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addl %r25,%r1,%r25
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stws %r25,0(%r26)
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bv 0(%r2)
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addc %r0,%r28,%r28
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;! This is just a special case of the code above.
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;! We come here when d == 0xFFFFFFFF
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L$FF..: add,uv %r25,%r24,%r24
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sub,<< %r24,%r23,%r0
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ldo 1(%r24),%r24
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stws %r24,0(%r26)
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bv 0(%r2)
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addc %r0,%r25,%r28
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.exit
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.procend
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