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glibc/sysdeps/hppa/udiv_qrnnd.S

286 lines
6.4 KiB
ArmAsm
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;! HP-PA __udiv_qrnnd division support, used from longlong.h.
;! This version runs fast on pre-PA7000 CPUs.
;! Copyright (C) 1993-2024 Free Software Foundation, Inc.
;! This file is part of the GNU MP Library.
;! The GNU MP Library is free software; you can redistribute it and/or modify
;! it under the terms of the GNU Lesser General Public License as published by
;! the Free Software Foundation; either version 2.1 of the License, or (at your
;! option) any later version.
;! The GNU MP Library is distributed in the hope that it will be useful, but
;! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
;! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
;! License for more details.
;! You should have received a copy of the GNU Lesser General Public License
;! along with the GNU MP Library. If not, see
;! <https://www.gnu.org/licenses/>.
;! INPUT PARAMETERS
;! rem_ptr gr26
;! n1 gr25
;! n0 gr24
;! d gr23
;! The code size is a bit excessive. We could merge the last two ds;addc
;! sequences by simply moving the "bb,< Odd" instruction down. The only
;! trouble is the FFFFFFFF code that would need some hacking.
.text
.export __udiv_qrnnd
__udiv_qrnnd:
.proc
.callinfo frame=0,no_calls
.entry
comb,< %r23,%r0,L$largedivisor
sub %r0,%r23,%r1 ;! clear cy as side-effect
ds %r0,%r1,%r0
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r24
ds %r25,%r23,%r25
addc %r24,%r24,%r28
ds %r25,%r23,%r25
comclr,>= %r25,%r0,%r0
addl %r25,%r23,%r25
stws %r25,0(%r26)
bv 0(%r2)
addc %r28,%r28,%r28
L$largedivisor:
extru %r24,31,1,%r20 ;! r20 = n0 & 1
bb,< %r23,31,L$odd
extru %r23,30,31,%r22 ;! r22 = d >> 1
shd %r25,%r24,1,%r24 ;! r24 = new n0
extru %r25,30,31,%r25 ;! r25 = new n1
sub %r0,%r22,%r21
ds %r0,%r21,%r0
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
comclr,>= %r25,%r0,%r0
addl %r25,%r22,%r25
sh1addl %r25,%r20,%r25
stws %r25,0(%r26)
bv 0(%r2)
addc %r24,%r24,%r28
L$odd: addib,sv,n 1,%r22,L$FF.. ;! r22 = (d / 2 + 1)
shd %r25,%r24,1,%r24 ;! r24 = new n0
extru %r25,30,31,%r25 ;! r25 = new n1
sub %r0,%r22,%r21
ds %r0,%r21,%r0
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r24
ds %r25,%r22,%r25
addc %r24,%r24,%r28
comclr,>= %r25,%r0,%r0
addl %r25,%r22,%r25
sh1addl %r25,%r20,%r25
;! We have computed (n1,,n0) / (d + 1), q' = r28, r' = r25
add,nuv %r28,%r25,%r25
addl %r25,%r1,%r25
addc %r0,%r28,%r28
sub,<< %r25,%r23,%r0
addl %r25,%r1,%r25
stws %r25,0(%r26)
bv 0(%r2)
addc %r0,%r28,%r28
;! This is just a special case of the code above.
;! We come here when d == 0xFFFFFFFF
L$FF..: add,uv %r25,%r24,%r24
sub,<< %r24,%r23,%r0
ldo 1(%r24),%r24
stws %r24,0(%r26)
bv 0(%r2)
addc %r0,%r25,%r28
.exit
.procend
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