dnl IA-64 mpn_lshift/mpn_rshift.
dnl Contributed to the GNU project by Torbjorn Granlund.
dnl Copyright 2000-2005 Free Software Foundation, Inc.
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or modify
dnl it under the terms of either:
dnl
dnl * the GNU Lesser General Public License as published by the Free
dnl Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl or
dnl
dnl * the GNU General Public License as published by the Free Software
dnl Foundation; either version 2 of the License, or (at your option) any
dnl later version.
dnl
dnl or both in parallel, as here.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received copies of the GNU General Public License and the
dnl GNU Lesser General Public License along with the GNU MP Library. If not,
dnl see https://www.gnu.org/licenses/.
include(`../config.m4')
C cycles/limb
C Itanium: 2
C Itanium 2: 1
C This code is scheduled deeply since the plain shift instructions shr and shl
C have a latency of 4 (on Itanium) or 3 (on Itanium 2). Poor scheduling of
C these instructions cause a 10 cycle replay trap on Itanium.
C The ld8 scheduling should probably be decreased to make the function smaller.
C Good lfetch will make sure we never stall anyway.
C We should actually issue the first ld8 at cycle 0, and the first BSH/FSH pair
C at cycle 2. Judicious use of predicates could allow us to issue more ld8's
C in the prologue.
C INPUT PARAMETERS
define(`rp', `r32')
define(`up', `r33')
define(`n', `r34')
define(`cnt',`r35')
define(`tnc',`r9')
ifdef(`OPERATION_lshift',`
define(`FSH',`shl')
define(`BSH',`shr.u')
define(`UPD',`-8')
define(`POFF',`-512')
define(`PUPD',`-32')
define(`func',`mpn_lshift')
')
ifdef(`OPERATION_rshift',`
define(`FSH',`shr.u')
define(`BSH',`shl')
define(`UPD',`8')
define(`POFF',`512')
define(`PUPD',`32')
define(`func',`mpn_rshift')
')
MULFUNC_PROLOGUE(mpn_lshift mpn_rshift)
ASM_START()
PROLOGUE(func)
.prologue
.save ar.lc, r2
.body
ifdef(`HAVE_ABI_32',
` addp4 rp = 0, rp C M I
addp4 up = 0, up C M I
sxt4 n = n C M I
nop.m 0
nop.m 0
zxt4 cnt = cnt C I
;;
')
{.mmi; cmp.lt p14, p15 = 4, n C M I
and r14 = 3, n C M I
mov.i r2 = ar.lc C I0
}{.mmi; add r15 = -1, n C M I
sub tnc = 64, cnt C M I
add r16 = -5, n
;;
}{.mmi; cmp.eq p6, p0 = 1, r14 C M I
cmp.eq p7, p0 = 2, r14 C M I
shr.u n = r16, 2 C I0
}{.mmi; cmp.eq p8, p0 = 3, r14 C M I
ifdef(`OPERATION_lshift',
` shladd up = r15, 3, up C M I
shladd rp = r15, 3, rp') C M I
;;
}{.mmi; add r11 = POFF, up C M I
ld8 r10 = [up], UPD C M01
mov.i ar.lc = n C I0
}{.bbb;
(p6) br.dptk .Lb01
(p7) br.dptk .Lb10
(p8) br.dptk .Lb11
;; }
.Lb00: ld8 r19 = [up], UPD
;;
ld8 r16 = [up], UPD
;;
ld8 r17 = [up], UPD
BSH r8 = r10, tnc C function return value
;;
FSH r24 = r10, cnt
BSH r25 = r19, tnc
(p14) br.cond.dptk .grt4
;;
FSH r26 = r19, cnt
BSH r27 = r16, tnc
;;
FSH r20 = r16, cnt
BSH r21 = r17, tnc
;;
or r14 = r25, r24
FSH r22 = r17, cnt
BSH r23 = r10, tnc
br .Lr4
.grt4: ld8 r18 = [up], UPD
FSH r26 = r19, cnt
BSH r27 = r16, tnc
;;
ld8 r19 = [up], UPD
FSH r20 = r16, cnt
BSH r21 = r17, tnc
;;
ld8 r16 = [up], UPD
FSH r22 = r17, cnt
BSH r23 = r18, tnc
;;
or r14 = r25, r24
ld8 r17 = [up], UPD
br.cloop.dpnt .Ltop
br .Lbot
.Lb01:
(p15) BSH r8 = r10, tnc C function return value I
(p15) FSH r22 = r10, cnt C I
(p15) br.cond.dptk .Lr1 C return B
.grt1: ld8 r18 = [up], UPD
;;
ld8 r19 = [up], UPD
BSH r8 = r10, tnc C function return value
;;
ld8 r16 = [up], UPD
FSH r22 = r10, cnt
BSH r23 = r18, tnc
;;
ld8 r17 = [up], UPD
FSH r24 = r18, cnt
BSH r25 = r19, tnc
br.cloop.dpnt .grt5
;;
or r15 = r23, r22
FSH r26 = r19, cnt
BSH r27 = r16, tnc
;;
FSH r20 = r16, cnt
BSH r21 = r17, tnc
br .Lr5
.grt5: ld8 r18 = [up], UPD
FSH r26 = r19, cnt
BSH r27 = r16, tnc
;;
ld8 r19 = [up], UPD
FSH r20 = r16, cnt
BSH r21 = r17, tnc
;;
or r15 = r23, r22
ld8 r16 = [up], UPD
br .LL01
.Lb10: ld8 r17 = [up], UPD
(p14) br.cond.dptk .grt2
BSH r8 = r10, tnc C function return value
;;
FSH r20 = r10, cnt
BSH r21 = r17, tnc
;;
or r14 = r21, r20
FSH r22 = r17, cnt
br .Lr2 C return
.grt2: ld8 r18 = [up], UPD
BSH r8 = r10, tnc C function return value
;;
ld8 r19 = [up], UPD
FSH r20 = r10, cnt
BSH r21 = r17, tnc
;;
ld8 r16 = [up], UPD
FSH r22 = r17, cnt
BSH r23 = r18, tnc
;;
{.mmi; ld8 r17 = [up], UPD
or r14 = r21, r20
FSH r24 = r18, cnt
}{.mib; nop 0
BSH r25 = r19, tnc
br.cloop.dpnt .grt6
;; }
FSH r26 = r19, cnt
BSH r27 = r16, tnc
br .Lr6
.grt6: ld8 r18 = [up], UPD
FSH r26 = r19, cnt
BSH r27 = r16, tnc
;;
ld8 r19 = [up], UPD
br .LL10
.Lb11: ld8 r16 = [up], UPD
;;
ld8 r17 = [up], UPD
BSH r8 = r10, tnc C function return value
(p14) br.cond.dptk .grt3
;;
FSH r26 = r10, cnt
BSH r27 = r16, tnc
;;
FSH r20 = r16, cnt
BSH r21 = r17, tnc
;;
or r15 = r27, r26
FSH r22 = r17, cnt
br .Lr3 C return
.grt3: ld8 r18 = [up], UPD
FSH r26 = r10, cnt
BSH r27 = r16, tnc
;;
ld8 r19 = [up], UPD
FSH r20 = r16, cnt
BSH r21 = r17, tnc
;;
ld8 r16 = [up], UPD
FSH r22 = r17, cnt
BSH r23 = r18, tnc
;;
ld8 r17 = [up], UPD
br.cloop.dpnt .grt7
or r15 = r27, r26
FSH r24 = r18, cnt
BSH r25 = r19, tnc
br .Lr7
.grt7: or r15 = r27, r26
FSH r24 = r18, cnt
BSH r25 = r19, tnc
ld8 r18 = [up], UPD
br .LL11
C *** MAIN LOOP START ***
ALIGN(32)
.Ltop:
{.mmi; st8 [rp] = r14, UPD C M2
or r15 = r27, r26 C M3
FSH r24 = r18, cnt C I0
}{.mmi; ld8 r18 = [up], UPD C M1
lfetch [r11], PUPD
BSH r25 = r19, tnc C I1
;; }
.LL11:
{.mmi; st8 [rp] = r15, UPD
or r14 = r21, r20
FSH r26 = r19, cnt
}{.mmi; ld8 r19 = [up], UPD
nop.m 0
BSH r27 = r16, tnc
;; }
.LL10:
{.mmi; st8 [rp] = r14, UPD
or r15 = r23, r22
FSH r20 = r16, cnt
}{.mmi; ld8 r16 = [up], UPD
nop.m 0
BSH r21 = r17, tnc
;; }
.LL01:
{.mmi; st8 [rp] = r15, UPD
or r14 = r25, r24
FSH r22 = r17, cnt
}{.mib; ld8 r17 = [up], UPD
BSH r23 = r18, tnc
br.cloop.dptk .Ltop
;; }
C *** MAIN LOOP END ***
.Lbot:
{.mmi; st8 [rp] = r14, UPD
or r15 = r27, r26
FSH r24 = r18, cnt
}{.mib; nop 0
BSH r25 = r19, tnc
nop 0
;; }
.Lr7:
{.mmi; st8 [rp] = r15, UPD
or r14 = r21, r20
FSH r26 = r19, cnt
}{.mib; nop 0
BSH r27 = r16, tnc
nop 0
;; }
.Lr6:
{.mmi; st8 [rp] = r14, UPD
or r15 = r23, r22
FSH r20 = r16, cnt
}{.mib; nop 0
BSH r21 = r17, tnc
nop 0
;; }
.Lr5: st8 [rp] = r15, UPD
or r14 = r25, r24
FSH r22 = r17, cnt
;;
.Lr4: st8 [rp] = r14, UPD
or r15 = r27, r26
;;
.Lr3: st8 [rp] = r15, UPD
or r14 = r21, r20
;;
.Lr2: st8 [rp] = r14, UPD
;;
.Lr1: st8 [rp] = r22, UPD C M23
mov ar.lc = r2 C I0
br.ret.sptk.many b0 C B
EPILOGUE(func)
ASM_END()