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dnl PowerPC-64 mpn_rshift -- rp[] = up[] << cnt
dnl Copyright 2003, 2005, 2010, 2013 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 POWER3/PPC630 ?
C POWER4/PPC970 ?
C POWER5 2
C POWER6 3.5 (mysteriously 3.0 for cnt=1)
C TODO
C * Micro-optimise header code
C * Perhaps do 4-way unrolling, for 2.5 c/l on POWER6. The code is 4248
C bytes, 4-way code would become about 50% larger.
C INPUT PARAMETERS
define(`rp_param', `r3')
define(`up', `r4')
define(`n', `r5')
define(`cnt', `r6')
define(`tnc',`r0')
define(`retval',`r3')
define(`rp', `r7')
ASM_START()
PROLOGUE(mpn_rshift,toc)
ifdef(`HAVE_ABI_mode32',`
rldicl n, n, 0,32 C FIXME: avoid this zero extend
')
mflr r12
LEAL( r11, L(e1)) C address of L(e1) label in SHIFT(1)
sldi r10, cnt, 6 C multiply cnt by size of a SHIFT block
add r11, r11, r10 C address of L(oN) for N = cnt
srdi r10, n, 1
mr rp, rp_param
subfic tnc, cnt, 64
rlwinm. r8, n, 0,31,31 C extract bit 0
mtctr r10
beq L(evn)
L(odd): ld r9, 0(up)
cmpdi cr0, n, 1 C n = 1?
beq L(1)
ld r8, 8(up)
addi r11, r11, -84 C L(o1) - L(e1) - 64
mtlr r11
sld r3, r9, tnc C retval
addi up, up, 8
addi rp, rp, 8
blr C branch to L(oN)
L(evn): ld r8, 0(up)
ld r9, 8(up)
addi r11, r11, -64
mtlr r11
sld r3, r8, tnc C retval
addi up, up, 16
blr C branch to L(eN)
L(1): sld r3, r9, tnc C retval
srd r8, r9, cnt
std r8, 0(rp)
mtlr r12
ifdef(`HAVE_ABI_mode32',
` mr r4, r3
srdi r3, r3, 32
')
blr
define(SHIFT,`
L(lo$1):ld r8, 0(up)
std r11, 0(rp)
addi rp, rp, 16
L(o$1): srdi r10, r9, $1
rldimi r10, r8, eval(64-$1), 0
ld r9, 8(up)
addi up, up, 16
std r10, -8(rp)
L(e$1): srdi r11, r8, $1
rldimi r11, r9, eval(64-$1), 0
bdnz L(lo$1)
std r11, 0(rp)
srdi r10, r9, $1
b L(com)
nop
nop
')
ALIGN(64)
forloop(`i',1,63,`SHIFT(i)')
L(com): std r10, 8(rp)
mtlr r12
ifdef(`HAVE_ABI_mode32',
` mr r4, r3
srdi r3, r3, 32
')
blr
EPILOGUE()
ASM_END()
|
