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# PowerPC-64 mpn_lshift -- Shift a number left.
# Copyright (C) 1999, 2000 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; see the file COPYING.LIB. If not, write to
# the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
# MA 02111-1307, USA.
# INPUT PARAMETERS
# res_ptr r3
# s1_ptr r4
# size r5
# cnt r6
include(`../config.m4')
ASM_START()
PROLOGUE(mpn_lshift)
cmpdi cr0,r5,20 # more than 20 limbs?
sldi r0,r5,3
add r4,r4,r0 # make r4 point at end of s1
add r7,r3,r0 # make r7 point at end of res
bgt .LBIG # branch if more than 12 limbs
mtctr r5 # copy size into CTR
subfic r8,r6,64
ldu r11,-8(r4) # load first s1 limb
srd r3,r11,r8 # compute function return value
bdz .Lend1
.Loop: ldu r10,-8(r4)
sld r9,r11,r6
srd r12,r10,r8
or r9,r9,r12
stdu r9,-8(r7)
bdz .Lend2
ldu r11,-8(r4)
sld r9,r10,r6
srd r12,r11,r8
or r9,r9,r12
stdu r9,-8(r7)
bdnz .Loop
.Lend1: sld r0,r11,r6
std r0,-8(r7)
blr
.Lend2: sld r0,r10,r6
std r0,-8(r7)
blr
.LBIG:
std r24,-64(1)
std r25,-56(1)
std r26,-48(1)
std r27,-40(1)
std r28,-32(1)
std r29,-24(1)
std r30,-16(1)
std r31,-8(1)
ldu r9,-8(r4)
subfic r8,r6,64
srd r3,r9,r8 # compute function return value
sld r0,r9,r6
addi r5,r5,-1
andi. r10,r5,3 # count for spill loop
beq .Le
mtctr r10
ldu r28,-8(r4)
bdz .Lxe0
.Loop0: sld r12,r28,r6
srd r24,r28,r8
ldu r28,-8(r4)
or r24,r0,r24
stdu r24,-8(r7)
mr r0,r12
bdnz .Loop0 # taken at most once!
.Lxe0: sld r12,r28,r6
srd r24,r28,r8
or r24,r0,r24
stdu r24,-8(r7)
mr r0,r12
.Le: srdi r5,r5,2 # count for unrolled loop
addi r5,r5,-1
mtctr r5
ld r28,-8(r4)
ld r29,-16(r4)
ld r30,-24(r4)
ldu r31,-32(r4)
.LoopU: sld r9,r28,r6
srd r24,r28,r8
ld r28,-8(r4)
sld r10,r29,r6
srd r25,r29,r8
ld r29,-16(r4)
sld r11,r30,r6
srd r26,r30,r8
ld r30,-24(r4)
sld r12,r31,r6
srd r27,r31,r8
ldu r31,-32(r4)
or r24,r0,r24
std r24,-8(r7)
or r25,r9,r25
std r25,-16(r7)
or r26,r10,r26
std r26,-24(r7)
or r27,r11,r27
stdu r27,-32(r7)
mr r0,r12
bdnz .LoopU
sld r9,r28,r6
srd r24,r28,r8
sld r10,r29,r6
srd r25,r29,r8
sld r11,r30,r6
srd r26,r30,r8
sld r12,r31,r6
srd r27,r31,r8
or r24,r0,r24
std r24,-8(r7)
or r25,r9,r25
std r25,-16(r7)
or r26,r10,r26
std r26,-24(r7)
or r27,r11,r27
stdu r27,-32(r7)
mr r0,r12
std r0,-8(r7)
ld r24,-64(1)
ld r25,-56(1)
ld r26,-48(1)
ld r27,-40(1)
ld r28,-32(1)
ld r29,-24(1)
ld r30,-16(1)
ld r31,-8(1)
blr
EPILOGUE(mpn_lshift)
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