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/* Optimized memcpy implementation for cached memory on PowerPC64/POWER8.
Copyright (C) 2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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 C 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 C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
Returns 'dst'. */
.machine power8
ENTRY_TOCLESS (__memcpy_power8_cached, 5)
CALL_MCOUNT 3
cmpldi cr7,r5,15
bgt cr7,L(ge_16)
andi. r9,r5,0x1
mr r9,r3
beq cr0,1f
lbz r10,0(r4)
addi r9,r3,1
addi r4,r4,1
stb r10,0(r3)
1:
andi. r10,r5,0x2
beq cr0,2f
lhz r10,0(r4)
addi r9,r9,2
addi r4,r4,2
sth r10,-2(r9)
2:
andi. r10,r5,0x4
beq cr0,3f
lwz r10,0(r4)
addi r9,9,4
addi r4,4,4
stw r10,-4(r9)
3:
andi. r10,r5,0x8
beqlr cr0
ld r10,0(r4)
std r10,0(r9)
blr
.align 4
L(ge_16):
cmpldi cr7,r5,32
ble cr7,L(ge_16_le_32)
cmpldi cr7,r5,64
ble cr7,L(gt_32_le_64)
/* Align dst to 16 bytes. */
andi. r9,r3,0xf
mr r12,r3
beq cr0,L(dst_is_align_16)
lxvd2x v0,0,r4
subfic r12,r9,16
subf r5,r12,r5
add r4,r4,r12
add r12,r3,r12
stxvd2x v0,0,r3
L(dst_is_align_16):
cmpldi cr7,r5,127
ble cr7,L(tail_copy)
mr r9,r12
srdi r10,r5,7
li r11,16
li r6,32
li r7,48
mtctr r10
clrrdi r0,r5,7
/* Main loop, copy 128 bytes each time. */
.align 4
L(copy_128):
lxvd2x v10,0,r4
lxvd2x v11,r4,r11
addi r8,r4,64
addi r10,r9,64
lxvd2x v12,r4,r6
lxvd2x v0,r4,r7
addi r4,r4,128
stxvd2x v10,0,r9
stxvd2x v11,r9,r11
stxvd2x v12,r9,r6
stxvd2x v0,r9,r7
addi r9,r9,128
lxvd2x v10,0,r8
lxvd2x v11,r8,r11
lxvd2x v12,r8,r6
lxvd2x v0,r8,r7
stxvd2x v10,0,r10
stxvd2x v11,r10,r11
stxvd2x v12,r10,r6
stxvd2x v0,r10,r7
bdnz L(copy_128)
add r12,r12,r0
rldicl r5,r5,0,57
L(tail_copy):
cmpldi cr7,r5,63
ble cr7,L(tail_le_64)
li r8,16
li r10,32
lxvd2x v10,0,r4
li r9,48
addi r5,r5,-64
lxvd2x v11,r4,r8
lxvd2x v12,r4,r10
lxvd2x v0,r4,r9
addi r4,r4,64
stxvd2x v10,0,r12
stxvd2x v11,r12,r8
stxvd2x v12,r12,r10
stxvd2x v0,r12,9
addi r12,r12,64
L(tail_le_64):
cmpldi cr7,r5,32
bgt cr7,L(tail_gt_32_le_64)
cmpdi cr7,r5,0
beqlr cr7
addi r5,r5,-32
li r9,16
add r8,r4,r5
add r10,r12,r5
lxvd2x v12,r4,r5
lxvd2x v0,r8,r9
stxvd2x v12,r12,r5
stxvd2x v0,r10,r9
blr
.align 4
L(ge_16_le_32):
addi r5,r5,-16
lxvd2x v0,0,r4
lxvd2x v1,r4,r5
stxvd2x v0,0,r3
stxvd2x v1,r3,r5
blr
.align 4
L(gt_32_le_64):
mr r12,r3
.align 4
L(tail_gt_32_le_64):
li r9,16
lxvd2x v0,0,r4
addi r5,r5,-32
lxvd2x v1,r4,r9
add r8,r4,r5
lxvd2x v2,r4,r5
add r10,r12,r5
lxvd2x v3,r8,r9
stxvd2x v0,0,r12
stxvd2x v1,r12,r9
stxvd2x v2,r12,r5
stxvd2x v3,r10,r9
blr
END_GEN_TB (__memcpy_power8_cached,TB_TOCLESS)
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