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/***************************************************************************
Copyright (c) 2009-2013 The Linux Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of The Linux Foundation nor the names of its contributors may
be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***************************************************************************/
/***************************************************************************
* Neon memmove: Attempts to do a memmove with Neon registers if possible,
* Inputs:
* dest: The destination buffer
* src: The source buffer
* n: The size of the buffer to transfer
* Outputs:
*
***************************************************************************/
#include <machine/cpu-features.h>
#include <machine/asm.h>
/*
* These can be overridden in:
* device/<vendor>/<board>/BoardConfig.mk
* by setting the following:
* TARGET_USE_KRAIT_BIONIC_OPTIMIZATION := true
* TARGET_USE_KRAIT_PLD_SET := true
* TARGET_KRAIT_BIONIC_PLDOFFS := <pldoffset>
* TARGET_KRAIT_BIONIC_PLDSIZE := <pldsize>
* TARGET_KRAIT_BIONIC_PLDTHRESH := <pldthreshold>
*/
#ifndef PLDOFFS
#define PLDOFFS (10)
#endif
#ifndef PLDTHRESH
#define PLDTHRESH (PLDOFFS)
#endif
#if (PLDOFFS < 5)
#error Routine does not support offsets less than 5
#endif
#if (PLDTHRESH < PLDOFFS)
#error PLD threshold must be greater than or equal to the PLD offset
#endif
#ifndef PLDSIZE
#define PLDSIZE (64)
#endif
.text
.syntax unified
.fpu neon
.thumb
.thumb_func
ENTRY(bcopy)
.cfi_startproc
mov r12, r0
mov r0, r1
mov r1, r12
// Fall through to memmove
.cfi_endproc
END(bcopy)
ENTRY(memmove)
_memmove_words:
.cfi_startproc
.save {r0, lr}
cmp r2, #0
it ne
subsne r12, r0, r1
it eq
bxeq lr
// memmove only if r1 < r0 < r1+r2
cmp r0, r1
itt ge
addge r12, r1, r2
cmpge r12, r0
it le
ble memcpy
cmp r2, #63
ble .Lneon_b2f_smallcopy
push {r0, lr}
add r0, r0, r2
add r1, r1, r2
mov r12, r2, lsr #6
add r0, r0, #32
add r1, r1, #32
cmp r12, #PLDTHRESH
ble .Lneon_b2f_copy_64_loop_nopld
sub r12, #PLDOFFS
sub lr, r1, #(PLDOFFS)*PLDSIZE
.Lneon_b2f_copy_64_loop_outer:
pld [lr]
sub r1, r1, #96
sub r0, r0, #96
vld1.32 {q0, q1}, [r1]!
vld1.32 {q2, q3}, [r1]
sub lr, lr, #64
subs r12, r12, #1
vst1.32 {q0, q1}, [r0]!
vst1.32 {q2, q3}, [r0]
bne .Lneon_b2f_copy_64_loop_outer
mov r12, #PLDOFFS
.Lneon_b2f_copy_64_loop_nopld:
sub r1, r1, #96
sub r0, r0, #96
vld1.32 {q8, q9}, [r1]!
vld1.32 {q10, q11}, [r1]
subs r12, r12, #1
vst1.32 {q8, q9}, [r0]!
vst1.32 {q10, q11}, [r0]
bne .Lneon_b2f_copy_64_loop_nopld
ands r2, r2, #0x3f
beq .Lneon_memmove_done
sub r1, r1, #32
sub r0, r0, #32
cmp r2, #32
blt .Lneon_b2f_copy_8
.Lneon_b2f_copy_32:
sub r1, r1, #32
sub r0, r0, #32
vld1.32 {q0, q1}, [r1]
vst1.32 {q0, q1}, [r0]
ands r2, r2, #0x1f
beq .Lneon_memmove_done
.Lneon_b2f_copy_8:
movs r12, r2, lsr #0x3
beq .Lneon_b2f_copy_1
.Lneon_b2f_copy_8_loop:
sub r1, r1, #8
sub r0, r0, #8
vld1.32 {d0}, [r1]
subs r12, r12, #1
vst1.32 {d0}, [r0]
bne .Lneon_b2f_copy_8_loop
ands r2, r2, #0x7
beq .Lneon_memmove_done
.Lneon_b2f_copy_1:
sub r1, r1, r2
sub r0, r0, r2
ands r12, r2, #1
beq .Lneon_b2f_copy_halfword_loop
subs r2, r2, #1
ldrb r3, [r1, r2]
strb r3, [r0, r2]
beq .Lneon_memmove_done
.Lneon_b2f_copy_halfword_loop:
subs r2, r2, #2
ldrh r3, [r1, r2]
strh r3, [r0, r2]
bne .Lneon_b2f_copy_halfword_loop
.Lneon_memmove_done:
pop {r0, pc}
.Lneon_b2f_smallcopy:
ands r12, r2, #1
beq .Lneon_b2f_halfword_small_loop
subs r2, r2, #1
ldrb r3, [r1, r2]
strb r3, [r0, r2]
it eq
bxeq lr
.Lneon_b2f_halfword_small_loop:
subs r2, r2, #2
ldrh r3, [r1, r2]
strh r3, [r0, r2]
bne .Lneon_b2f_halfword_small_loop
bx lr
.cfi_endproc
END(memmove)
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