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########################################################################
# Copyright(c) 2019 Arm Corporation 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 Arm Corporation 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
# OWNER 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.
#########################################################################
.text
.global pq_gen_neon
.type pq_gen_neon, %function
/* int pq_gen_neon(int vects, int len, void **src) */
/* arguments */
w_vects .req w0 /* MUST >= 3 */
x_vects .req x0
w_len .req w1 /* MUST be 16x bytes */
x_len .req x1
x_src .req x2
/* returns */
w_ret .req w0
/* local variables */
x_dst_p .req x3
x_dst_q .req x4
x_dst_q_end .req x5
w_col .req w6
x_col .req x6
x_src_ptr .req x7
x_src_ptr_end .req x9
x_src_last .req x10
x_srcn .req x11
/* vectors */
/* v0 ~ v7 : temporary p */
/* v8 ~ v15: temporary q */
/* v16 ~ v23: next 128 bytes */
v_mask0 .req v24
v_mask1 .req v25
v_mask2 .req v26
v_mask3 .req v27
v_gf8poly .req v28
v_0x80 .req v29
/*
* src_ptr_end -->
* -------+----------+
* . | src[0] |
* . +----------+ +------------------+
* src_ptr --> | src[1] | - srcn -> | buffer |
* . +----------+ +------------------+
* . | ...... |
* . +----------+
* . | src[v-4] |
* -------+----------+ src_last +------------------+
* src --> | src[v-3] | ---------> | buffer |
* +----------+ +------------------+
* | src[v-2] | - dst_p -> | buffer |
* +----------+ +------------------+
* | src[v-1] | - dst_q -> | buffer | dst_q_end
* +----------+ +------------------+
*/
pq_gen_neon:
sub x_src_ptr_end, x_src, #8
sub w_vects, w_vects, #3
add x_src, x_src, x_vects, lsl #3
ldr x_src_last, [x_src]
ldp x_dst_p, x_dst_q, [x_src, #8]
add x_dst_q_end, x_dst_q, x_len
mov w_col, #0
movi v_gf8poly.16b, #0x1D
movi v_0x80.16b, #0x80
.Lloop128_init:
/* less than 128 byts? */
cmp w_len, #128
blo .Lloop16_init
/* save d8 ~ d15 to stack */
sub sp, sp, #64
stp d8, d9, [sp]
stp d10, d11, [sp, #16]
stp d12, d13, [sp, #32]
stp d14, d15, [sp, #48]
sub x_dst_q_end, x_dst_q_end, #128
/* batch process (vects-2)*128 bytes */
/* v0~v7: p; v8~v15: q; v16~v23: in */
.Lloop128:
ldr q0, [x_src_last, #16*0]
ldr q1, [x_src_last, #16*1]
ldr q2, [x_src_last, #16*2]
ldr q3, [x_src_last, #16*3]
ldr q4, [x_src_last, #16*4]
ldr q5, [x_src_last, #16*5]
ldr q6, [x_src_last, #16*6]
ldr q7, [x_src_last, #16*7]
add x_src_last, x_src_last, #128
mov v8.16b, v0.16b
mov v9.16b, v1.16b
mov v10.16b, v2.16b
mov v11.16b, v3.16b
mov v12.16b, v4.16b
mov v13.16b, v5.16b
mov v14.16b, v6.16b
mov v15.16b, v7.16b
cbz w_vects, .Lloop128_vects_end
sub x_src_ptr, x_src, #8
.Lloop128_vects:
ldr x_srcn, [x_src_ptr], #-8
add x_srcn, x_srcn, x_col
cmp x_src_ptr, x_src_ptr_end
ldr q16, [x_srcn, #16*0]
ldr q17, [x_srcn, #16*1]
ldr q18, [x_srcn, #16*2]
ldr q19, [x_srcn, #16*3]
ldr q20, [x_srcn, #16*4]
ldr q21, [x_srcn, #16*5]
ldr q22, [x_srcn, #16*6]
ldr q23, [x_srcn, #16*7]
eor v0.16b, v0.16b, v16.16b
eor v1.16b, v1.16b, v17.16b
eor v2.16b, v2.16b, v18.16b
eor v3.16b, v3.16b, v19.16b
eor v4.16b, v4.16b, v20.16b
eor v5.16b, v5.16b, v21.16b
eor v6.16b, v6.16b, v22.16b
eor v7.16b, v7.16b, v23.16b
cmhs v_mask0.16b, v8.16b, v_0x80.16b
cmhs v_mask1.16b, v9.16b, v_0x80.16b
cmhs v_mask2.16b, v10.16b, v_0x80.16b
cmhs v_mask3.16b, v11.16b, v_0x80.16b
and v_mask0.16b, v_mask0.16b, v_gf8poly.16b
and v_mask1.16b, v_mask1.16b, v_gf8poly.16b
and v_mask2.16b, v_mask2.16b, v_gf8poly.16b
and v_mask3.16b, v_mask3.16b, v_gf8poly.16b
shl v8.16b, v8.16b, #1
shl v9.16b, v9.16b, #1
shl v10.16b, v10.16b, #1
shl v11.16b, v11.16b, #1
eor v8.16b, v8.16b, v_mask0.16b
eor v9.16b, v9.16b, v_mask1.16b
eor v10.16b, v10.16b, v_mask2.16b
eor v11.16b, v11.16b, v_mask3.16b
eor v8.16b, v8.16b, v16.16b
eor v9.16b, v9.16b, v17.16b
eor v10.16b, v10.16b, v18.16b
eor v11.16b, v11.16b, v19.16b
cmhs v_mask0.16b, v12.16b, v_0x80.16b
cmhs v_mask1.16b, v13.16b, v_0x80.16b
cmhs v_mask2.16b, v14.16b, v_0x80.16b
cmhs v_mask3.16b, v15.16b, v_0x80.16b
and v_mask0.16b, v_mask0.16b, v_gf8poly.16b
and v_mask1.16b, v_mask1.16b, v_gf8poly.16b
and v_mask2.16b, v_mask2.16b, v_gf8poly.16b
and v_mask3.16b, v_mask3.16b, v_gf8poly.16b
shl v12.16b, v12.16b, #1
shl v13.16b, v13.16b, #1
shl v14.16b, v14.16b, #1
shl v15.16b, v15.16b, #1
eor v12.16b, v12.16b, v_mask0.16b
eor v13.16b, v13.16b, v_mask1.16b
eor v14.16b, v14.16b, v_mask2.16b
eor v15.16b, v15.16b, v_mask3.16b
eor v12.16b, v12.16b, v20.16b
eor v13.16b, v13.16b, v21.16b
eor v14.16b, v14.16b, v22.16b
eor v15.16b, v15.16b, v23.16b
bne .Lloop128_vects
.Lloop128_vects_end:
str q0, [x_dst_p, #16*0]
str q1, [x_dst_p, #16*1]
str q2, [x_dst_p, #16*2]
str q3, [x_dst_p, #16*3]
str q4, [x_dst_p, #16*4]
str q5, [x_dst_p, #16*5]
str q6, [x_dst_p, #16*6]
str q7, [x_dst_p, #16*7]
str q8, [x_dst_q, #16*0]
str q9, [x_dst_q, #16*1]
str q10, [x_dst_q, #16*2]
str q11, [x_dst_q, #16*3]
str q12, [x_dst_q, #16*4]
str q13, [x_dst_q, #16*5]
str q14, [x_dst_q, #16*6]
str q15, [x_dst_q, #16*7]
add x_dst_p, x_dst_p, #128
add x_dst_q, x_dst_q, #128
cmp x_dst_q, x_dst_q_end
add w_col, w_col, #128
bls .Lloop128
.Lloop128_end:
/* restore d8 ~ d15 */
ldp d8, d9, [sp]
ldp d10, d11, [sp, #16]
ldp d12, d13, [sp, #32]
ldp d14, d15, [sp, #48]
add sp, sp, #64
add x_dst_q_end, x_dst_q_end, #128
.Lloop16_init:
tst w_len, #0x7F
beq .Lloop16_end
sub x_dst_q_end, x_dst_q_end, #16
/* batch process (vects-2)*16 bytes */
/* v0: p; v1: q; v2: in; v3: mask */
.Lloop16:
ldr q0, [x_src_last], #16
mov v1.16b, v0.16b
cbz w_vects, .Lloop16_vects_end
sub x_src_ptr, x_src, #8
.Lloop16_vects:
ldr x_srcn, [x_src_ptr], #-8
ldr q2, [x_srcn, x_col]
cmp x_src_ptr, x_src_ptr_end
eor v0.16b, v0.16b, v2.16b
cmhs v3.16b, v1.16b, v_0x80.16b
and v3.16b, v3.16b, v_gf8poly.16b
shl v1.16b, v1.16b, #1
eor v1.16b, v1.16b, v2.16b
eor v1.16b, v1.16b, v3.16b
bne .Lloop16_vects
.Lloop16_vects_end:
str q0, [x_dst_p], #16
str q1, [x_dst_q], #16
cmp x_dst_q, x_dst_q_end
add w_col, w_col, #16
bls .Lloop16
.Lloop16_end:
mov w_ret, #0
ret
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