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  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.
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      notice, this list of conditions and the following disclaimer in
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

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  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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**********************************************************************/
	.arch armv8-a+crc
	.text

#include "lz0a_const_aarch64.h"
#include "data_struct_aarch64.h"
#include "huffman_aarch64.h"
#include "bitbuf2_aarch64.h"
#include "stdmac_aarch64.h"

/*
declare Macros
*/
.macro	declare_generic_reg name:req,reg:req,default:req
	\name		.req	\default\reg
	w_\name		.req	w\reg
	x_\name		.req	x\reg
.endm

/*
void isal_deflate_icf_finish_hash_hist_aarch64(struct isal_zstream *stream);
*/

/* constant */

/* offset of struct isal_zstream */
.equ	offset_next_in, 0
.equ	offset_avail_in, 8
.equ	offset_total_in, 12
.equ	offset_next_out, 16
.equ	offset_avail_out, 24
.equ	offset_total_out, 28
.equ	offset_hufftables, 32
.equ	offset_level, 40
.equ	offset_level_buf_size, 44
.equ	offset_level_buf, 48
.equ	offset_end_of_stream, 56
.equ	offset_flush, 58
.equ	offset_gzip_flag, 60
.equ	offset_hist_bits, 62
.equ	offset_state, 64
.equ	offset_state_block_end, 72
.equ	offset_state_state, 84
.equ	offset_state_has_hist, 135

/* offset of struct level_buf */
.equ	offset_encode_tables, 0
.equ	offset_hist, 2176
.equ	offset_hist_d_hist, 2176
.equ	offset_hist_ll_hist, 2296
.equ	offset_deflate_hdr_count, 4348
.equ	offset_deflate_hdr_extra_bits, 4352
.equ	offset_deflate_hdr, 4356
.equ	offset_icf_buf_next, 4688
.equ	offset_icf_buf_avail_out, 4696
.equ	offset_icf_buf_start, 4704
.equ	offset_hash8k, 4712
.equ	offset_hash_hist, 4712

/* offset of struct isal_zstate */
.equ	offset_dist_mask, 12
.equ	offset_hash_mask, 16
.equ	offset_state_of_zstate, 20

/* macros*/
.equ	ISAL_LOOK_AHEAD, 288

	/* arguments */
	declare_generic_reg	stream,			0,x

	declare_generic_reg	param0,			0,x
	declare_generic_reg	param1,			1,x
	declare_generic_reg	param2,			2,x
	declare_generic_reg	param3,			3,x
	declare_generic_reg	param4,			4,x
	declare_generic_reg	param5,			5,x
	declare_generic_reg	param6,			6,x

	/* local variable */
	declare_generic_reg	stream_saved,		15,x
	declare_generic_reg	level_buf,		13,x
	declare_generic_reg	start_in,		21,x
	declare_generic_reg	start_out,		22,x
	declare_generic_reg	state,			23,x
	declare_generic_reg	end_out,		12,x
	declare_generic_reg	end_in,			11,x
	declare_generic_reg	next_in,		8,x
	declare_generic_reg	next_out,		10,x
	declare_generic_reg	next_out_iter,		5,x
	declare_generic_reg	file_start,		18,x
	declare_generic_reg	last_seen,		14,x

	declare_generic_reg	literal_code,		9,w
	declare_generic_reg	hash_mask,		19,w
	declare_generic_reg	hist_size,		20,w
	declare_generic_reg	dist,			7,w
	declare_generic_reg	dist_inc,		24,w

	declare_generic_reg	tmp0,			25,x
	declare_generic_reg	tmp1,			26,x
	declare_generic_reg	tmp2,			27,x
	declare_generic_reg	tmp3,			28,x

	.align	2
	.type	write_deflate_icf_constprop, %function
write_deflate_icf_constprop:
	ldrh	w2, [x0]
	mov	w3, 30
	bfi	w2, w1, 0, 10
	strh	w2, [x0]
	ldr	w1, [x0]
	bfi	w1, w3, 10, 9
	str	w1, [x0]
	ubfx	x1, x1, 16, 3
	strh	w1, [x0, 2]
	ret
	.size	write_deflate_icf_constprop, .-write_deflate_icf_constprop

	.align	2
	.type	write_deflate_icf, %function
write_deflate_icf:
	ldrh	w4, [x0]
	bfi	w4, w1, 0, 10
	strh	w4, [x0]
	ldr	w1, [x0]
	bfi	w1, w2, 10, 9
	str	w1, [x0]
	lsr	w1, w1, 16
	bfi	w1, w3, 3, 13
	strh	w1, [x0, 2]
	ret
	.size	write_deflate_icf, .-write_deflate_icf

	.align	2
	.type	update_state, %function
update_state:
	sub	x7, x2, x1
	ldr	x4, [x0, 48]
	cmp	x7, 0
	ble	.L48
	mov	w1, 1
	strb	w1, [x0, 135]
.L48:
	ldr	w1, [x0, 12]
	sub	x6, x6, x5
	str	x2, [x0]
	sub	x3, x3, x2
	add	w1, w1, w7
	stp	w3, w1, [x0, 8]
	str	w1, [x0, 72]
	asr	x6, x6, 2
	str	x5, [x4, 4688]
	str	x6, [x4, 4696]
	ret
	.size	update_state, .-update_state

	.align	2
	.global	isal_deflate_icf_finish_hash_hist_aarch64
	.type	isal_deflate_icf_finish_hash_hist_aarch64, %function
isal_deflate_icf_finish_hash_hist_aarch64:
	ldr	w_end_in, [stream, 8] // stream->avail_in
	cbz	w_end_in, .stream_not_available

	stp	x29, x30, [sp, -96]!
	add	x29, sp, 0
	stp	x19, x20, [sp, 16]
	stp	x21, x22, [sp, 32]
	stp	x23, x24, [sp, 48]
	stp	x25, x26, [sp, 64]
	stp	x27, x28, [sp, 80]

	mov	stream_saved, stream
	ldr	level_buf, [stream, offset_level_buf]      // 48
	ldr	start_in, [stream, offset_next_in]         // 0
	ldr	start_out, [level_buf, offset_icf_buf_next]      // 4688
	add	state, stream, offset_state // 64
	ldr	end_out, [level_buf, offset_icf_buf_avail_out] // 4696
	mov	next_in, start_in
	ldr	w_file_start, [stream, offset_total_in] // 12
	mov	tmp0, offset_hash_hist // 4712
	add	last_seen, level_buf, tmp0
	add	end_in, start_in, end_in, uxtw
	and	end_out, end_out, -4
	mov	next_out, start_out
	ldp	hist_size, hash_mask, [state, offset_dist_mask] // 12
	sub	file_start, start_in, file_start
	add	end_out, start_out, end_out
	mov	next_out_iter, next_out

	add	x0, next_in, 3
	cmp	end_in, x0 // x0 <= next_in + 3
	bls	.while_first_end

	.p2align 3
.while_first:
	cmp	next_out, end_out
	bcs	.save_and_update_state
	ldr	literal_code, [next_in]
	mov	w0, literal_code
	crc32cw	w0, wzr, w0
	and	w0, w0, hash_mask
	sub	x2, next_in, file_start
	lsl	x0, x0, 1
	ldrh	dist, [last_seen, x0]
	strh	w2, [last_seen, x0]
	sub	w2, w2, dist
	and	dist, w2, 65535
	sub	dist_inc, dist, #1
	cmp	dist_inc, hist_size
	bcs	.skip_compare258

	mov	x2, 0
	sub	w2, w_end_in, w8
	mov	x1, next_in
	sub	x0, next_in, x7, uxth

	compare_max_258_bytes param0,param1,param2,tmp2,tmp0,tmp1
	mov	w0, w_tmp2
	and	w2, w0, 65535

	cmp	w2, 3
	bhi	.while_first_match_length

.skip_compare258:
	and	literal_code, literal_code, 255 // get_lit_icf_code
	add	next_in, next_in, 1
	mov	w1, literal_code
	mov	x0, next_out
	add	x_literal_code, level_buf, x_literal_code, uxtb 2 // level_buf->hist.ll_hist

	ldr	w_tmp0, [x_literal_code, offset_hist_ll_hist] // 2296
	add	w_tmp0, w_tmp0, 1
	str	w_tmp0, [x_literal_code, offset_hist_ll_hist] // 2296

	bl	write_deflate_icf_constprop // write_deflate_icf

	add	next_out, next_out, 4
.while_first_check:
	add	x0, next_in, 3
	mov	next_out_iter, next_out
	cmp	end_in, x0
	bhi	.while_first

.while_first_end:
	cmp	next_in, end_in
	bcs	.while_2nd_end

	cmp	next_out, end_out
	bcc	.while_2nd_handle
	b	.save_and_update_state_2nd

	.p2align 2
.while_2nd:
	cmp	end_out, next_out_iter
	bls	.save_and_update_state_2nd

.while_2nd_handle:
	ldrb	w2, [next_in], 1
	mov	x0, next_out_iter
	add	next_out_iter, next_out_iter, 4
	mov	w1, w2
	add	x2, level_buf, x2, uxtb 2

	ldr	w_tmp0, [x2, offset_hist_ll_hist] // 2296
	add	w_tmp0, w_tmp0, 1
	str	w_tmp0, [x2, offset_hist_ll_hist] // 2296

	bl	write_deflate_icf_constprop
	cmp	end_in, next_in
	bne	.while_2nd

	mov	next_in, end_in
	b	.end_of_stream_check_and_exit

	.p2align 2
.while_first_match_length:
	and	w0, w0, 65535
	mov	w3, 0
	add	w1, w0, 254 // get_len_icf_code
	cmp	dist, 2
	bhi	.compute_dist_icf_code

.while_first_match_length_end:
	ubfiz	x_tmp2, x1, 2, 17
	add	x_tmp1, level_buf, x24, uxtw 2
	add	x_tmp2, level_buf, x_tmp2

	add	next_in, next_in, x2, uxth
	mov	w2, dist_inc

	ldr	w_tmp0, [x_tmp2, offset_hist_ll_hist] // 2296
	add	w_tmp0, w_tmp0, 1
	str	w_tmp0, [x_tmp2, offset_hist_ll_hist] // 2296

	mov	x0, next_out
	ldr	w_tmp0, [x_tmp1, offset_hist_d_hist] // 2176
	add	w_tmp0, w_tmp0, 1
	str	w_tmp0, [x_tmp1, offset_hist_d_hist] // 2176

	bl	write_deflate_icf
	add	next_out, next_out, 4
	b	.while_first_check

// compute_dist_icf_code
	.p2align 2
.compute_dist_icf_code:
	clz	w3, dist_inc
	mov	w0, 30
	sub	w0, w0, w3

	mov	w3, 1
	lsl	w3, w3, w0
	sub	w3, w3, #1
	and	w3, w3, dist_inc
	lsl	w4, w0, 1
	lsr	dist_inc, dist_inc, w0
	add	dist_inc, dist_inc, w4
	b	.while_first_match_length_end

.while_2nd_end:
	beq	.end_of_stream_check_and_exit
	mov	param6, end_out
	b	.update_state

.end_of_stream_check_and_exit:
	ldr	w_tmp0, [stream_saved, offset_end_of_stream] // 56
	cbz	w_tmp0, .update_state_2nd
	b	.save_and_update_state_2nd

	.p2align 3
.save_and_update_state_2nd:
	mov	w_tmp0, 2
	str	w_tmp0, [state, offset_state_of_zstate] // 20
.update_state_2nd:
	mov	param6, end_out
	b	.update_state

	.p2align 2
.save_and_update_state:
	mov	param6, end_out
	mov	param5, next_out
	mov	w_tmp0, 2
	str	w_tmp0, [state, offset_state_of_zstate] // 20
.update_state:
	mov	param4, start_out
	mov	param1, start_in
	mov	param3, end_in
	mov	param2, next_in
	mov	param0, stream_saved

	ldp	x19, x20, [sp, 16]
	ldp	x21, x22, [sp, 32]
	ldp	x23, x24, [sp, 48]
	ldp	x25, x26, [sp, 64]
	ldp	x27, x28, [sp, 80]
	ldp	x29, x30, [sp], 96

	b	update_state

	.p2align 2
.stream_not_available:
	ldr	w1, [stream, offset_end_of_stream] // 56
	cbz	w1, .done

	mov	w1, 2
	str	w1, [stream, offset_state_state] // 84
.done:
	ret

	.size	isal_deflate_icf_finish_hash_hist_aarch64, .-isal_deflate_icf_finish_hash_hist_aarch64