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#include "../include/aarch64_label.h"

	.arch armv8-a+crc+crypto
	.text
	.align	2

#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

.macro tzbytecnt param0:req,param1:req
	rbit	x_\param1, x_\param0
	cmp	x_\param0, 0
	clz	x_\param1, x_\param1
	mov	w_\param0, 8
	lsr	w_\param1, w_\param1, 3
	csel	w_\param0, w_\param1, w_\param0, ne
.endm

.macro write_deflate_icf param0:req,param1:req,param2:req,param3:req
	orr	w_\param1, w_\param1, w_\param3, lsl 19
	orr	w_\param1, w_\param1, w_\param2, lsl 10
	str	w_\param1, [x_\param0]
.endm

	.align	2
	.global	cdecl(gen_icf_map_h1_aarch64)
#ifndef __APPLE__
	.type	gen_icf_map_h1_aarch64, %function
#endif

	/* arguments */
	declare_generic_reg	stream_param,			0,x
	declare_generic_reg	matches_icf_lookup_param,	1,x
	declare_generic_reg	input_size_param,		2,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

	/* return */
	declare_generic_reg	ret_val,			0,x

	/* variables */
	declare_generic_reg	input_size,			3,x
	declare_generic_reg	next_in,			4,x
	declare_generic_reg	matches_icf_lookup,		6,x
	declare_generic_reg	hash_table,			7,x
	declare_generic_reg	end_in,				8,x
	declare_generic_reg	file_start,			9,x
	declare_generic_reg	hash_mask,			10,w
	declare_generic_reg	hist_size,			11,w
	declare_generic_reg	stream_saved,			12,x
	declare_generic_reg	literal_32,			13,w
	declare_generic_reg	literal_1,			14,w
	declare_generic_reg	dist,				15,w

	declare_generic_reg	tmp_has_hist,			0,w
	declare_generic_reg	tmp_offset_hash_table,		1,x
	declare_generic_reg	tmp0,				0,x
	declare_generic_reg	tmp1,				1,x
	declare_generic_reg	tmp2,				2,x
	declare_generic_reg	tmp3,				3,x
	declare_generic_reg	tmp5,				5,x

/* constant */
.equ	ISAL_LOOK_AHEAD, 288
.equ	SHORTEST_MATCH, 4
.equ	LEN_OFFSET, 254

/* mask */
.equ	mask_10bit, 1023
.equ	mask_lit_dist, 0x7800

/* 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_dist_mask, 76
.equ	offset_state_has_hist, 135

/* offset of struct level_buf */
.equ	offset_hash_map_hash_table, 4712

/*
uint64_t gen_icf_map_h1_base(struct isal_zstream *stream,
			     struct deflate_icf *matches_icf_lookup, uint64_t input_size)
*/

cdecl(gen_icf_map_h1_aarch64):
	cmp	input_size_param, (ISAL_LOOK_AHEAD-1) // 287
	bls	.fast_exit
	stp	x29, x30, [sp, -16]!

	mov	stream_saved, stream_param
	mov	matches_icf_lookup, matches_icf_lookup_param
	mov	x29, sp

	ldrb	tmp_has_hist, [stream_saved, offset_state_has_hist]
	mov	tmp_offset_hash_table, offset_hash_map_hash_table
	ldr	end_in, [stream_saved, offset_next_in]
	mov	input_size, input_size_param
	ldr	hash_table, [stream_saved, offset_level_buf]
	ldr	w_file_start, [stream_saved, offset_total_in]
	ldp	hist_size, hash_mask, [stream_saved, offset_state_dist_mask]
	add	hash_table, hash_table, tmp_offset_hash_table
	sub	file_start, end_in, file_start
	cbz	tmp_has_hist, .igzip_no_hist
	b	.while_check1

	.align 3
.igzip_no_hist:
	ldrb	w_tmp1, [end_in]
	add	next_in, end_in, 1
	ldrh	w_tmp0, [matches_icf_lookup]
	bfi	w_tmp0, w_tmp1, 0, 10
	strh	w_tmp0, [matches_icf_lookup]
	ldr	w_tmp0, [matches_icf_lookup]
	and	w_tmp0, w_tmp0, mask_10bit
	orr	w_tmp0, w_tmp0, mask_lit_dist
	str	w_tmp0, [matches_icf_lookup], 4
	ldr	w_tmp0, [end_in]
	crc32cw	w_tmp0, wzr, w_tmp0

	and	w_tmp5, w_tmp0, hash_mask
	sub	x_tmp1, end_in, file_start
	mov	w_tmp2, 1
	mov	x_tmp0, 1
	strh	w_tmp1, [hash_table, x_tmp5, lsl 1]
	strb	w_tmp2, [stream_saved, offset_state_has_hist]
	b	.while_check2

.while_check1:
	mov	next_in, end_in
	mov	x_tmp0, 0

.while_check2:
	sub	input_size, input_size, #288
	add	end_in, end_in, input_size
	cmp	next_in, end_in
	bcs	.exit
	mov	literal_32, 32
	mov	literal_1, 1
	b	.while_loop

	.align 3
.new_match_found:
	clz	w_tmp5, w_tmp2
	add	w_tmp1, w_tmp0, LEN_OFFSET
	sub	w_tmp5, literal_32, w_tmp5
	cmp	dist, 2
	sub	w_tmp5, w_tmp5, #2
	bls	.skip_compute_dist_icf_code

	lsl	w_tmp3, literal_1, w_tmp5
	sub	w_tmp3, w_tmp3, #1
	lsr	w_tmp0, w_tmp2, w_tmp5
	and	w_tmp3, w_tmp3, w_tmp2
	add	w_tmp2, w_tmp0, w_tmp5, lsl 1

.skip_compute_dist_icf_code:
	mov	param0, matches_icf_lookup
	write_deflate_icf param0,param1,param2,param3

	add	next_in, next_in, 1
	add	matches_icf_lookup, matches_icf_lookup, 4
	cmp	next_in, end_in
	beq	.save_with_exit

.while_loop:
	ldr	w_tmp0, [next_in]
	crc32cw	w_tmp0, wzr, w_tmp0

	and	w_tmp0, w_tmp0, hash_mask
	sub	x_tmp1, next_in, file_start
	lsl	x_tmp0, x_tmp0, 1
	sub	w_tmp2, w_tmp1, #1
	ldrh	w_tmp3, [hash_table, x_tmp0]
	strh	w_tmp1, [hash_table, x_tmp0]
	sub	w_tmp2, w_tmp2, w_tmp3
	and	w_tmp2, w_tmp2, hist_size
	add	dist, w_tmp2, 1
	ldr	x_tmp0, [next_in]
	sub	x_tmp1, next_in, w_dist, uxtw
	ldr	x_tmp1, [x_tmp1]
	eor	x_tmp0, x_tmp1, x_tmp0
	tzbytecnt	param0,param1

	cmp	w_tmp0, (SHORTEST_MATCH-1)
	mov	w_tmp3, 0
	bhi	.new_match_found

	ldrb	w_param1, [next_in]
	mov	x_param0, matches_icf_lookup
	mov	w_param3, 0
	mov	w_param2, 0x1e
	write_deflate_icf param0,param1,param2,param3

	add	next_in, next_in, 1
	add	matches_icf_lookup, matches_icf_lookup, 4
	cmp	next_in, end_in
	bne	.while_loop

.save_with_exit:
	ldr	ret_val, [stream_saved, offset_next_in]
	sub	ret_val, next_in, ret_val

.exit:
	ldp	x29, x30, [sp], 16
	ret

	.align 3
.fast_exit:
	mov	ret_val, 0
	ret
#ifndef __APPLE__
	.size	gen_icf_map_h1_aarch64, .-gen_icf_map_h1_aarch64
#endif