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;;;
;;; gf_vect_dot_prod_avx(len, vec, *g_tbls, **buffs, *dest);
;;;

%include "reg_sizes.asm"

%ifidn __OUTPUT_FORMAT__, elf64
 %define arg0  rdi
 %define arg1  rsi
 %define arg2  rdx
 %define arg3  rcx
 %define arg4  r8

 %define tmp   r11
 %define tmp2  r10
 %define tmp3  r9
 %define return rax
 %macro  SLDR 2
 %endmacro
 %define SSTR SLDR
 %define PS 8
 %define func(x) x: endbranch
 %define FUNC_SAVE
 %define FUNC_RESTORE
%endif

%ifidn __OUTPUT_FORMAT__, win64
 %define arg0   rcx
 %define arg1   rdx
 %define arg2   r8
 %define arg3   r9

 %define arg4   r12 		; must be saved and loaded
 %define tmp    r11
 %define tmp2   r10
 %define tmp3   rdi 		; must be saved and loaded
 %define return rax
 %macro  SLDR 2
 %endmacro
 %define SSTR SLDR
 %define PS 8
 %define frame_size 2*8
 %define arg(x)      [rsp + frame_size + PS + PS*x]

 %define func(x) proc_frame x
 %macro FUNC_SAVE 0
	rex_push_reg	r12
	push_reg	rdi
	end_prolog
	mov	arg4, arg(4)
 %endmacro

 %macro FUNC_RESTORE 0
	pop	rdi
	pop	r12
 %endmacro
%endif

%ifidn __OUTPUT_FORMAT__, elf32

;;;================== High Address;
;;;	arg4
;;;	arg3
;;;	arg2
;;;	arg1
;;;	arg0
;;;	return
;;;<================= esp of caller
;;;	ebp
;;;<================= ebp = esp
;;;	esi
;;;	edi
;;;	ebx
;;;<================= esp of callee
;;;
;;;================== Low Address;

 %define PS 4
 %define LOG_PS 2
 %define func(x) x: endbranch
 %define arg(x) [ebp + PS*2 + PS*x]

 %define trans   ecx			;trans is for the variables in stack
 %define arg0    trans
 %define arg0_m  arg(0)
 %define arg1    trans
 %define arg1_m  arg(1)
 %define arg2    arg2_m
 %define arg2_m  arg(2)
 %define arg3    ebx
 %define arg4    trans
 %define arg4_m  arg(4)
 %define tmp	 edx
 %define tmp2    edi
 %define tmp3    esi
 %define return  eax
 %macro SLDR 2	;; stack load/restore
	mov %1, %2
 %endmacro
 %define SSTR SLDR

 %macro FUNC_SAVE 0
	push	ebp
	mov	ebp, esp
	push	esi
	push	edi
	push	ebx
	mov	arg3, arg(3)
 %endmacro

 %macro FUNC_RESTORE 0
	pop	ebx
	pop	edi
	pop	esi
	mov	esp, ebp
	pop	ebp
 %endmacro

%endif	; output formats

%define len   arg0
%define vec   arg1
%define mul_array arg2
%define	src   arg3
%define dest  arg4

%define vec_i tmp2
%define ptr   tmp3
%define pos   return

 %ifidn PS,4				;32-bit code
	%define  vec_m 	arg1_m
	%define  len_m 	arg0_m
	%define  dest_m arg4_m
 %endif

%ifndef EC_ALIGNED_ADDR
;;; Use Un-aligned load/store
 %define XLDR vmovdqu
 %define XSTR vmovdqu
%else
;;; Use Non-temporal load/stor
 %ifdef NO_NT_LDST
  %define XLDR vmovdqa
  %define XSTR vmovdqa
 %else
  %define XLDR vmovntdqa
  %define XSTR vmovntdq
 %endif
%endif

%ifidn PS,8			; 64-bit code
 default rel
  [bits 64]
%endif

section .text

%define xmask0f  xmm5
%define xgft_lo  xmm4
%define xgft_hi  xmm3

%define x0     xmm0
%define xtmpa  xmm1
%define xp     xmm2

align 16
mk_global gf_vect_dot_prod_avx, function
func(gf_vect_dot_prod_avx)
	FUNC_SAVE
	SLDR 	len, len_m
	sub	len, 16
	SSTR 	len_m, len
	jl	.return_fail
	xor	pos, pos
	vmovdqa	xmask0f, [mask0f]	;Load mask of lower nibble in each byte

.loop16:
	vpxor	xp, xp
	mov	tmp, mul_array
	xor	vec_i, vec_i

.next_vect:

	mov	ptr, [src+vec_i*PS]
	vmovdqu	xgft_lo, [tmp]		;Load array Cx{00}, Cx{01}, ..., Cx{0f}
	vmovdqu	xgft_hi, [tmp+16]	;     "     Cx{00}, Cx{10}, ..., Cx{f0}
	XLDR	x0, [ptr+pos]		;Get next source vector

	add	tmp, 32
	add	vec_i, 1

	vpand	xtmpa, x0, xmask0f	;Mask low src nibble in bits 4-0
	vpsraw	x0, x0, 4		;Shift to put high nibble into bits 4-0
	vpand	x0, x0, xmask0f		;Mask high src nibble in bits 4-0

	vpshufb	xgft_hi, xgft_hi, x0	;Lookup mul table of high nibble
	vpshufb	xgft_lo, xgft_lo, xtmpa	;Lookup mul table of low nibble
	vpxor	xgft_hi, xgft_hi, xgft_lo ;GF add high and low partials
	vpxor	xp, xp, xgft_hi		;xp += partial

	SLDR	vec, vec_m
	cmp	vec_i, vec
	jl	.next_vect

	SLDR 	dest, dest_m
	XSTR	[dest+pos], xp

	add	pos, 16			;Loop on 16 bytes at a time
	SLDR 	len, len_m
	cmp	pos, len
	jle	.loop16

	lea	tmp, [len + 16]
	cmp	pos, tmp
	je	.return_pass

	;; Tail len
	mov	pos, len	;Overlapped offset length-16
	jmp	.loop16		;Do one more overlap pass

.return_pass:
	mov	return, 0
	FUNC_RESTORE
	ret

.return_fail:
	mov	return, 1
	FUNC_RESTORE
	ret

endproc_frame

section .data

align 16

mask0f:
dq 0x0f0f0f0f0f0f0f0f, 0x0f0f0f0f0f0f0f0f