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;;;
;;; gf_2vect_dot_prod_avx2(len, vec, *g_tbls, **buffs, **dests);
;;;

%include "reg_sizes.asm"

%ifidn __OUTPUT_FORMAT__, elf64
 %define arg0  rdi
 %define arg1  rsi
 %define arg2  rdx
 %define arg3  rcx
 %define arg4  r8
 %define arg5  r9

 %define tmp   r11
 %define tmp.w r11d
 %define tmp.b r11b
 %define tmp2  r10
 %define tmp3  r9
 %define tmp4  r12		; must be saved and restored
 %define return rax
 %macro  SLDR   2
 %endmacro
 %define SSTR   SLDR
 %define PS     8
 %define LOG_PS 3

 %define func(x) x: endbranch
 %macro FUNC_SAVE 0
	push	r12
 %endmacro
 %macro FUNC_RESTORE 0
	pop	r12
 %endmacro
%endif

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

 %define arg4   r12 		; must be saved, loaded and restored
 %define tmp    r11
 %define tmp.w  r11d
 %define tmp.b  r11b
 %define tmp2   r10
 %define tmp3   r13		; must be saved and restored
 %define tmp4   r14		; must be saved and restored
 %define return rax
 %macro  SLDR   2
 %endmacro
 %define SSTR   SLDR
 %define PS     8
 %define LOG_PS 3
 %define stack_size  3*16 + 3*8 	; must be an odd multiple of 8
 %define arg(x)      [rsp + stack_size + PS + PS*x]

 %define func(x) proc_frame x
 %macro FUNC_SAVE 0
	alloc_stack	stack_size
	vmovdqa	[rsp + 0*16], xmm6
	vmovdqa	[rsp + 1*16], xmm7
	vmovdqa	[rsp + 2*16], xmm8
	save_reg	r12,  3*16 + 0*8
	save_reg	r13,  3*16 + 1*8
	save_reg	r14,  3*16 + 2*8
	end_prolog
	mov	arg4, arg(4)
 %endmacro

 %macro FUNC_RESTORE 0
	vmovdqa	xmm6, [rsp + 0*16]
	vmovdqa	xmm7, [rsp + 1*16]
	vmovdqa	xmm8, [rsp + 2*16]
	mov	r12,  [rsp + 3*16 + 0*8]
	mov	r13,  [rsp + 3*16 + 1*8]
	mov	r14,  [rsp + 3*16 + 2*8]
	add	rsp, stack_size
 %endmacro
%endif

%ifidn __OUTPUT_FORMAT__, elf32

;;;================== High Address;
;;;	arg4
;;;	arg3
;;;	arg2
;;;	arg1
;;;	arg0
;;;	return
;;;<================= esp of caller
;;;	ebp
;;;<================= ebp = esp
;;;	var0
;;;	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 var(x) [ebp - PS - PS*x]

 %define trans   ecx
 %define trans2  esi
 %define arg0    trans			;trans and trans2 are for the variables in stack
 %define arg0_m  arg(0)
 %define arg1    ebx
 %define arg2    arg2_m
 %define arg2_m  arg(2)
 %define arg3    trans
 %define arg3_m  arg(3)
 %define arg4    trans
 %define arg4_m  arg(4)
 %define tmp	 edx
 %define tmp.w   edx
 %define tmp.b   dl
 %define tmp2    edi
 %define tmp3    trans2
 %define tmp4    trans2
 %define tmp4_m  var(0)
 %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
	sub	esp, PS*1		;1 local variable
	push	esi
	push	edi
	push	ebx
	mov	arg1, arg(1)
 %endmacro

 %macro FUNC_RESTORE 0
	pop	ebx
	pop	edi
	pop	esi
	add	esp, PS*1		;1 local variable
	pop	ebp
 %endmacro

%endif	; output formats

%define len   arg0
%define vec   arg1
%define mul_array arg2
%define	src   arg3
%define dest1 arg4

%define vec_i tmp2
%define ptr   tmp3
%define dest2 tmp4
%define pos   return

%ifidn PS,4				;32-bit code
 %define  len_m   arg0_m
 %define  src_m   arg3_m
 %define  dest1_m arg4_m
 %define  dest2_m tmp4_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

%ifidn PS,8				;64-bit code
 %define xmask0f   ymm8
 %define xmask0fx  xmm8
 %define xgft1_lo  ymm7
 %define xgft1_hi  ymm6
 %define xgft2_lo  ymm5
 %define xgft2_hi  ymm4

 %define x0     ymm0
 %define xtmpa  ymm1
 %define xp1    ymm2
 %define xp2    ymm3
%else					;32-bit code
 %define xmask0f   ymm7
 %define xmask0fx  xmm7
 %define xgft1_lo  ymm5
 %define xgft1_hi  ymm4
 %define xgft2_lo  xgft1_lo
 %define xgft2_hi  xgft1_hi

 %define x0     ymm0
 %define xtmpa  ymm1
 %define xp1    ymm2
 %define xp2    ymm3

%endif

align 16
mk_global gf_2vect_dot_prod_avx2, function

func(gf_2vect_dot_prod_avx2)
	FUNC_SAVE
	SLDR	len, len_m
	sub	len, 32
	SSTR	len_m, len
	jl	.return_fail
	xor	pos, pos
	mov	tmp.b, 0x0f
	vpinsrb	xmask0fx, xmask0fx, tmp.w, 0
	vpbroadcastb xmask0f, xmask0fx	;Construct mask 0x0f0f0f...

	sal	vec, LOG_PS		;vec *= PS. Make vec_i count by PS
	SLDR	dest1, dest1_m
	mov	dest2, [dest1+PS]
	SSTR	dest2_m, dest2
	mov	dest1, [dest1]
	SSTR	dest1_m, dest1

.loop32:
	vpxor	xp1, xp1
	vpxor	xp2, xp2
	mov	tmp, mul_array
	xor	vec_i, vec_i

.next_vect:
	SLDR	src, src_m
	mov	ptr, [src+vec_i]

	vmovdqu	xgft1_lo, [tmp]		;Load array Ax{00}, Ax{01}, ..., Ax{0f}
					;     "     Ax{00}, Ax{10}, ..., Ax{f0}
	vperm2i128 xgft1_hi, xgft1_lo, xgft1_lo, 0x11 ; swapped to hi | hi
	vperm2i128 xgft1_lo, xgft1_lo, xgft1_lo, 0x00 ; swapped to lo | lo
 %ifidn PS,8				; 64-bit code
	vmovdqu	xgft2_lo, [tmp+vec*(32/PS)]	;Load array Bx{00}, Bx{01}, ..., Bx{0f}
						;     "     Bx{00}, Bx{10}, ..., Bx{f0}
	vperm2i128 xgft2_hi, xgft2_lo, xgft2_lo, 0x11 ; swapped to hi | hi
	vperm2i128 xgft2_lo, xgft2_lo, xgft2_lo, 0x00 ; swapped to lo | lo

	XLDR	x0, [ptr+pos]		;Get next source vector
	add	tmp, 32
	add	vec_i, PS
 %else
	XLDR	x0, [ptr+pos]		;Get next source vector
 %endif

	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	xgft1_hi, x0		;Lookup mul table of high nibble
	vpshufb	xgft1_lo, xtmpa		;Lookup mul table of low nibble
	vpxor	xgft1_hi, xgft1_lo	;GF add high and low partials
	vpxor	xp1, xgft1_hi		;xp1 += partial

 %ifidn PS,4				; 32-bit code
	vmovdqu	xgft2_lo, [tmp+vec*(32/PS)]	;Load array Bx{00}, Bx{01}, ..., Bx{0f}
						;     "     Bx{00}, Bx{10}, ..., Bx{f0}
	vperm2i128 xgft2_hi, xgft2_lo, xgft2_lo, 0x11 ; swapped to hi | hi
	vperm2i128 xgft2_lo, xgft2_lo, xgft2_lo, 0x00 ; swapped to lo | lo
	add	tmp, 32
	add	vec_i, PS
 %endif
	vpshufb	xgft2_hi, x0		;Lookup mul table of high nibble
	vpshufb	xgft2_lo, xtmpa		;Lookup mul table of low nibble
	vpxor	xgft2_hi, xgft2_lo	;GF add high and low partials
	vpxor	xp2, xgft2_hi		;xp2 += partial

	cmp	vec_i, vec
	jl	.next_vect

	SLDR	dest1, dest1_m
	SLDR	dest2, dest2_m
	XSTR	[dest1+pos], xp1
	XSTR	[dest2+pos], xp2

	SLDR	len, len_m
	add	pos, 32			;Loop on 32 bytes at a time
	cmp	pos, len
	jle	.loop32

	lea	tmp, [len + 32]
	cmp	pos, tmp
	je	.return_pass

	;; Tail len
	mov	pos, len	;Overlapped offset length-16
	jmp	.loop32		;Do one more overlap pass

.return_pass:
	mov	return, 0
	FUNC_RESTORE
	ret

.return_fail:
	mov	return, 1
	FUNC_RESTORE
	ret

endproc_frame