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;;;
;;; gf_2vect_dot_prod_avx(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 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 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

%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

%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

default rel
[bits 64]

section .text

%define xmask0f   xmm8
%define xgft1_lo  xmm7
%define xgft1_hi  xmm6
%define xgft2_lo  xmm5
%define xgft2_hi  xmm4

%define x0     xmm0
%define xtmpa  xmm1
%define xp1    xmm2
%define xp2    xmm3

align 16
mk_global gf_2vect_dot_prod_avx, function

func(gf_2vect_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
	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

.loop16:
	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}
	vmovdqu	xgft1_hi, [tmp+16]	;     "     Ax{00}, Ax{10}, ..., Ax{f0}
	vmovdqu	xgft2_lo, [tmp+vec*(32/PS)]	;Load array Bx{00}, Bx{01}, ..., Bx{0f}
	vmovdqu	xgft2_hi, [tmp+vec*(32/PS)+16]	;     "     Bx{00}, Bx{10}, ..., Bx{f0}
	add	tmp, 32
	add	vec_i, PS
	XLDR	x0, [ptr+pos]		;Get next source vector

	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

	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, 16			;Loop on 16 bytes at a time
	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
