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;;;
;;; gf_vect_mad_avx512(len, vec, vec_i, mul_array, src, dest);
;;;

%include "reg_sizes.asm"

%ifdef HAVE_AS_KNOWS_AVX512

%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 return rax
 %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 arg5   r15
 %define tmp    r11
 %define return rax
 %define PS 8
 %define stack_size 16*3 + 3*8
 %define arg(x)      [rsp + stack_size + PS + PS*x]
 %define func(x) proc_frame x

 %macro FUNC_SAVE 0
	sub	rsp, stack_size
	vmovdqa	[rsp+16*0],xmm6
	vmovdqa	[rsp+16*1],xmm7
	vmovdqa	[rsp+16*2],xmm8
	save_reg	r12,  3*16 + 0*8
	save_reg	r15,  3*16 + 1*8
	end_prolog
	mov	arg4, arg(4)
	mov	arg5, arg(5)
 %endmacro

 %macro FUNC_RESTORE 0
	vmovdqa	xmm6, [rsp+16*0]
	vmovdqa	xmm7, [rsp+16*1]
	vmovdqa	xmm8, [rsp+16*2]
	mov	r12,  [rsp + 3*16 + 0*8]
	mov	r15,  [rsp + 3*16 + 1*8]
	add	rsp, stack_size
 %endmacro
%endif

;;; gf_vect_mad_avx512(len, vec, vec_i, mul_array, src, dest)
%define len   arg0
%define vec   arg1
%define vec_i    arg2
%define mul_array arg3
%define	src   arg4
%define dest  arg5
%define pos   return

%ifndef EC_ALIGNED_ADDR
;;; Use Un-aligned load/store
 %define XLDR vmovdqu8
 %define XSTR vmovdqu8
%else
;;; Use Non-temporal load/stor
 %ifdef NO_NT_LDST
  %define XLDR vmovdqa64
  %define XSTR vmovdqa64
 %else
  %define XLDR vmovntdqa
  %define XSTR vmovntdq
 %endif
%endif


default rel

[bits 64]
section .text

%define x0       zmm0
%define xtmpa    zmm1
%define xtmph    zmm2
%define xtmpl    zmm3
%define xd       zmm4
%define xtmpd    zmm5
%define xgft_hi  zmm6
%define xgft_lo  zmm7
%define xgft_loy ymm7
%define xmask0f  zmm8

align 16
mk_global gf_vect_mad_avx512, function
func(gf_vect_mad_avx512)
	FUNC_SAVE
	sub	len, 64
	jl	.return_fail
	xor	pos, pos
	mov	tmp, 0x0f
	vpbroadcastb xmask0f, tmp	;Construct mask 0x0f0f0f...
	sal	vec_i, 5		;Multiply by 32
	vmovdqu8 xgft_loy, [vec_i+mul_array]	;Load array Cx{00}..{0f}, Cx{00}..{f0}
	vshufi64x2 xgft_hi, xgft_lo, xgft_lo, 0x55
	vshufi64x2 xgft_lo, xgft_lo, xgft_lo, 0x00
	mov	tmp, -1
	kmovq	k1, tmp

.loop64:
	XLDR	xd, [dest+pos]		;Get next dest vector
	XLDR	x0, [src+pos]		;Get next source vector

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

	vpshufb	xtmph {k1}{z}, xgft_hi, x0	;Lookup mul table of high nibble
	vpshufb	xtmpl {k1}{z}, xgft_lo, xtmpa	;Lookup mul table of low nibble
	vpxorq	xtmph, xtmph, xtmpl	;GF add high and low partials
	vpxorq	xd, xd, xtmph		;xd += partial

	XSTR	[dest+pos], xd
	add	pos, 64			;Loop on 64 bytes at a time
	cmp	pos, len
	jle	.loop64

	lea	tmp, [len + 64]
	cmp	pos, tmp
	je	.return_pass

	;; Tail len
	mov	pos, (1 << 63)
	lea	tmp, [len + 64 - 1]
	and	tmp, 63
	sarx	pos, pos, tmp
	kmovq	k1, pos
	mov	pos, len	;Overlapped offset length-64
	jmp	.loop64		;Do one more overlap pass

.return_pass:
	mov	return, 0
	FUNC_RESTORE
	ret

.return_fail:
	mov	return, 1
	FUNC_RESTORE
	ret

endproc_frame

%else
%ifidn __OUTPUT_FORMAT__, win64
global no_gf_vect_mad_avx512
no_gf_vect_mad_avx512:
%endif
%endif  ; ifdef HAVE_AS_KNOWS_AVX512