isa-l/erasure_code/gf_2vect_mad_avx2.asm

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;;;
;;; gf_2vect_mad_avx2(len, vec, vec_i, mul_array, src, dest);
;;;

%include "reg_sizes.asm"

%define PS 8

%ifidn __OUTPUT_FORMAT__, win64
 %define arg0   rcx
 %define arg0.w ecx
 %define arg1  rdx
 %define arg2  r8
 %define arg3  r9
 %define arg4  r12
 %define arg5  r15

 %define tmp    r11
 %define tmp.w  r11d
 %define tmp.b  r11b
 %define tmp2   r10
 %define return rax
 %define return.w eax
 %define stack_size  16*9 + 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
	sub	rsp, stack_size
	vmovdqa	[rsp+16*0],xmm6
	vmovdqa	[rsp+16*1],xmm7
	vmovdqa	[rsp+16*2],xmm8
	vmovdqa	[rsp+16*3],xmm9
	vmovdqa	[rsp+16*4],xmm10
	vmovdqa	[rsp+16*5],xmm11
	vmovdqa	[rsp+16*6],xmm12
	vmovdqa	[rsp+16*7],xmm13
	vmovdqa	[rsp+16*8],xmm14
	save_reg	r12,  9*16 + 0*8
	save_reg	r15,  9*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]
	vmovdqa	xmm9, [rsp+16*3]
	vmovdqa	xmm10, [rsp+16*4]
	vmovdqa	xmm11, [rsp+16*5]
	vmovdqa	xmm12, [rsp+16*6]
	vmovdqa	xmm13, [rsp+16*7]
	vmovdqa	xmm14, [rsp+16*8]
	mov	r12,  [rsp + 9*16 + 0*8]
	mov	r15,  [rsp + 9*16 + 1*8]
	add	rsp, stack_size
 %endmacro
%endif

%ifidn __OUTPUT_FORMAT__, elf64
 %define arg0  rdi
 %define arg0.w edi
 %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 return rax
 %define return.w eax

 %define func(x) x: endbranch
 %define FUNC_SAVE
 %define FUNC_RESTORE
%endif

;;; gf_2vect_mad_avx2(len, vec, vec_i, mul_array, src, dest)
%define len   arg0
%define len.w arg0.w
%define vec    arg1
%define vec_i    arg2
%define mul_array arg3
%define	src   arg4
%define dest1 arg5
%define pos   return
%define pos.w return.w

%define dest2 tmp2

%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   ymm14
%define xmask0fx  xmm14
%define xgft1_lo  ymm13
%define xgft1_hi  ymm12
%define xgft2_lo  ymm11
%define xgft2_hi  ymm10

%define x0      ymm0
%define xtmpa   ymm1
%define xtmph1  ymm2
%define xtmpl1  ymm3
%define xtmph2  ymm4
%define xtmpl2  ymm5
%define xd1     ymm6
%define xd2     ymm7
%define xtmpd1  ymm8
%define xtmpd2  ymm9

align 16
mk_global gf_2vect_mad_avx2, function

func(gf_2vect_mad_avx2)
	FUNC_SAVE
	sub	len, 32
	jl	.return_fail
	xor	pos, pos
	mov	tmp.b, 0x0f
	vpinsrb	xmask0fx, xmask0fx, tmp.w, 0
	vpbroadcastb xmask0f, xmask0fx	;Construct mask 0x0f0f0f...

	sal	vec_i, 5		;Multiply by 32
	sal	vec, 5
	lea	tmp, [mul_array + vec_i]
	vmovdqu	xgft1_lo, [tmp]		;Load array Ax{00}, Ax{01}, ..., Ax{0f}
					;     "     Ax{00}, Ax{10}, ..., Ax{f0}
	vmovdqu	xgft2_lo, [tmp+vec]	;Load array Bx{00}, Bx{01}, ..., Bx{0f}
					;     "     Bx{00}, Bx{10}, ..., Bx{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
	vperm2i128 xgft2_hi, xgft2_lo, xgft2_lo, 0x11 ; swapped to hi | hi
	vperm2i128 xgft2_lo, xgft2_lo, xgft2_lo, 0x00 ; swapped to lo | lo
	mov	dest2, [dest1+PS]	; reuse mul_array
	mov	dest1, [dest1]

	XLDR	xtmpd1, [dest1+len]	;backup the last 16 bytes in dest
	XLDR	xtmpd2, [dest2+len]	;backup the last 16 bytes in dest

.loop32:
	XLDR	xd1, [dest1+pos]		;Get next dest vector
	XLDR	xd2, [dest2+pos]		;Get next dest vector
.loop32_overlap:
	XLDR	x0, [src+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	xtmph1, xgft1_hi, x0	;Lookup mul table of high nibble
	vpshufb	xtmpl1, xgft1_lo, xtmpa	;Lookup mul table of low nibble
	vpxor	xtmph1, xtmph1, xtmpl1 ;GF add high and low partials
	vpxor	xd1, xd1, xtmph1	;xd1 += partial

	vpshufb	xtmph2, xgft2_hi, x0	;Lookup mul table of high nibble
	vpshufb	xtmpl2, xgft2_lo, xtmpa	;Lookup mul table of low nibble
	vpxor	xtmph2, xtmph2, xtmpl2 ;GF add high and low partials
	vpxor	xd2, xd2, xtmph2	;xd2 += partial

	XSTR	[dest1+pos], xd1
	XSTR	[dest2+pos], xd2

	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-32
	vmovdqa	xd1, xtmpd1	;Restore xd1
	vmovdqa	xd2, xtmpd2	;Restore xd2
	jmp	.loop32_overlap	;Do one more overlap pass

.return_pass:
	mov	return, 0
	FUNC_RESTORE
	ret

.return_fail:
	mov	return, 1
	FUNC_RESTORE
	ret

endproc_frame