isa-l/erasure_code/gf_4vect_dot_prod_avx512_gfni.asm

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;;;
;;; gf_4vect_dot_prod_avx512_gfni(len, vec, *g_tbls, **buffs, **dests);
;;;

%include "reg_sizes.asm"
%include "gf_vect_gfni.inc"

%if AS_FEATURE_LEVEL >= 10

%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  r13		; must be saved and restored
 %define tmp4  r12		; must be saved and restored
 %define tmp5  r14		; must be saved and restored
 %define tmp6  r15		; must be saved and restored

 %define func(x) x: endbranch
 %macro FUNC_SAVE 0
	push	r12
	push	r13
	push	r14
	push	r15
 %endmacro
 %macro FUNC_RESTORE 0
	pop	r15
	pop	r14
	pop	r13
	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 arg5   r15 		; must be saved 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 tmp5   rdi		; must be saved and restored
 %define tmp6   rsi		; must be saved and restored
 %define stack_size  3*16 + 7*8		; must be an odd multiple of 8
 %define arg(x)      [rsp + stack_size + 8 + 8*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
	mov	[rsp + 3*16 + 0*8], r12
	mov	[rsp + 3*16 + 1*8], r13
	mov	[rsp + 3*16 + 2*8], r14
	mov	[rsp + 3*16 + 3*8], r15
	mov	[rsp + 3*16 + 4*8], rdi
	mov	[rsp + 3*16 + 5*8], rsi
	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]
	mov	r15,  [rsp + 3*16 + 3*8]
	mov	rdi,  [rsp + 3*16 + 4*8]
	mov	rsi,  [rsp + 3*16 + 5*8]
	add	rsp, stack_size
 %endmacro
%endif


%define len    arg0
%define vec    arg1
%define mul_array arg2
%define src    arg3
%define dest1  arg4
%define ptr    arg5
%define vec_i  tmp2
%define dest2  tmp3
%define dest3  tmp4
%define dest4  tmp5
%define vskip3 tmp6
%define pos    rax


%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

%define xgft1  zmm5
%define xgft2  zmm6
%define xgft3  zmm7
%define xgft4  zmm8

%define x0        zmm0
%define xp1       zmm1
%define xp2       zmm2
%define xp3       zmm3
%define xp4       zmm4

default rel
[bits 64]

section .text

;;
;; Encodes 64 bytes of all "k" sources into 4x 64 bytes (parity disks)
;;
%macro ENCODE_64B_4 0-1
%define %%KMASK %1

	vpxorq	xp1, xp1, xp1
	vpxorq	xp2, xp2, xp2
	vpxorq	xp3, xp3, xp3
	vpxorq	xp4, xp4, xp4
	mov	tmp, mul_array
	xor	vec_i, vec_i

%%next_vect:
	mov	ptr, [src + vec_i]
%if %0 == 1
	vmovdqu8 x0{%%KMASK}, [ptr + pos]	;Get next source vector (less than 64 bytes)
%else
	XLDR	x0, [ptr + pos]		;Get next source vector (64 bytes)
%endif
	add	vec_i, 8

        vbroadcastf32x2 xgft1, [tmp]
        vbroadcastf32x2 xgft2, [tmp + vec]
        vbroadcastf32x2 xgft3, [tmp + vec*2]
        vbroadcastf32x2 xgft4, [tmp + vskip3]
	add	tmp, 8

        GF_MUL_XOR EVEX, x0, xgft1, xgft1, xp1, xgft2, xgft2, xp2, xgft3, xgft3, xp3, \
                       xgft4, xgft4, xp4

	cmp	vec_i, vec
	jl	%%next_vect

%if %0 == 1
	vmovdqu8 [dest1 + pos]{%%KMASK}, xp1
	vmovdqu8 [dest2 + pos]{%%KMASK}, xp2
	vmovdqu8 [dest3 + pos]{%%KMASK}, xp3
	vmovdqu8 [dest4 + pos]{%%KMASK}, xp4
%else
	XSTR	[dest1 + pos], xp1
	XSTR	[dest2 + pos], xp2
	XSTR	[dest3 + pos], xp3
	XSTR	[dest4 + pos], xp4
%endif
%endmacro

align 16
mk_global gf_4vect_dot_prod_avx512_gfni, function
func(gf_4vect_dot_prod_avx512_gfni)
	FUNC_SAVE

	xor	pos, pos
	mov	vskip3, vec
	imul	vskip3, 8*3
	shl	vec, 3		;vec *= 8. Make vec_i count by 8
	mov	dest2, [dest1 + 8]
	mov	dest3, [dest1 + 2*8]
	mov	dest4, [dest1 + 3*8]
	mov	dest1, [dest1]

	cmp	len, 64
        jb      .len_lt_64

.loop64:

        ENCODE_64B_4

	add	pos, 64			;Loop on 64 bytes at a time
        sub     len, 64
	cmp	len, 64
	jge	.loop64

.len_lt_64:
        cmp     len, 0
        jle     .exit

        xor     tmp, tmp
        bts     tmp, len
        dec     tmp
        kmovq   k1, tmp

        ENCODE_64B_4 k1

.exit:
        vzeroupper

	FUNC_RESTORE
	ret

endproc_frame
%endif  ; if AS_FEATURE_LEVEL >= 10