isa-l/erasure_code/gf_vect_mad_sse.asm

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

%include "reg_sizes.asm"

%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 return rax
 %define return.w eax
 %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
	movdqa	[rsp+16*0],xmm6
	movdqa	[rsp+16*1],xmm7
	movdqa	[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
	movdqa	xmm6, [rsp+16*0]
	movdqa	xmm7, [rsp+16*1]
	movdqa	xmm8, [rsp+16*2]
	mov	r12,  [rsp + 3*16 + 0*8]
	mov	r15,  [rsp + 3*16 + 1*8]
	add	rsp, stack_size
%endmacro

%elifidn __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 return rax
 %define return.w eax

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

;;; gf_vect_mad_sse(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 dest  arg5
%define pos   return
%define pos.w return.w

%ifndef EC_ALIGNED_ADDR
;;; Use Un-aligned load/store
 %define XLDR movdqu
 %define XSTR movdqu
%else
;;; Use Non-temporal load/stor
 %ifdef NO_NT_LDST
  %define XLDR movdqa
  %define XSTR movdqa
 %else
  %define XLDR movntdqa
  %define XSTR movntdq
 %endif
%endif

default rel

[bits 64]
section .text

%define xmask0f  xmm8
%define xgft_lo  xmm7
%define xgft_hi  xmm6

%define x0     xmm0
%define xtmpa  xmm1
%define xtmph  xmm2
%define xtmpl  xmm3
%define xd     xmm4
%define xtmpd  xmm5


align 16
mk_global gf_vect_mad_sse, function
func(gf_vect_mad_sse)
	FUNC_SAVE
	sub	len, 16
	jl	.return_fail

	xor	pos, pos
	movdqa	xmask0f, [mask0f]	;Load mask of lower nibble in each byte
	sal	vec_i, 5		;Multiply by 32
	movdqu	xgft_lo, [vec_i+mul_array]	;Load array Cx{00}, Cx{01}, Cx{02}, ...
	movdqu	xgft_hi, [vec_i+mul_array+16]	; " Cx{00}, Cx{10}, Cx{20}, ... , Cx{f0}

	XLDR	xtmpd, [dest+len]	;backup the last 16 bytes in dest

.loop16:
	XLDR	xd, [dest+pos]		;Get next dest vector
.loop16_overlap:
	XLDR	x0, [src+pos]		;Get next source vector
	movdqa	xtmph, xgft_hi		;Reload const array registers
	movdqa	xtmpl, xgft_lo
	movdqa	xtmpa, x0		;Keep unshifted copy of src
	psraw	x0, 4			;Shift to put high nibble into bits 4-0
	pand	x0, xmask0f		;Mask high src nibble in bits 4-0
	pand	xtmpa, xmask0f		;Mask low src nibble in bits 4-0
	pshufb	xtmph, x0		;Lookup mul table of high nibble
	pshufb	xtmpl, xtmpa		;Lookup mul table of low nibble
	pxor	xtmph, xtmpl		;GF add high and low partials

	pxor	xd, xtmph
	XSTR	[dest+pos], xd		;Store result

	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
	movdqa	xd, xtmpd	;Restore xd
	jmp	.loop16_overlap	;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

;;;       func            core, ver, snum
slversion gf_vect_mad_sse, 00,  01,  0200