isa-l/erasure_code/gf_vect_mul_sse.asm

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;;;
;;; gf_vect_mul_sse(len, mul_array, src, dest)
;;;

%include "reg_sizes.asm"

%ifidn __OUTPUT_FORMAT__, elf64
 %define arg0  rdi
 %define arg1  rsi
 %define arg2  rdx
 %define arg3  rcx
 %define return rax
 %define func(x) x: endbranch
 %define FUNC_SAVE
 %define FUNC_RESTORE

%elifidn __OUTPUT_FORMAT__, win64
 %define arg0  rcx
 %define arg1  rdx
 %define arg2  r8
 %define arg3  r9
 %define return rax
 %define stack_size  5*16 + 8 	; must be an odd multiple of 8
 %define func(x) proc_frame x
 %macro FUNC_SAVE 0
	alloc_stack	stack_size
	save_xmm128	xmm6, 0*16
	save_xmm128	xmm7, 1*16
	save_xmm128	xmm13, 2*16
	save_xmm128	xmm14, 3*16
	save_xmm128	xmm15, 4*16
	end_prolog
 %endmacro

 %macro FUNC_RESTORE 0
	movdqa	xmm6, [rsp + 0*16]
	movdqa	xmm7, [rsp + 1*16]
	movdqa	xmm13, [rsp + 2*16]
	movdqa	xmm14, [rsp + 3*16]
	movdqa	xmm15, [rsp + 4*16]
	add	rsp, stack_size
 %endmacro

%endif


%define len    arg0
%define mul_array arg1
%define	src    arg2
%define dest   arg3
%define pos    return
%define tmp   r11


;;; Use Non-temporal load/stor
%ifdef NO_NT_LDST
 %define XLDR movdqa
 %define XSTR movdqa
%else
 %define XLDR movntdqa
 %define XSTR movntdq
%endif

default rel

[bits 64]
section .text

%define xmask0f  xmm15
%define xgft_lo  xmm14
%define xgft_hi  xmm13

%define x0     xmm0
%define xtmp1a xmm1
%define xtmp1b xmm2
%define xtmp1c xmm3
%define x1     xmm4
%define xtmp2a xmm5
%define xtmp2b xmm6
%define xtmp2c xmm7


align 16
mk_global gf_vect_mul_sse, function
func(gf_vect_mul_sse)
	; Check if length is multiple of 32 bytes
	mov     tmp, len
	and     tmp, 0x1f
	jnz     return_fail

	FUNC_SAVE

	mov	pos, 0
	movdqa	xmask0f, [mask0f]	;Load mask of lower nibble in each byte
	movdqu	xgft_lo, [mul_array]	;Load array Cx{00}, Cx{01}, Cx{02}, ...
	movdqu	xgft_hi, [mul_array+16]	; " Cx{00}, Cx{10}, Cx{20}, ... , Cx{f0}

loop32:
	XLDR	x0, [src+pos]		;Get next source vector
	XLDR	x1, [src+pos+16]	;Get next source vector + 16B ahead
	movdqa	xtmp1b, xgft_hi		;Reload const array registers
	movdqa	xtmp1c, xgft_lo
	movdqa	xtmp2b, xgft_hi
	movdqa	xtmp2c, xgft_lo
	movdqa	xtmp1a, x0		;Keep unshifted copy of src
	movdqa	xtmp2a, x1
	psraw	x0, 4			;Shift to put high nibble into bits 4-0
	psraw	x1, 4
	pand	xtmp1a, xmask0f		;Mask low src nibble in bits 4-0
	pand	xtmp2a, xmask0f
	pand	x0, xmask0f		;Mask high src nibble in bits 4-0
	pand	x1, xmask0f
	pshufb	xtmp1b, x0		;Lookup mul table of high nibble
	pshufb	xtmp1c, xtmp1a		;Lookup mul table of low nibble
	pshufb	xtmp2b, x1
	pshufb	xtmp2c, xtmp2a
	pxor	xtmp1b, xtmp1c		;GF add high and low partials
	pxor	xtmp2b, xtmp2c
	XSTR	[dest+pos], xtmp1b 	;Store result
	XSTR	[dest+pos+16], xtmp2b	;Store +16B result
	add	pos, 32			;Loop on 32 bytes at at time
	cmp	pos, len
	jl	loop32

	FUNC_RESTORE

return_pass:
	xor     return, return
	ret

return_fail:
	mov	return, 1
	ret

endproc_frame

section .data

align 16
mask0f:
dq 0x0f0f0f0f0f0f0f0f, 0x0f0f0f0f0f0f0f0f