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%include "sha1_job.asm"
%include "sha1_mb_mgr_datastruct.asm"
%include "reg_sizes.asm"

%ifdef HAVE_AS_KNOWS_AVX512
 %ifdef HAVE_AS_KNOWS_SHANI

extern sha1_mb_x16_avx512
extern sha1_ni_x1

[bits 64]
default rel
section .text

%ifidn __OUTPUT_FORMAT__, elf64
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; LINUX register definitions
%define arg1    rdi ; rcx
%define arg2    rsi ; rdx
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
%else
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; WINDOWS register definitions
%define arg1    rcx
%define arg2    rdx
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
%endif

; Common definitions and latter-state(unused,covered,unchanged)
%define state   arg1	; unchanged
%define job     arg2	; unused
%define len2    arg2	; unused

; idx must be a register not clobberred by sha1_mb_x16_avx512
%define idx             rbp	; unchanged

%define unused_lanes    rbx	; covered
%define lane_data       rbx	; covered
%define tmp2            rbx	; covered

%define num_lanes_inuse r9	; covered

%define job_rax         rax	; covered
%define tmp             rax	; unused

; STACK_SPACE needs to be an odd multiple of 8
_XMM_SAVE_SIZE  equ 10*16
_GPR_SAVE_SIZE  equ 8*8
_ALIGN_SIZE     equ 8

_XMM_SAVE       equ 0
_GPR_SAVE       equ _XMM_SAVE + _XMM_SAVE_SIZE
STACK_SPACE     equ _GPR_SAVE + _GPR_SAVE_SIZE + _ALIGN_SIZE

%define APPEND(a,b) a %+ b

; SHA1_JOB* sha1_mb_mgr_flush_avx512(SHA1_MB_JOB_MGR *state)
; arg 1 : rcx : state
mk_global sha1_mb_mgr_flush_avx512_ni, function
sha1_mb_mgr_flush_avx512_ni:
	endbranch
	sub     rsp, STACK_SPACE
	mov     [rsp + _GPR_SAVE + 8*0], rbx
	mov     [rsp + _GPR_SAVE + 8*3], rbp
	mov     [rsp + _GPR_SAVE + 8*4], r12
	mov     [rsp + _GPR_SAVE + 8*5], r13
	mov     [rsp + _GPR_SAVE + 8*6], r14
	mov     [rsp + _GPR_SAVE + 8*7], r15
%ifidn __OUTPUT_FORMAT__, win64
	mov     [rsp + _GPR_SAVE + 8*1], rsi
	mov     [rsp + _GPR_SAVE + 8*2], rdi
	vmovdqa  [rsp + _XMM_SAVE + 16*0], xmm6
	vmovdqa  [rsp + _XMM_SAVE + 16*1], xmm7
	vmovdqa  [rsp + _XMM_SAVE + 16*2], xmm8
	vmovdqa  [rsp + _XMM_SAVE + 16*3], xmm9
	vmovdqa  [rsp + _XMM_SAVE + 16*4], xmm10
	vmovdqa  [rsp + _XMM_SAVE + 16*5], xmm11
	vmovdqa  [rsp + _XMM_SAVE + 16*6], xmm12
	vmovdqa  [rsp + _XMM_SAVE + 16*7], xmm13
	vmovdqa  [rsp + _XMM_SAVE + 16*8], xmm14
	vmovdqa  [rsp + _XMM_SAVE + 16*9], xmm15
%endif

	mov	DWORD(num_lanes_inuse), [state + _num_lanes_inuse]
	cmp	num_lanes_inuse, 0
	jz	return_null

	; find a lane with a non-null job
	xor	idx, idx
%assign I 1
%rep 15
	cmp	qword [state + _ldata + I * _LANE_DATA_size + _job_in_lane], 0
	cmovne	idx, [APPEND(lane_,I)]
%assign I (I+1)
%endrep

	; copy idx to empty lanes
copy_lane_data:
	mov	tmp, [state + _args + _data_ptr + 8*idx]

%assign I 0
%rep 16
	cmp	qword [state + _ldata + I * _LANE_DATA_size + _job_in_lane], 0
	jne	APPEND(skip_,I)
	mov	[state + _args + _data_ptr + 8*I], tmp
	mov 	dword [state + _lens + 4*I], 0xFFFFFFFF
APPEND(skip_,I):
%assign I (I+1)
%endrep

	; Find min length
	vmovdqu ymm0, [state + _lens + 0*32]
	vmovdqu ymm1, [state + _lens + 1*32]

	vpminud ymm2, ymm0, ymm1        ; ymm2 has {H1,G1,F1,E1,D1,C1,B1,A1}
	vpalignr ymm3, ymm3, ymm2, 8    ; ymm3 has {x,x,H1,G1,x,x,D1,C1}
	vpminud ymm2, ymm2, ymm3        ; ymm2 has {x,x,H2,G2,x,x,D2,C2}
	vpalignr ymm3, ymm3, ymm2, 4    ; ymm3 has {x,x, x,H2,x,x, x,D2}
	vpminud ymm2, ymm2, ymm3        ; ymm2 has {x,x, x,G3,x,x, x,C3}
	vperm2i128 ymm3, ymm2, ymm2, 1	; ymm3 has {x,x, x, x,x,x, x,C3}
        vpminud ymm2, ymm2, ymm3        ; ymm2 has min value in low dword

	vmovd   DWORD(idx), xmm2
	mov	len2, idx
	and	idx, 0xF
	shr	len2, 4
	jz	len_is_0

	; compare with shani-sb threshold, if num_lanes_inuse <= threshold, using shani func
	cmp	dword [state + _num_lanes_inuse], SHA1_NI_SB_THRESHOLD_AVX512
	ja	mb_processing

	; lensN-len2=idx
	mov     [state + _lens + idx*4], DWORD(idx)
	mov	r10, idx
	or	r10, 0x4000	; avx2 has 8 lanes *4, r10b is idx, r10b2 is 32
	; "state" and "args" are the same address, arg1
	; len is arg2, idx and nlane in r10
	call    sha1_ni_x1
	; state and idx are intact
	jmp	len_is_0

mb_processing:

	vpand   ymm2, ymm2, [rel clear_low_nibble]
        vpshufd ymm2, ymm2, 0

        vpsubd  ymm0, ymm0, ymm2
        vpsubd  ymm1, ymm1, ymm2

        vmovdqu [state + _lens + 0*32], ymm0
        vmovdqu [state + _lens + 1*32], ymm1


	; "state" and "args" are the same address, arg1
	; len is arg2
	call	sha1_mb_x16_avx512
	; state and idx are intact

len_is_0:
	; process completed job "idx"
	imul	lane_data, idx, _LANE_DATA_size
	lea	lane_data, [state + _ldata + lane_data]

	mov	job_rax, [lane_data + _job_in_lane]
	mov	qword [lane_data + _job_in_lane], 0
	mov	dword [job_rax + _status], STS_COMPLETED
	mov	unused_lanes, [state + _unused_lanes]
	shl	unused_lanes, 4
	or	unused_lanes, idx
	mov	[state + _unused_lanes], unused_lanes

        mov     DWORD(num_lanes_inuse), [state + _num_lanes_inuse]
        sub     num_lanes_inuse, 1
        mov     [state + _num_lanes_inuse], DWORD(num_lanes_inuse)

	vmovd	xmm0, [state + _args_digest + 4*idx + 0*64]
	vpinsrd	xmm0, [state + _args_digest + 4*idx + 1*64], 1
	vpinsrd	xmm0, [state + _args_digest + 4*idx + 2*64], 2
	vpinsrd	xmm0, [state + _args_digest + 4*idx + 3*64], 3
	mov	DWORD(tmp2),  [state + _args_digest + 4*idx + 4*64]

	vmovdqa	[job_rax + _result_digest + 0*16], xmm0
	mov	[job_rax + _result_digest + 1*16], DWORD(tmp2)

return:

%ifidn __OUTPUT_FORMAT__, win64
	vmovdqa  xmm6, [rsp + _XMM_SAVE + 16*0]
	vmovdqa  xmm7, [rsp + _XMM_SAVE + 16*1]
	vmovdqa  xmm8, [rsp + _XMM_SAVE + 16*2]
	vmovdqa  xmm9, [rsp + _XMM_SAVE + 16*3]
	vmovdqa  xmm10, [rsp + _XMM_SAVE + 16*4]
	vmovdqa  xmm11, [rsp + _XMM_SAVE + 16*5]
	vmovdqa  xmm12, [rsp + _XMM_SAVE + 16*6]
	vmovdqa  xmm13, [rsp + _XMM_SAVE + 16*7]
	vmovdqa  xmm14, [rsp + _XMM_SAVE + 16*8]
	vmovdqa  xmm15, [rsp + _XMM_SAVE + 16*9]
	mov     rsi, [rsp + _GPR_SAVE + 8*1]
	mov     rdi, [rsp + _GPR_SAVE + 8*2]
%endif
	mov     rbx, [rsp + _GPR_SAVE + 8*0]
	mov     rbp, [rsp + _GPR_SAVE + 8*3]
	mov     r12, [rsp + _GPR_SAVE + 8*4]
	mov     r13, [rsp + _GPR_SAVE + 8*5]
	mov     r14, [rsp + _GPR_SAVE + 8*6]
	mov     r15, [rsp + _GPR_SAVE + 8*7]
	add     rsp, STACK_SPACE

	ret

return_null:
	xor	job_rax, job_rax
	jmp	return

section .data align=16

align 16
clear_low_nibble:
	dq 0x00000000FFFFFFF0, 0x0000000000000000
	dq 0x00000000FFFFFFF0, 0x0000000000000000
lane_1:     dq  1
lane_2:     dq  2
lane_3:     dq  3
lane_4:     dq  4
lane_5:     dq  5
lane_6:     dq  6
lane_7:     dq  7
lane_8:     dq  8
lane_9:     dq  9
lane_10:    dq  10
lane_11:    dq  11
lane_12:    dq  12
lane_13:    dq  13
lane_14:    dq  14
lane_15:    dq  15

 %else
  %ifidn __OUTPUT_FORMAT__, win64
   global no_sha1_mb_mgr_flush_avx512_ni
   no_sha1_mb_mgr_flush_avx512_ni:
  %endif
 %endif ; HAVE_AS_KNOWS_SHANI
%else
%ifidn __OUTPUT_FORMAT__, win64
 global no_sha1_mb_mgr_flush_avx512_ni
  no_sha1_mb_mgr_flush_avx512_ni:
 %endif
%endif ; HAVE_AS_KNOWS_AVX512
