isa-l/mem/mem_zero_detect_sse.asm

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%include "reg_sizes.asm"

%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 tmpb  r11b
 %define tmp3  arg4
 %define return rax
 %define func(x) x:
 %define FUNC_SAVE
 %define FUNC_RESTORE
%endif

%ifidn __OUTPUT_FORMAT__, win64
 %define arg0  rcx
 %define arg1  rdx
 %define arg2  r8
 %define arg3  r9
 %define tmp   r11
 %define tmpb  r11b
 %define tmp3  r10
 %define return rax
 %define func(x) proc_frame x
 %macro FUNC_SAVE 0
	end_prolog
 %endmacro
 %macro FUNC_RESTORE 0
 %endmacro
%endif

%define src arg0
%define	len arg1
%define ptr arg2
%define pos return

default rel

[bits 64]
section .text

align 16
global mem_zero_detect_sse:ISAL_SYM_TYPE_FUNCTION
func(mem_zero_detect_sse)
	FUNC_SAVE
	mov	pos, 0
	sub	len, 4*16
	jle	.mem_z_small_block

.mem_z_loop:
	movdqu	xmm0, [src+pos]
	movdqu	xmm1, [src+pos+1*16]
	movdqu	xmm2, [src+pos+2*16]
	movdqu	xmm3, [src+pos+3*16]
	ptest	xmm0, xmm0
	jnz	.return_fail
	ptest	xmm1, xmm1
	jnz	.return_fail
	ptest	xmm2, xmm2
	jnz	.return_fail
	ptest	xmm3, xmm3
	jnz	.return_fail
	add	pos, 4*16
	cmp	pos, len
	jl	.mem_z_loop

.mem_z_last_block:
	movdqu	xmm0, [src+len]
	movdqu	xmm1, [src+len+1*16]
	movdqu	xmm2, [src+len+2*16]
	movdqu	xmm3, [src+len+3*16]
	ptest	xmm0, xmm0
	jnz	.return_fail
	ptest	xmm1, xmm1
	jnz	.return_fail
	ptest	xmm2, xmm2
	jnz	.return_fail
	ptest	xmm3, xmm3
	jnz	.return_fail

.return_pass:
	mov	return, 0
	FUNC_RESTORE
	ret


.mem_z_small_block:
	add	len, 4*16
	cmp	len, 2*16
	jl	.mem_z_lt32
	movdqu	xmm0, [src]
	movdqu	xmm1, [src+16]
	movdqu	xmm2, [src+len-2*16]
	movdqu	xmm3, [src+len-1*16]
	ptest	xmm0, xmm0
	jnz	.return_fail
	ptest	xmm1, xmm1
	jnz	.return_fail
	ptest	xmm2, xmm2
	jnz	.return_fail
	ptest	xmm3, xmm3
	jnz	.return_fail
	jmp	.return_pass

.mem_z_lt32:
	cmp	len, 16
	jl	.mem_z_lt16
	movdqu	xmm0, [src]
	movdqu	xmm1, [src+len-16]
	ptest	xmm0, xmm0
	jnz	.return_fail
	ptest	xmm1, xmm1
	jnz	.return_fail
	jmp	.return_pass

.mem_z_lt16:
	cmp	len, 8
	jl	.mem_z_lt8
	mov	tmp, [src]
	mov	tmp3,[src+len-8]
	or	tmp, tmp3
	test	tmp, tmp
	jnz	.return_fail
	jmp	.return_pass

.mem_z_lt8:
	cmp	len, 0
	je	.return_pass
.mem_z_1byte_loop:
	mov	tmpb, [src+pos]
	cmp	tmpb, 0
	jnz	.return_fail
	add	pos, 1
	cmp	pos, len
	jl	.mem_z_1byte_loop
	jmp	.return_pass

.return_fail:
	mov	return, 1
	FUNC_RESTORE
	ret

endproc_frame