memclr_loong64.s

Documentation: runtime

     1// Copyright 2022 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "go_asm.h"
     6#include "textflag.h"
     7
     8// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
     9TEXT runtime·memclrNoHeapPointers<ABIInternal>(SB),NOSPLIT,$0-16
    10	ADDV	R4, R5, R6
    11
    12	// if less than 8 bytes, do one byte at a time
    13	SGTU	$8, R5, R8
    14	BNE	R8, out
    15
    16	// do one byte at a time until 8-aligned
    17	AND	$7, R4, R8
    18	BEQ	R8, words
    19	MOVB	R0, (R4)
    20	ADDV	$1, R4
    21	JMP	-4(PC)
    22
    23words:
    24	// do 8 bytes at a time if there is room
    25	ADDV	$-7, R6, R5
    26
    27	PCALIGN	$16
    28	SGTU	R5, R4, R8
    29	BEQ	R8, out
    30	MOVV	R0, (R4)
    31	ADDV	$8, R4
    32	JMP	-4(PC)
    33
    34out:
    35	BEQ	R4, R6, done
    36	MOVB	R0, (R4)
    37	ADDV	$1, R4
    38	JMP	-3(PC)
    39done:
    40	RET
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