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#ifndef GOEXPERIMENT_regabiargs
    11	MOVV	ptr+0(FP), R4
    12	MOVV	n+8(FP), R5
    13#endif
    14	ADDV	R4, R5, R6
    15
    16	// if less than 8 bytes, do one byte at a time
    17	SGTU	$8, R5, R8
    18	BNE	R8, out
    19
    20	// do one byte at a time until 8-aligned
    21	AND	$7, R4, R8
    22	BEQ	R8, words
    23	MOVB	R0, (R4)
    24	ADDV	$1, R4
    25	JMP	-4(PC)
    26
    27words:
    28	// do 8 bytes at a time if there is room
    29	ADDV	$-7, R6, R5
    30
    31	PCALIGN	$16
    32	SGTU	R5, R4, R8
    33	BEQ	R8, out
    34	MOVV	R0, (R4)
    35	ADDV	$8, R4
    36	JMP	-4(PC)
    37
    38out:
    39	BEQ	R4, R6, done
    40	MOVB	R0, (R4)
    41	ADDV	$1, R4
    42	JMP	-3(PC)
    43done:
    44	RET
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