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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build mips64 || mips64le
#include "go_asm.h"
#include "textflag.h"
// See memclrNoHeapPointers Go doc for important implementation constraints.
// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16
MOVV ptr+0(FP), R1
MOVV n+8(FP), R2
ADDV R1, R2, R4
// if less than 16 bytes or no MSA, do words check
SGTU $16, R2, R3
BNE R3, no_msa
MOVBU internal∕cpu·MIPS64X+const_offsetMIPS64XHasMSA(SB), R3
BEQ R3, R0, no_msa
VMOVB $0, W0
SGTU $128, R2, R3
BEQ R3, msa_large
AND $15, R2, R5
XOR R2, R5, R6
ADDVU R1, R6
msa_small:
VMOVB W0, (R1)
ADDVU $16, R1
SGTU R6, R1, R3
BNE R3, R0, msa_small
BEQ R5, R0, done
VMOVB W0, -16(R4)
JMP done
msa_large:
AND $127, R2, R5
XOR R2, R5, R6
ADDVU R1, R6
msa_large_loop:
VMOVB W0, (R1)
VMOVB W0, 16(R1)
VMOVB W0, 32(R1)
VMOVB W0, 48(R1)
VMOVB W0, 64(R1)
VMOVB W0, 80(R1)
VMOVB W0, 96(R1)
VMOVB W0, 112(R1)
ADDVU $128, R1
SGTU R6, R1, R3
BNE R3, R0, msa_large_loop
BEQ R5, R0, done
VMOVB W0, -128(R4)
VMOVB W0, -112(R4)
VMOVB W0, -96(R4)
VMOVB W0, -80(R4)
VMOVB W0, -64(R4)
VMOVB W0, -48(R4)
VMOVB W0, -32(R4)
VMOVB W0, -16(R4)
JMP done
no_msa:
// if less than 8 bytes, do one byte at a time
SGTU $8, R2, R3
BNE R3, out
// do one byte at a time until 8-aligned
AND $7, R1, R3
BEQ R3, words
MOVB R0, (R1)
ADDV $1, R1
JMP -4(PC)
words:
// do 8 bytes at a time if there is room
ADDV $-7, R4, R2
SGTU R2, R1, R3
BEQ R3, out
MOVV R0, (R1)
ADDV $8, R1
JMP -4(PC)
out:
BEQ R1, R4, done
MOVB R0, (R1)
ADDV $1, R1
JMP -3(PC)
done:
RET
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