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diff --git a/src/runtime/memclr_mips64x.s b/src/runtime/memclr_mips64x.s
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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