1 files changed, 46 insertions, 0 deletions
diff --git a/src/runtime/memclr_riscv64.s b/src/runtime/memclr_riscv64.s
new file mode 100644
index 0000000..54ddaa4
--- /dev/null
+++ b/src/runtime/memclr_riscv64.s
@@ -0,0 +1,46 @@
+// Copyright 2016 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.
+
+#include "textflag.h"
+
+// See memclrNoHeapPointers Go doc for important implementation constraints.
+
+// void runtime·memclrNoHeapPointers(void*, uintptr)
+TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-16
+	MOV	ptr+0(FP), T1
+	MOV	n+8(FP), T2
+	ADD	T1, T2, T4
+
+	// If less than eight bytes, do one byte at a time.
+	SLTU	$8, T2, T3
+	BNE	T3, ZERO, outcheck
+
+	// Do one byte at a time until eight-aligned.
+	JMP	aligncheck
+align:
+	MOVB	ZERO, (T1)
+	ADD	$1, T1
+aligncheck:
+	AND	$7, T1, T3
+	BNE	T3, ZERO, align
+
+	// Do eight bytes at a time as long as there is room.
+	ADD	$-7, T4, T5
+	JMP	wordscheck
+words:
+	MOV	ZERO, (T1)
+	ADD	$8, T1
+wordscheck:
+	SLTU	T5, T1, T3
+	BNE	T3, ZERO, words
+
+	JMP	outcheck
+out:
+	MOVB	ZERO, (T1)
+	ADD	$1, T1
+outcheck:
+	BNE	T1, T4, out
+
+done:
+	RET