Adding upstream version 1.19.8.upstream/1.19.8upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/runtime/memclr_riscv64.s b/src/runtime/memclr_riscv64.s
new file mode 100644
index 0000000..f0e517a
--- /dev/null
+++ b/src/runtime/memclr_riscv64.s
@@ -0,0 +1,48 @@
+// 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<ABIInternal>(SB),NOSPLIT,$0-16
+#ifndef GOEXPERIMENT_regabiargs
+	MOV	ptr+0(FP), A0
+	MOV	n+8(FP), A1
+#endif
+	ADD	A0, A1, T4
+
+	// If less than eight bytes, do one byte at a time.
+	SLTU	$8, A1, T3
+	BNE	T3, ZERO, outcheck
+
+	// Do one byte at a time until eight-aligned.
+	JMP	aligncheck
+align:
+	MOVB	ZERO, (A0)
+	ADD	$1, A0
+aligncheck:
+	AND	$7, A0, 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, (A0)
+	ADD	$8, A0
+wordscheck:
+	SLTU	T5, A0, T3
+	BNE	T3, ZERO, words
+
+	JMP	outcheck
+out:
+	MOVB	ZERO, (A0)
+	ADD	$1, A0
+outcheck:
+	BNE	A0, T4, out
+
+done:
+	RET