Adding upstream version 1.21.8.upstream/1.21.8

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

1 files changed, 73 insertions, 0 deletions

diff --git a/src/runtime/memclr_mipsx.s b/src/runtime/memclr_mipsx.s
new file mode 100644
index 0000000..ee3009d
--- /dev/null
+++ b/src/runtime/memclr_mipsx.s
@@ -0,0 +1,73 @@
+// 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.
+
+//go:build mips || mipsle
+
+#include "textflag.h"
+
+#ifdef GOARCH_mips
+#define MOVWHI  MOVWL
+#define MOVWLO  MOVWR
+#else
+#define MOVWHI  MOVWR
+#define MOVWLO  MOVWL
+#endif
+
+// See memclrNoHeapPointers Go doc for important implementation constraints.
+
+// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
+TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
+	MOVW	n+4(FP), R2
+	MOVW	ptr+0(FP), R1
+
+	SGTU	$4, R2, R3
+	ADDU	R2, R1, R4
+	BNE	R3, small_zero
+
+ptr_align:
+	AND	$3, R1, R3
+	BEQ	R3, setup
+	SUBU	R1, R0, R3
+	AND	$3, R3		// R3 contains number of bytes needed to align ptr
+	MOVWHI	R0, 0(R1)	// MOVWHI will write zeros up to next word boundary
+	SUBU	R3, R2
+	ADDU	R3, R1
+
+setup:
+	AND	$31, R2, R6
+	AND	$3, R2, R5
+	SUBU	R6, R4, R6	// end pointer for 32-byte chunks
+	SUBU	R5, R4, R5	// end pointer for 4-byte chunks
+
+large:
+	BEQ	R1, R6, words
+	MOVW	R0, 0(R1)
+	MOVW	R0, 4(R1)
+	MOVW	R0, 8(R1)
+	MOVW	R0, 12(R1)
+	MOVW	R0, 16(R1)
+	MOVW	R0, 20(R1)
+	MOVW	R0, 24(R1)
+	MOVW	R0, 28(R1)
+	ADDU	$32, R1
+	JMP	large
+
+words:
+	BEQ	R1, R5, tail
+	MOVW	R0, 0(R1)
+	ADDU	$4, R1
+	JMP	words
+
+tail:
+	BEQ	R1, R4, ret
+	MOVWLO	R0, -1(R4)
+
+ret:
+	RET
+
+small_zero:
+	BEQ	R1, R4, ret
+	MOVB	R0, 0(R1)
+	ADDU	$1, R1
+	JMP	small_zero