Initial commit: Go 1.23 release state

src/internal/bytealg/indexbyte_loong64.s

@@ -0,0 +1,52 @@
+// Copyright 2022 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 "go_asm.h"
+#include "textflag.h"
+
+TEXT ·IndexByte<ABIInternal>(SB),NOSPLIT,$0-40
+	// R4 = b_base
+	// R5 = b_len
+	// R6 = b_cap (unused)
+	// R7 = byte to find
+	AND	$0xff, R7
+	MOVV	R4, R6		// store base for later
+	ADDV	R4, R5		// end
+	ADDV	$-1, R4
+
+	PCALIGN	$16
+loop:
+	ADDV	$1, R4
+	BEQ	R4, R5, notfound
+	MOVBU	(R4), R8
+	BNE	R7, R8, loop
+
+	SUBV	R6, R4		// remove base
+	RET
+
+notfound:
+	MOVV	$-1, R4
+	RET
+
+TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT,$0-32
+	// R4 = s_base
+	// R5 = s_len
+	// R6 = byte to find
+	MOVV	R4, R7		// store base for later
+	ADDV	R4, R5		// end
+	ADDV	$-1, R4
+
+	PCALIGN	$16
+loop:
+	ADDV	$1, R4
+	BEQ	R4, R5, notfound
+	MOVBU	(R4), R8
+	BNE	R6, R8, loop
+
+	SUBV	R7, R4		// remove base
+	RET
+
+notfound:
+	MOVV	$-1, R4
+	RET