From ccd992355df7192993c666236047820244914598 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Tue, 16 Apr 2024 21:19:13 +0200
Subject: Adding upstream version 1.21.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/internal/bytealg/compare_wasm.s | 115 ++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/internal/bytealg/compare_wasm.s

(limited to 'src/internal/bytealg/compare_wasm.s')

diff --git a/src/internal/bytealg/compare_wasm.s b/src/internal/bytealg/compare_wasm.s
new file mode 100644
index 0000000..dc8fb33
--- /dev/null
+++ b/src/internal/bytealg/compare_wasm.s
@@ -0,0 +1,115 @@
+// Copyright 2018 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 ·Compare(SB), NOSPLIT, $0-56
+	Get SP
+	I64Load a_base+0(FP)
+	I64Load a_len+8(FP)
+	I64Load b_base+24(FP)
+	I64Load b_len+32(FP)
+	Call cmpbody<>(SB)
+	I64Store ret+48(FP)
+	RET
+
+TEXT runtime·cmpstring(SB), NOSPLIT, $0-40
+	Get SP
+	I64Load a_base+0(FP)
+	I64Load a_len+8(FP)
+	I64Load b_base+16(FP)
+	I64Load b_len+24(FP)
+	Call cmpbody<>(SB)
+	I64Store ret+32(FP)
+	RET
+
+// params: a, alen, b, blen
+// ret: -1/0/1
+TEXT cmpbody<>(SB), NOSPLIT, $0-0
+	// len = min(alen, blen)
+	Get R1
+	Get R3
+	Get R1
+	Get R3
+	I64LtU
+	Select
+	Set R4
+
+	Get R0
+	I32WrapI64
+	Get R2
+	I32WrapI64
+	Get R4
+	I32WrapI64
+	Call memcmp<>(SB)
+	I64ExtendI32S
+	Tee R5
+
+	I64Eqz
+	If
+		// check length
+		Get R1
+		Get R3
+		I64Sub
+		Set R5
+	End
+
+	I64Const $0
+	I64Const $-1
+	I64Const $1
+	Get R5
+	I64Const $0
+	I64LtS
+	Select
+	Get R5
+	I64Eqz
+	Select
+	Return
+
+// compiled with emscripten
+// params: a, b, len
+// ret: <0/0/>0
+TEXT memcmp<>(SB), NOSPLIT, $0-0
+	Get R2
+	If $1
+	Loop
+	Get R0
+	I32Load8S $0
+	Tee R3
+	Get R1
+	I32Load8S $0
+	Tee R4
+	I32Eq
+	If
+	Get R0
+	I32Const $1
+	I32Add
+	Set R0
+	Get R1
+	I32Const $1
+	I32Add
+	Set R1
+	I32Const $0
+	Get R2
+	I32Const $-1
+	I32Add
+	Tee R2
+	I32Eqz
+	BrIf $3
+	Drop
+	Br $1
+	End
+	End
+	Get R3
+	I32Const $255
+	I32And
+	Get R4
+	I32Const $255
+	I32And
+	I32Sub
+	Else
+	I32Const $0
+	End
+	Return
-- 
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