Initial QSfera import

2026-06-07 10:20:04 +03:00
commit 2315f25754
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+// Copyright 2017 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"
+
+// castagnoliUpdate updates the non-inverted crc with the given data.
+
+// func castagnoliUpdate(crc uint32, p []byte) uint32
+TEXT ·castagnoliUpdate(SB), NOSPLIT, $0-36
+	MOVWU crc+0(FP), R9     // CRC value
+	MOVD  p+8(FP), R13      // data pointer
+	MOVD  p_len+16(FP), R11 // len(p)
+
+update:
+	CMP     $16, R11
+	BLT     less_than_16
+	LDP.P   16(R13), (R8, R10)
+	CRC32CX R8, R9
+	CRC32CX R10, R9
+	SUB     $16, R11
+
+	JMP update
+
+less_than_16:
+	TBZ $3, R11, less_than_8
+
+	MOVD.P  8(R13), R10
+	CRC32CX R10, R9
+
+less_than_8:
+	TBZ $2, R11, less_than_4
+
+	MOVWU.P 4(R13), R10
+	CRC32CW R10, R9
+
+less_than_4:
+	TBZ $1, R11, less_than_2
+
+	MOVHU.P 2(R13), R10
+	CRC32CH R10, R9
+
+less_than_2:
+	TBZ $0, R11, done
+
+	MOVBU   (R13), R10
+	CRC32CB R10, R9
+
+done:
+	MOVWU R9, ret+32(FP)
+	RET
+
+// ieeeUpdate updates the non-inverted crc with the given data.
+
+// func ieeeUpdate(crc uint32, p []byte) uint32
+TEXT ·ieeeUpdate(SB), NOSPLIT, $0-36
+	MOVWU crc+0(FP), R9     // CRC value
+	MOVD  p+8(FP), R13      // data pointer
+	MOVD  p_len+16(FP), R11 // len(p)
+
+update:
+	CMP    $16, R11
+	BLT    less_than_16
+	LDP.P  16(R13), (R8, R10)
+	CRC32X R8, R9
+	CRC32X R10, R9
+	SUB    $16, R11
+
+	JMP update
+
+less_than_16:
+	TBZ $3, R11, less_than_8
+
+	MOVD.P 8(R13), R10
+	CRC32X R10, R9
+
+less_than_8:
+	TBZ $2, R11, less_than_4
+
+	MOVWU.P 4(R13), R10
+	CRC32W  R10, R9
+
+less_than_4:
+	TBZ $1, R11, less_than_2
+
+	MOVHU.P 2(R13), R10
+	CRC32H  R10, R9
+
+less_than_2:
+	TBZ $0, R11, done
+
+	MOVBU  (R13), R10
+	CRC32B R10, R9
+
+done:
+	MOVWU R9, ret+32(FP)
+	RET