Adding upstream version 1.17.13.upstream/1.17.13upstream

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

1 files changed, 50 insertions, 0 deletions

diff --git a/src/hash/crc32/crc32_arm64.go b/src/hash/crc32/crc32_arm64.go
new file mode 100644
index 0000000..0242d1d
--- /dev/null
+++ b/src/hash/crc32/crc32_arm64.go
@@ -0,0 +1,50 @@
+// 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.
+
+// ARM64-specific hardware-assisted CRC32 algorithms. See crc32.go for a
+// description of the interface that each architecture-specific file
+// implements.
+
+package crc32
+
+import "internal/cpu"
+
+func castagnoliUpdate(crc uint32, p []byte) uint32
+func ieeeUpdate(crc uint32, p []byte) uint32
+
+func archAvailableCastagnoli() bool {
+	return cpu.ARM64.HasCRC32
+}
+
+func archInitCastagnoli() {
+	if !cpu.ARM64.HasCRC32 {
+		panic("arch-specific crc32 instruction for Catagnoli not available")
+	}
+}
+
+func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
+	if !cpu.ARM64.HasCRC32 {
+		panic("arch-specific crc32 instruction for Castagnoli not available")
+	}
+
+	return ^castagnoliUpdate(^crc, p)
+}
+
+func archAvailableIEEE() bool {
+	return cpu.ARM64.HasCRC32
+}
+
+func archInitIEEE() {
+	if !cpu.ARM64.HasCRC32 {
+		panic("arch-specific crc32 instruction for IEEE not available")
+	}
+}
+
+func archUpdateIEEE(crc uint32, p []byte) uint32 {
+	if !cpu.ARM64.HasCRC32 {
+		panic("arch-specific crc32 instruction for IEEE not available")
+	}
+
+	return ^ieeeUpdate(^crc, p)
+}