Adding upstream version 1.21.8.upstream/1.21.8

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

1 files changed, 24 insertions, 0 deletions

diff --git a/src/runtime/cpuflags_amd64.go b/src/runtime/cpuflags_amd64.go
new file mode 100644
index 0000000..8cca4bc
--- /dev/null
+++ b/src/runtime/cpuflags_amd64.go
@@ -0,0 +1,24 @@
+// Copyright 2015 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.
+
+package runtime
+
+import (
+	"internal/cpu"
+)
+
+var useAVXmemmove bool
+
+func init() {
+	// Let's remove stepping and reserved fields
+	processor := processorVersionInfo & 0x0FFF3FF0
+
+	isIntelBridgeFamily := isIntel &&
+		processor == 0x206A0 ||
+		processor == 0x206D0 ||
+		processor == 0x306A0 ||
+		processor == 0x306E0
+
+	useAVXmemmove = cpu.X86.HasAVX && !isIntelBridgeFamily
+}