libgo: update to Go1.17rc2

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/341629

1 files changed, 27 insertions, 0 deletions

diff --git a/libgo/go/internal/bytealg/index_ppc64x.go b/libgo/go/internal/bytealg/index_ppc64x.go
new file mode 100644
index 0000000..f8f8f50
--- /dev/null
+++ b/libgo/go/internal/bytealg/index_ppc64x.go
@@ -0,0 +1,27 @@
+// Copyright 2021 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.
+
+//go:build ignore_for_gccgo
+// +build ignore_for_gccgo
+
+package bytealg
+
+import "internal/cpu"
+
+const MaxBruteForce = 16
+
+var SupportsPower9 = cpu.PPC64.IsPOWER9
+
+func init() {
+	MaxLen = 32
+}
+
+// Cutover reports the number of failures of IndexByte we should tolerate
+// before switching over to Index.
+// n is the number of bytes processed so far.
+// See the bytes.Index implementation for details.
+func Cutover(n int) int {
+	// 1 error per 8 characters, plus a few slop to start.
+	return (n + 16) / 8
+}