1 files changed, 39 insertions, 0 deletions
diff --git a/vendor/github.com/golang/geo/s2/bits_go19.go b/vendor/github.com/golang/geo/s2/bits_go19.go
new file mode 100644
index 000000000..9532b377d
--- /dev/null
+++ b/vendor/github.com/golang/geo/s2/bits_go19.go
@@ -0,0 +1,39 @@
+// Copyright 2018 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.9
+
+package s2
+
+// This file is for the bit manipulation code post-Go 1.9.
+
+import "math/bits"
+
+// findMSBSetNonZero64 returns the index (between 0 and 63) of the most
+// significant set bit. Passing zero to this function return zero.
+func findMSBSetNonZero64(x uint64) int {
+	if x == 0 {
+		return 0
+	}
+	return 63 - bits.LeadingZeros64(x)
+}
+
+// findLSBSetNonZero64 returns the index (between 0 and 63) of the least
+// significant set bit. Passing zero to this function return zero.
+func findLSBSetNonZero64(x uint64) int {
+	if x == 0 {
+		return 0
+	}
+	return bits.TrailingZeros64(x)
+}