1 files changed, 119 insertions, 0 deletions
diff --git a/vendor/github.com/minio/sha256-simd/cpuid.go b/vendor/github.com/minio/sha256-simd/cpuid.go
new file mode 100644
index 000000000..878ad4638
--- /dev/null
+++ b/vendor/github.com/minio/sha256-simd/cpuid.go
@@ -0,0 +1,119 @@
+// Minio Cloud Storage, (C) 2016 Minio, Inc.
+//
+// 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.
+//
+
+package sha256
+
+// True when SIMD instructions are available.
+var avx512 bool
+var avx2 bool
+var avx bool
+var sse bool
+var sse2 bool
+var sse3 bool
+var ssse3 bool
+var sse41 bool
+var sse42 bool
+var popcnt bool
+var sha bool
+var armSha = haveArmSha()
+
+func init() {
+	var _xsave bool
+	var _osxsave bool
+	var _avx bool
+	var _avx2 bool
+	var _avx512f bool
+	var _avx512dq bool
+	//	var _avx512pf        bool
+	//	var _avx512er        bool
+	//	var _avx512cd        bool
+	var _avx512bw bool
+	var _avx512vl bool
+	var _sseState bool
+	var _avxState bool
+	var _opmaskState bool
+	var _zmmHI256State bool
+	var _hi16ZmmState bool
+
+	mfi, _, _, _ := cpuid(0)
+
+	if mfi >= 1 {
+		_, _, c, d := cpuid(1)
+
+		sse = (d & (1 << 25)) != 0
+		sse2 = (d & (1 << 26)) != 0
+		sse3 = (c & (1 << 0)) != 0
+		ssse3 = (c & (1 << 9)) != 0
+		sse41 = (c & (1 << 19)) != 0
+		sse42 = (c & (1 << 20)) != 0
+		popcnt = (c & (1 << 23)) != 0
+		_xsave = (c & (1 << 26)) != 0
+		_osxsave = (c & (1 << 27)) != 0
+		_avx = (c & (1 << 28)) != 0
+	}
+
+	if mfi >= 7 {
+		_, b, _, _ := cpuid(7)
+
+		_avx2 = (b & (1 << 5)) != 0
+		_avx512f = (b & (1 << 16)) != 0
+		_avx512dq = (b & (1 << 17)) != 0
+		//		_avx512pf = (b & (1 << 26)) != 0
+		//		_avx512er = (b & (1 << 27)) != 0
+		//		_avx512cd = (b & (1 << 28)) != 0
+		_avx512bw = (b & (1 << 30)) != 0
+		_avx512vl = (b & (1 << 31)) != 0
+		sha = (b & (1 << 29)) != 0
+	}
+
+	// Stop here if XSAVE unsupported or not enabled
+	if !_xsave || !_osxsave {
+		return
+	}
+
+	if _xsave && _osxsave {
+		a, _ := xgetbv(0)
+
+		_sseState = (a & (1 << 1)) != 0
+		_avxState = (a & (1 << 2)) != 0
+		_opmaskState = (a & (1 << 5)) != 0
+		_zmmHI256State = (a & (1 << 6)) != 0
+		_hi16ZmmState = (a & (1 << 7)) != 0
+	} else {
+		_sseState = true
+	}
+
+	// Very unlikely that OS would enable XSAVE and then disable SSE
+	if !_sseState {
+		sse = false
+		sse2 = false
+		sse3 = false
+		ssse3 = false
+		sse41 = false
+		sse42 = false
+	}
+
+	if _avxState {
+		avx = _avx
+		avx2 = _avx2
+	}
+
+	if _opmaskState && _zmmHI256State && _hi16ZmmState {
+		avx512 = (_avx512f &&
+			_avx512dq &&
+			_avx512bw &&
+			_avx512vl)
+	}
+}