Implement new CPU detection using cpuid, cpuidex plan9 instructions from klauspost/cpuid project, remove C code

pkg/cpu/cpu.go

@@ -0,0 +1,39 @@
+/*
+ * Minimalist Object Storage, (C) 2015 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 cpu
+
+// cpuid, cpuidex
+func cpuid(op uint32) (eax, ebx, ecx, edx uint32)
+func cpuidex(op, op2 uint32) (eax, ebx, ecx, edx uint32)
+
+// HasSSE41 - CPUID instruction verification wrapper for SSE41 extensions
+func HasSSE41() bool {
+	_, _, c, _ := cpuid(1)
+	return ((c & (1 << 19)) != 0)
+}
+
+// HasAVX - CPUID instruction verification wrapper for AVX extensions
+func HasAVX() bool {
+	_, _, c, _ := cpuid(1)
+	return ((c & (1 << 28)) != 0)
+}
+
+// HasAVX2 - CPUID instruction verification wrapper for AVX2 extensions
+func HasAVX2() bool {
+	_, b, _, _ := cpuidex(7, 0)
+	return ((b & (1 << 5)) != 0)
+}