// 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 avx2 = haveAVX2() var avx = haveAVX() var ssse3 = haveSSSE3() var armSha = haveArmSha() // haveAVX returns true when there is AVX support func haveAVX() bool { _, _, c, _ := cpuid(1) // Check XGETBV, OXSAVE and AVX bits if c&(1<<26) != 0 && c&(1<<27) != 0 && c&(1<<28) != 0 { // Check for OS support eax, _ := xgetbv(0) return (eax & 0x6) == 0x6 } return false } // haveAVX2 returns true when there is AVX2 support func haveAVX2() bool { mfi, _, _, _ := cpuid(0) // Check AVX2, AVX2 requires OS support, but BMI1/2 don't. if mfi >= 7 && haveAVX() { _, ebx, _, _ := cpuidex(7, 0) return (ebx & 0x00000020) != 0 } return false } // haveSSSE3 returns true when there is SSSE3 support func haveSSSE3() bool { _, _, c, _ := cpuid(1) return (c & 0x00000200) != 0 }