1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_ARCH_MEMCMP16_H_ 18 #define ART_RUNTIME_ARCH_MEMCMP16_H_ 19 20 #include <cstddef> 21 #include <cstdint> 22 23 // memcmp16 support. 24 // 25 // This can either be optimized assembly code, in which case we expect a function __memcmp16, 26 // or generic C support. 27 // 28 // In case of the generic support we declare two versions: one in this header file meant to be 29 // inlined, and a static version that assembly stubs can link against. 30 // 31 // In both cases, MemCmp16 is declared. 32 33 #if defined(__aarch64__) || defined(__arm__) || defined(__mips) || defined(__i386__) || defined(__x86_64__) 34 35 extern "C" uint32_t __memcmp16(const uint16_t* s0, const uint16_t* s1, size_t count); 36 #define MemCmp16 __memcmp16 37 38 #else 39 40 // This is the generic inlined version. 41 static inline int32_t MemCmp16(const uint16_t* s0, const uint16_t* s1, size_t count) { 42 for (size_t i = 0; i < count; i++) { 43 if (s0[i] != s1[i]) { 44 return static_cast<int32_t>(s0[i]) - static_cast<int32_t>(s1[i]); 45 } 46 } 47 return 0; 48 } 49 50 extern "C" int32_t memcmp16_generic_static(const uint16_t* s0, const uint16_t* s1, size_t count); 51 #endif 52 53 namespace art { 54 55 namespace testing { 56 57 // A version that is exposed and relatively "close to the metal," so that memcmp16_test can do 58 // some reasonable testing. Without this, as __memcmp16 is hidden, the test cannot access the 59 // implementation. 60 int32_t MemCmp16Testing(const uint16_t* s0, const uint16_t* s1, size_t count); 61 62 } 63 64 } // namespace art 65 66 #endif // ART_RUNTIME_ARCH_MEMCMP16_H_ 67
