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Diffstat (limited to 'runtime/arch/memcmp16.h')
| -rw-r--r-- | runtime/arch/memcmp16.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/runtime/arch/memcmp16.h b/runtime/arch/memcmp16.h new file mode 100644 index 0000000..ad58588 --- /dev/null +++ b/runtime/arch/memcmp16.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2014 The Android Open Source Project + * + * 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. + */ + +#ifndef ART_RUNTIME_ARCH_MEMCMP16_H_ +#define ART_RUNTIME_ARCH_MEMCMP16_H_ + +#include <cstddef> +#include <cstdint> + +// memcmp16 support. +// +// This can either be optimized assembly code, in which case we expect a function __memcmp16, +// or generic C support. +// +// In case of the generic support we declare two versions: one in this header file meant to be +// inlined, and a static version that assembly stubs can link against. +// +// In both cases, MemCmp16 is declared. + +#if defined(__arm__) || defined(__mips) + +extern "C" uint32_t __memcmp16(const uint16_t* s0, const uint16_t* s1, size_t count); +#define MemCmp16 __memcmp16 + +#else + +// This is the generic inlined version. +static inline int32_t MemCmp16(const uint16_t* s0, const uint16_t* s1, size_t count) { + for (size_t i = 0; i < count; i++) { + if (s0[i] != s1[i]) { + return static_cast<int32_t>(s0[i]) - static_cast<int32_t>(s1[i]); + } + } + return 0; +} + +extern "C" int32_t memcmp16_generic_static(const uint16_t* s0, const uint16_t* s1, size_t count); +#endif + +#endif // ART_RUNTIME_ARCH_MEMCMP16_H_ |