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67 lines
2.1 KiB
67 lines
2.1 KiB
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_MEMCMP16_H_
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#define ART_RUNTIME_ARCH_MEMCMP16_H_
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#include <cstddef>
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#include <cstdint>
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// memcmp16 support.
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//
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// This can either be optimized assembly code, in which case we expect a function __memcmp16,
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// or generic C support.
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//
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// In case of the generic support we declare two versions: one in this header file meant to be
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// inlined, and a static version that assembly stubs can link against.
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//
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// In both cases, MemCmp16 is declared.
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#if defined(__aarch64__) || defined(__arm__) || defined(__i386__) || defined(__x86_64__)
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extern "C" uint32_t __memcmp16(const uint16_t* s0, const uint16_t* s1, size_t count);
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#define MemCmp16 __memcmp16
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#else
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// This is the generic inlined version.
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static inline int32_t MemCmp16(const uint16_t* s0, const uint16_t* s1, size_t count) {
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for (size_t i = 0; i < count; i++) {
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if (s0[i] != s1[i]) {
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return static_cast<int32_t>(s0[i]) - static_cast<int32_t>(s1[i]);
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}
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}
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return 0;
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}
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extern "C" int32_t memcmp16_generic_static(const uint16_t* s0, const uint16_t* s1, size_t count);
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#endif
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namespace art {
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namespace testing {
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// A version that is exposed and relatively "close to the metal," so that memcmp16_test can do
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// some reasonable testing. Without this, as __memcmp16 is hidden, the test cannot access the
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// implementation.
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int32_t MemCmp16Testing(const uint16_t* s0, const uint16_t* s1, size_t count);
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} // namespace testing
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} // namespace art
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#endif // ART_RUNTIME_ARCH_MEMCMP16_H_
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