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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/base/cpu_utils.h"
#include "build/build_config.h"
#if defined(ARCH_CPU_X86_FAMILY)
#include "base/cpu.h"
#endif
namespace remoting {
namespace {
// Supporting SSE3 is a requirement for Chromium on x86/x64 so that is our base
// alignment. Both SSE3 (x86) and NEON (ARM) benefit from 16 byte alignment in
// libyuv so make that the default. If the CPU supports AVX2, then we will use
// that alignment instead. In the cases where AVX512 is used in libyuv, the
// alignment requirements are the same as for AVX2.
constexpr int kDefaultAlignmentBytes = 16;
#if defined(ARCH_CPU_X86_FAMILY)
constexpr int kAvx2AlignmentBytes = 32;
#endif
} // namespace
bool IsCpuSupported() {
#if defined(ARCH_CPU_X86_FAMILY)
// x86 Chromium builds target SSE3.
// See crbug.com/1251642 for more info.
if (!base::CPU().has_sse3()) {
return false;
}
#endif
return true;
}
int GetSimdMemoryAlignment() {
// We only need to calculate this once since the processor capabilities won't
// change while the process is running.
static const int alignment = []() {
#if defined(ARCH_CPU_X86_FAMILY)
if (base::CPU().has_avx2()) {
return kAvx2AlignmentBytes;
}
#endif
return kDefaultAlignmentBytes;
}();
return alignment;
}
} // namespace remoting
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