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54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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// Copyright 2017 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
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#define BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
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// IWYU pragma: private, include "base/numerics/safe_conversions.h"
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#include <stdint.h>
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#include <algorithm>
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#include <concepts>
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#include <type_traits>
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#include "base/numerics/safe_conversions_impl.h"
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namespace base {
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namespace internal {
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// Fast saturation to a destination type.
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template <typename Dst, typename Src>
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struct SaturateFastAsmOp {
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static constexpr bool is_supported =
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kEnableAsmCode && std::signed_integral<Src> && std::integral<Dst> &&
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kIntegerBitsPlusSign<Src> <= kIntegerBitsPlusSign<int32_t> &&
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kIntegerBitsPlusSign<Dst> <= kIntegerBitsPlusSign<int32_t> &&
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!kIsTypeInRangeForNumericType<Dst, Src>;
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__attribute__((always_inline)) static Dst Do(Src value) {
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int32_t src = value;
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if constexpr (std::is_signed_v<Dst>) {
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int32_t result;
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asm("ssat %[dst], %[shift], %[src]"
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: [dst] "=r"(result)
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: [src] "r"(src), [shift] "n"(
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std::min(kIntegerBitsPlusSign<Dst>, 32)));
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return static_cast<Dst>(result);
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} else {
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uint32_t result;
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asm("usat %[dst], %[shift], %[src]"
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: [dst] "=r"(result)
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: [src] "r"(src), [shift] "n"(
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std::min(kIntegerBitsPlusSign<Dst>, 31)));
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return static_cast<Dst>(result);
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}
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}
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};
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} // namespace internal
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} // namespace base
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#endif // BASE_NUMERICS_SAFE_CONVERSIONS_ARM_IMPL_H_
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