4d1c7cf3eb
## Summary of the Pull Request <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [x] Closes #4013 * [x] I work here. * [x] Existing tests should be OK. Real changes, just adding a lib to use. * [x] Couldn't find any existing docs about intsafe. * [x] Am core contributor. ## Detailed Description of the Pull Request / Additional comments * [x] Can we remove min/max completely or rename it in the two projects where it had to be reintroduced? This is now moved into #4152 * [x] How many usages of the old safe math are there? **79** * [x] If not a ton, can we migrate them here or in a follow on PR? This is now moved into #4153 Files with old safe math: - TerminalControl: TSFInputControl.cpp - TerminalCore: TerminalDispatch.cpp - TerminalCore: TerminalSelection.cpp - Host: directio.cpp - RendererGdi: invalidate.cpp - RendererGdi: math.cpp - RendererGdi: paint.cpp - RendererVt: paint.cpp - TerminalAdapter: adaptDispatch.cpp - Types: viewport.cpp - Types: WindowUiaProviderBase.cpp ## Validation Steps Performed
52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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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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#include <cassert>
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#include <limits>
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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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std::is_signed<Src>::value && std::is_integral<Dst>::value &&
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std::is_integral<Src>::value &&
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IntegerBitsPlusSign<Src>::value <= IntegerBitsPlusSign<int32_t>::value &&
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IntegerBitsPlusSign<Dst>::value <= IntegerBitsPlusSign<int32_t>::value &&
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!IsTypeInRangeForNumericType<Dst, Src>::value;
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__attribute__((always_inline)) static Dst Do(Src value) {
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int32_t src = value;
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typename std::conditional<std::is_signed<Dst>::value, int32_t,
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uint32_t>::type result;
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if (std::is_signed<Dst>::value) {
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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"(IntegerBitsPlusSign<Dst>::value <= 32
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? IntegerBitsPlusSign<Dst>::value
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: 32));
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} else {
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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"(IntegerBitsPlusSign<Dst>::value < 32
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? IntegerBitsPlusSign<Dst>::value
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: 31));
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}
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return static_cast<Dst>(result);
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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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