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AK: Use __has_builtin() in Checked.h

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Instead of avoiding overflow-checking builtins with AK_COMPILER_CLANG,
we can use the preprocessor's __has_builtin() mechanism to check if
they are available.
This commit is contained in:
Andreas Kling 2022-12-17 20:09:21 +01:00 • committed by Tim Flynn
parent c4bc889346
commit f11e6beca8
1 changed files with 6 additions and 6 deletions
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12
AK/Checked.h
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@ -328,26 +328,26 @@ public:
template<typename U, typename V> template<typename U, typename V>
[[nodiscard]] static constexpr bool addition_would_overflow(U u, V v) [[nodiscard]] static constexpr bool addition_would_overflow(U u, V v)
{ {
#if defined(AK_COMPILER_CLANG) #if __has_builtin(__builtin_add_overflow_p)
return __builtin_add_overflow_p(u, v, (T)0);
#else
Checked checked; Checked checked;
checked = u; checked = u;
checked += v; checked += v;
return checked.has_overflow(); return checked.has_overflow();
#else
return __builtin_add_overflow_p(u, v, (T)0);
#endif #endif
} }
template<typename U, typename V> template<typename U, typename V>
[[nodiscard]] static constexpr bool multiplication_would_overflow(U u, V v) [[nodiscard]] static constexpr bool multiplication_would_overflow(U u, V v)
{ {
#if defined(AK_COMPILER_CLANG) #if __has_builtin(__builtin_mul_overflow_p)
return __builtin_mul_overflow_p(u, v, (T)0);
#else
Checked checked; Checked checked;
checked = u; checked = u;
checked *= v; checked *= v;
return checked.has_overflow(); return checked.has_overflow();
#else
return __builtin_mul_overflow_p(u, v, (T)0);
#endif #endif
} }