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AK: Add Checked::addition_would_overflow()

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And switch the two-argument version of Checked::multiplication_would_overflow()
to use __builtin_mul_overflow_p(). This helps GCC optimize the code better.
This commit is contained in:
Sergey Bugaev
2020-04-30 11:50:26 +03:00
committed by Andreas Kling
parent 1b36ddce1d
commit 361a1b54d7
1 changed files with 7 additions and 4 deletions
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11
AK/Checked.h
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@@ -234,13 +234,16 @@ public:
return *this; return *this;
} }
template<typename U, typename V>
static bool addition_would_overflow(U u, V v)
{
return __builtin_add_overflow_p(u, v, (T)0);
}
template<typename U, typename V, typename X> template<typename U, typename V, typename X>
static bool multiplication_would_overflow(U u, V v) static bool multiplication_would_overflow(U u, V v)
{ {
Checked checked; return __builtin_mul_overflow_p(u, v, (T)0);
checked = u;
checked *= v;
return checked.has_overflow();
} }
template<typename U, typename V, typename X> template<typename U, typename V, typename X>