RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-21 23:15:08 +00:00
Code Issues Activity Actions

AK: Add Checked::addition_would_overflow()

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

11
AK/Checked.h
View file

@ -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>