RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-14 04:54:58 +00:00
Code Issues Activity Actions

AK: Use fallback builtins for overflow checks in AK::Checked

Browse source 
If we don't have __builtin_add_overflow_p(), we can also try using
__builtin_add_overflow(). This makes debug builds with Clang
significantly faster since they no longer need to use the generic
implementation. Same for multiplication.
This commit is contained in:
Andreas Kling 2023-12-21 13:11:14 +01:00
parent 9f0aa08468
commit a264cf79c4
1 changed files with 6 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
AK/Checked.h
View file

@ -348,6 +348,9 @@ public:
{ {
#if __has_builtin(__builtin_add_overflow_p) #if __has_builtin(__builtin_add_overflow_p)
return __builtin_add_overflow_p(u, v, (T)0); return __builtin_add_overflow_p(u, v, (T)0);
#elif __has_builtin(__builtin_add_overflow)
T result;
return __builtin_add_overflow(u, v, &result);
#else #else
Checked checked; Checked checked;
checked = u; checked = u;
@ -385,6 +388,9 @@ public:
{ {
#if __has_builtin(__builtin_mul_overflow_p) #if __has_builtin(__builtin_mul_overflow_p)
return __builtin_mul_overflow_p(u, v, (T)0); return __builtin_mul_overflow_p(u, v, (T)0);
#elif __has_builtin(__builtin_mul_overflow)
T result;
return __builtin_mul_overflow(u, v, &result);
#else #else
Checked checked; Checked checked;
checked = u; checked = u;