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

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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
Notes: sideshowbarker 2024-07-17 21:11:12 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/a264cf79c4
Pull-request: https://github.com/SerenityOS/serenity/pull/22377
1 changed files with 6 additions and 0 deletions
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6
AK/Checked.h
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@ -348,6 +348,9 @@ public:
{
#if __has_builtin(__builtin_add_overflow_p)
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
Checked checked;
checked = u;
@ -385,6 +388,9 @@ public:
{
#if __has_builtin(__builtin_mul_overflow_p)
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
Checked checked;
checked = u;