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[ASan][libc++] Optimize __annotate_delete for the default allocator #76176

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[ASan][libc++] Optimize __annotate_delete for the default allocator #76176

wants to merge 3 commits into from

Commits on Dec 22, 2023

  1. [ASan][libc++] Optimize __annotate_delete for the default allocator 

    This commit optimizes the ASan helper functions `__annotate_delete()`, in `std::basic_string`, `std::vector` and `std::deque`, by adding `if` statements to prevent unpoisoning of memory for the default allocator. Unpoisoning is not required by the default allocator, and since it is widely used, this optimization should yield a meaningful performance improvement.

The optimization was suggested by @EricWF.
    Advenam Tacet committed Dec 22, 2023
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  2. C++03 fix

    Advenam Tacet committed Dec 22, 2023
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  3. if constexpr since C++17

    Advenam Tacet committed Dec 22, 2023
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