Sam James <s...@gentoo.org> writes: > Alexe Stefan <stefanalex...@gmail.com> writes: > >> Does enabling USE=valgrind impact runtime performance in any way? > > A very small amount because it adds a check at runtime for whether > the application is running under Valgrind. The compiler may be able > to optimise this a bit if it can determine it's unlikely (if the > Valgrind headers don't already do this, they should probably mark > them as cold functions).
Sorry, I should say, they're hot functions but the if()s for them should be unlikely()'d.
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