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Update performance_guidelines.rst #3852

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4 changes: 3 additions & 1 deletion docs/how-to/performance_guidelines.rst
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Expand Up @@ -262,7 +262,9 @@ For example, when the control condition depends on ``threadIdx`` or ``warpSize``
warp doesn't diverge. The compiler might optimize loops, short ifs, or switch
blocks using branch predication, which prevents warp divergence. With branch
predication, instructions associated with a false predicate are scheduled but
not executed, which avoids unnecessary operations.
not executed, which avoids unnecessary operations. For control conditions where
one outcome is significantly more likely than the other, use `__builtin_expect <https://clang.llvm.org/docs/LanguageExtensions.html#builtin-expect>`_
or ``[[likely]]`` to indicate the likely condition result.

Avoiding divergent warps
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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