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1ec8070e58
These builtins came in clang 3.8, but are not present in gcc through version 11. Even in clang the optimization is only ideal on x86_64, but never worse than the hand-coding that we currently do. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>