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In the first iteration of __from_chars_pow2_base's main loop, we need to remember the value of the leading significant digit for sake of the overflow check at the end (for base > 2). This patch manually unrolls this first iteration so as to not encumber the entire loop with logic that only the first iteration needs. This seems to significantly improve performance: Base Before After (seconds, lower is better) 2 9.36 9.37 8 3.66 2.93 16 2.93 1.91 32 2.39 2.24 libstdc++-v3/ChangeLog: * include/std/charconv (__from_chars_pow2_base): Manually unroll the first iteration of the main loop and simplify accordingly.