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Added remark.

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Daniel Lemire 2020-11-09 20:22:45 -05:00
parent 41ee34701b
commit d26a697a4d
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include/fast_float/simple_decimal_conversion.h
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@ -360,6 +360,8 @@ adjusted_mantissa parse_long_mantissa(const char *first, const char* last) {
// credit: R. Oudompheng who first implemented this fast path (to my knowledge). // credit: R. Oudompheng who first implemented this fast path (to my knowledge).
// It is rough, but it does the job of accelerating the slow path since most // It is rough, but it does the job of accelerating the slow path since most
// long streams of digits are determined after 19 digits. // long streams of digits are determined after 19 digits.
// Note that mantissa+1 cannot overflow since mantissa < 10**19 and so
// mantissa+1 <= 10**19 < 2**64.
adjusted_mantissa am1 = compute_float<binary>(exponent, mantissa); adjusted_mantissa am1 = compute_float<binary>(exponent, mantissa);
adjusted_mantissa am2 = compute_float<binary>(exponent, mantissa+1); adjusted_mantissa am2 = compute_float<binary>(exponent, mantissa+1);
// They must both agree and be both a successful result. // They must both agree and be both a successful result.