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Better comment.

This commit is contained in:
Daniel Lemire 2020-03-17 14:22:40 -04:00
parent 0164723a8e
commit 758dc511fb
1 changed files with 4 additions and 3 deletions
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7
src/generic/numberparsing.h
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@ -67,9 +67,10 @@ really_inline double compute_float_64(int64_t power, uint64_t i, bool negative,
// We are going to need to do some 64-bit arithmetic to get a more precise product. // We are going to need to do some 64-bit arithmetic to get a more precise product.
// We use a table lookup approach. // We use a table lookup approach.
components c = components c =
power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER]; // safe because power_of_ten_components[power - FASTFLOAT_SMALLEST_POWER];
// power_index // safe because
// <= 2*308 // power >= FASTFLOAT_SMALLEST_POWER
// and power <= FASTFLOAT_LARGEST_POWER
// we recover the mantissa of the power, it has a leading 1. It is always // we recover the mantissa of the power, it has a leading 1. It is always
// rounded down. // rounded down.
uint64_t factor_mantissa = c.mantissa; uint64_t factor_mantissa = c.mantissa;