Begin implementing decimal128_fast

[mborland]

Closes: #630

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.48872% with 6 lines in your changes missing coverage. Please review.

Project coverage is 99.1%. Comparing base (e20d482) to head (69fcbd3).

Additional details and impacted files

[](https://app.codecov.io/gh/cppalliance/decimal/pull/631?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) ```diff @@ Coverage Diff @@ ## develop #631 +/- ## ========================================= - Coverage 99.1% 99.1% -0.0% ========================================= Files 215 217 +2 Lines 14880 15014 +134 Branches 1632 1648 +16 ========================================= + Hits 14738 14866 +128 - Misses 142 148 +6 ``` | [Files](https://app.codecov.io/gh/cppalliance/decimal/pull/631?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) | Coverage Δ | | |---|---|---| | [include/boost/decimal/decimal32\_fast.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/631?src=pr&el=tree&filepath=include%2Fboost%2Fdecimal%2Fdecimal32_fast.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-aW5jbHVkZS9ib29zdC9kZWNpbWFsL2RlY2ltYWwzMl9mYXN0LmhwcA==) | `97.1% <ø> (ø)` | | | [include/boost/decimal/decimal64\_fast.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/631?src=pr&el=tree&filepath=include%2Fboost%2Fdecimal%2Fdecimal64_fast.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-aW5jbHVkZS9ib29zdC9kZWNpbWFsL2RlY2ltYWw2NF9mYXN0LmhwcA==) | `99.2% <ø> (ø)` | | | [test/random\_decimal128\_fast\_comp.cpp](https://app.codecov.io/gh/cppalliance/decimal/pull/631?src=pr&el=tree&filepath=test%2Frandom_decimal128_fast_comp.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-dGVzdC9yYW5kb21fZGVjaW1hbDEyOF9mYXN0X2NvbXAuY3Bw) | `100.0% <100.0%> (ø)` | | | [include/boost/decimal/decimal128\_fast.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/631?src=pr&el=tree&filepath=include%2Fboost%2Fdecimal%2Fdecimal128_fast.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-aW5jbHVkZS9ib29zdC9kZWNpbWFsL2RlY2ltYWwxMjhfZmFzdC5ocHA=) | `87.0% <87.0%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/cppalliance/decimal/pull/631/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/cppalliance/decimal/pull/631?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/cppalliance/decimal/pull/631?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). Last update [e20d482...69fcbd3](https://app.codecov.io/gh/cppalliance/decimal/pull/631?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance).