Improvements to decimal64_fast

[mborland]

Normalize the values in the constructor and remove all the calls to normalize in the basis functions

Closes #639

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.6%. Comparing base (b4b08c2) to head (4e0b209). Report is 12 commits behind head on develop.

Additional details and impacted files

[](https://app.codecov.io/gh/cppalliance/decimal/pull/644?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance) ```diff @@ Coverage Diff @@ ## develop #644 +/- ## ========================================= - Coverage 98.7% 98.6% -0.0% ========================================= Files 219 219 Lines 15717 15636 -81 Branches 1720 1719 -1 ========================================= - Hits 15497 15414 -83 - Misses 220 222 +2 ``` | [Files](https://app.codecov.io/gh/cppalliance/decimal/pull/644?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/decimal64\_fast.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/644?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==) | `98.4% <100.0%> (-0.7%)` | :arrow_down: | | [include/boost/decimal/detail/add\_impl.hpp](https://app.codecov.io/gh/cppalliance/decimal/pull/644?src=pr&el=tree&filepath=include%2Fboost%2Fdecimal%2Fdetail%2Fadd_impl.hpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-aW5jbHVkZS9ib29zdC9kZWNpbWFsL2RldGFpbC9hZGRfaW1wbC5ocHA=) | `100.0% <100.0%> (ø)` | | | [test/test\_decimal64\_fast\_basis.cpp](https://app.codecov.io/gh/cppalliance/decimal/pull/644?src=pr&el=tree&filepath=test%2Ftest_decimal64_fast_basis.cpp&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance#diff-dGVzdC90ZXN0X2RlY2ltYWw2NF9mYXN0X2Jhc2lzLmNwcA==) | `100.0% <100.0%> (ø)` | | ... and [13 files with indirect coverage changes](https://app.codecov.io/gh/cppalliance/decimal/pull/644/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/644?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/644?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cppalliance). Last update [b4b08c2...4e0b209](https://app.codecov.io/gh/cppalliance/decimal/pull/644?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).