Improve performance of widening muls

[mborland]

Closes: #433

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.89%. Comparing base (3382905) to head (da5239c).
⚠️ Report is 22 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #461      +/-   ##
===========================================
- Coverage    95.99%   95.89%   -0.11%     
===========================================
  Files           83       85       +2     
  Lines         7323     7399      +76     
  Branches      2595     2625      +30     
===========================================
+ Hits          7030     7095      +65     
  Misses          54       54              
- Partials       239      250      +11     

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