Dont use double or int64 when using fast_math

[pfultz2]

Motivation

Double precision and 64bit math is very slow on the GPU so dont use it when fast_math is enabled.

Technical Details

Changelog Category

Add a CHANGELOG.md entry for any option other than Not Applicable

• • Added: New functionality.
• • Changed: Changes to existing functionality.
• • Removed: Functionality or support that has been removed. (Compared to a previous release)
• • Optimized: Component performance that has been optimized or improved.
• • Resolved Issues: Known issues from a previous version that have been resolved.
• • Not Applicable: This PR is not to be included in the changelog.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4641   +/-   ##
========================================
  Coverage    92.23%   92.23%           
========================================
  Files          567      567           
  Lines        27953    27953           
========================================
+ Hits         25781    25782    +1     
+ Misses        2172     2171    -1     

see 1 file with indirect coverage changes

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