Implement more float & parametric instructions.

[twitchyliquid64]

No description provided.

[codecov-io]

Codecov Report

Merging #127 into master will decrease coverage by 0.23%.
The diff coverage is 37.26%.

@@            Coverage Diff            @@
##           master    #127      +/-   ##
=========================================
- Coverage   66.74%   66.5%   -0.24%     
=========================================
  Files          41      41              
  Lines        4399    4490      +91     
=========================================
+ Hits         2936    2986      +50     
- Misses       1192    1233      +41     
  Partials      271     271

Impacted Files	Coverage Δ
exec/internal/compile/scanner.go	0% <0%> (ø)	⬆️
exec/internal/compile/backend_amd64.go	77.02% <40.26%> (-1.73%)	⬇️

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