[Rafael-SOWNet]

Compiled over double, 1/x at 0 was +Infinity, where evaluation, FastExpression and the compiler over Complex all say NaN. The compiler emitted the IEEE quotient. Math.Pow likewise made 0^(-1) an infinity and 0^0 equal to 1, where evaluation makes both NaN.

A division over double or float now calls MathAllMethods.Divide, which answers a zero divisor with NaN, and Pow answers 0 raised to a power that is not positive with NaN. A compiled matrix argument divided by a scalar now does the same, entry by entry.

Input	2.6.0 and master	Now
"1/x".Compile<double, double>("x")(0)	+Infinity	NaN
"x^(-1)".Compile<double, double>("x")(0)	+Infinity	NaN
"x^x".Compile<double, double>("x")(0)	1	NaN
"A / x", a matrix A at x = 0	+Infinity entries	NaN entries

DivisionByZeroOverDoubleTest: the seven scalar cases fail on master, and the matrix case fails with master's TensorCompilation. The suite (18,286), the trio, F#, AOT and the eight harnesses pass locally. work/compilesweep found 19 of these in 3000 random compositions.

This leaves the other half of #2286 open: the 60 expressions with a real value and a non-real intermediate, which the double compiler gives as NaN. That is a question for the maintainer. Also found while testing, and filed as #2287: compiled x / A, with a matrix argument, divides entry by entry where evaluation multiplies by the inverse.

Part of #2286.

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[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.72%. Comparing base (6d2a960) to head (13545a3).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...h/Functions/Compilation/IntoLinq/MathAllMethods.cs	66.66%	2 Missing ⚠️
...unctions/Compilation/IntoLinq/TensorCompilation.cs	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2288      +/-   ##
==========================================
+ Coverage   86.71%   86.72%   +0.01%     
==========================================
  Files         310      310              
  Lines       67849    67861      +12     
  Branches    19690    19696       +6     
==========================================
+ Hits        58836    58854      +18     
+ Misses       4894     4886       -8     
- Partials     4119     4121       +2     

Flag	Coverage Δ
cpp	37.77% <ø> (ø)
csharp	87.27% <69.23%> (+0.01%)	⬆️
fsharp	32.97% <ø> (ø)
interactive	40.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ctions/Compilation/IntoLinq/CompilationProtocol.cs	93.52% <100.00%> (+0.07%)	⬆️
...h/Functions/Compilation/IntoLinq/MathAllMethods.cs	74.24% <66.66%> (+0.26%)	⬆️
...unctions/Compilation/IntoLinq/TensorCompilation.cs	49.29% <0.00%> (+1.40%)	⬆️

... and 7 files with indirect coverage changes

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