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Postponed means that the issue was either a feature request or something that requires major refactoring on our side. Since that makes the issue not actionable in the close future we choose to close it as Postponed and add it on our internal roadmaps and technical debt pages instead.

Postponed

Votes

1

Found in

2017.1.1f1

Issue ID

993313

Regression

No

C# compiler constant folding issue with float operations

Scripting

-

To reproduce:

1. Open the project, attached by the tester (ApproximatelyBug.zip)
2. Open the "scene" scene
3. Enter Play mode
4. Observe the console

Expected: Mathf.Approximately ((1.7f - 0.2f) % 1.5f, 0f) returns TRUE as does Mathf.Approximately (1.5f % 1.5f, 0f)
Actual: Mathf.Approximately ((1.7f - 0.2f) % 1.5f, 0f) returns TRUE (should be true), but Mathf.Approximately (1.5f % 1.5f, 0f) returns FALSE

Reproduced in 5.6.5f1, 2017.1.1f1, 2017.2.1p3, 2017.3.0p4, 2018.1.0b5

==========
Resolution:

This is actually a bug in the Mono C# compiler as it evaluates (1.7f - 0.2f) % 1.5f not to the constant value 0 but a very small floating point number. I have filed a bug upstream.

In addition, we plan on migrating to the Roslyn compiler in the future. This bug is not present there. I am resolving this bug for now, either to be fixed by Mono project or by migration to Roslyn.
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