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TensorPrimitives.IndexOfMaxMagnitude can't handle signed min values #127610
Description
Description
Current implementation of TensorPrimitives.IndexOfMaxMagnitude (and IndexOfMinMagnitude) does not handle signed minimum values (e.g. int.MinValue) since the Abs operator is overflowing.
Reproduction Steps
var len = 500;
var x = new int[len];
x[0] = int.MinValue;
x[^1] = int.MinValue;
var i = TensorPrimitives.IndexOfMaxMagnitude(x);
Console.WriteLine(i);
Expected behavior
Should print 0
Actual behavior
Either gives wrong answer (1) when on vectorized path and throws OverflowException on non-vectorized path.
Regression?
No
Known Workarounds
No response
Configuration
.NET 10 and .NET 11
Other information
No response
Activity
dotnet-policy-service commentedon Apr 30, 2026
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Fix TensorPrimitives.IndexOfMax (dotnet#127454)
Fix TensorPrimitives.IndexOfMax (#127454)