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Tweak explanation of loop countdown JIT optimization #43141

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gewarren merged 1 commit into from
Oct 21, 2024
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Tweak explanation of loop countdown JIT optimization #43141

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2 changes: 1 addition & 1 deletion docs/core/whats-new/dotnet-9/runtime.md
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Expand Up @@ -175,7 +175,7 @@ In .NET 9, the JIT compiler *automatically* transforms the first indexing patter

#### Loop counter variable direction

The 64-bit compiler now recognizes when the direction of a loop's counter variable can be flipped without affecting the program's behavior, and then performs the transformation.
The 64-bit compiler now recognizes when a loop's counter variable is used only to control the number of iterations, and transforms the loop to count down instead of up.

In the idiomatic `for (int i = ...)` pattern, the counter variable typically increases. Consider the following example:

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