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dotnet / runtime

.NET is a cross-platform runtime for cloud, mobile, desktop, and IoT apps.
https://docs.microsoft.com/dotnet/core/
MIT License
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JIT: Switch memory barrier peephole to be on-demand #91825

Open jakobbotsch opened 1 year ago

jakobbotsch commented 1 year ago

The memory barrier optimization done in appendToCurIG on ARM32/ARM64 looks very expensive throughput wise:

https://github.com/dotnet/runtime/blob/e0a81708fd4f7f57ad85c3d4cffcc3752e5d4046/src/coreclr/jit/emit.cpp#L1518-L1532

We should see if we can switch it to happen on-demand when we are emitting the memory barrier instead.

ghost commented 1 year ago

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Issue Details
The memory barrier optimization done in `appendToCurIG` on ARM32/ARM64 looks very expensive throughput wise: https://github.com/dotnet/runtime/blob/e0a81708fd4f7f57ad85c3d4cffcc3752e5d4046/src/coreclr/jit/emit.cpp#L1518-L1532 We should see if we can switch it to happen on-demand when we are emitting the memory barrier instead.
Author: jakobbotsch
Assignees: -
Labels: `area-CodeGen-coreclr`
Milestone: -