Measure time and yield during GC operations #24
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eduardo-vp
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Mar 17, 2025
* JIT: Introduce `LclVarDsc::lvIsMultiRegDest`
With recent work to expand returned promoted locals into `FIELD_LIST`
the only "whole references" of promoted locals we should see is when
stored from a multi-reg node. This is the only knowledge the backend
should need for correctness purposes, so introduce a bit to track this
property, and switch the backend to check this instead.
The existing `lvIsMultiRegRet` is essentially this + whether the local
is returned. We should be able to remove this, but it is currently used
for some heuristics in old promotion, so keep it around for now.
* JIT: Add some more constant folding in lowering
Add folding for shifts and certain binops that are now getting produced
late due to returned `FIELD_LIST` nodes.
win-arm64 example:
```csharp
[MethodImpl(MethodImplOptions.NoInlining)]
static ValueTask<byte> Foo()
{
return new ValueTask<byte>(123);
}
```
```diff
G_M17084_IG02: ;; offset=0x0008
mov x0, xzr
- mov w1, #1
- mov w2, wzr
- mov w3, dotnet#123
- orr w2, w2, w3, LSL #16
- orr w1, w2, w1, LSL #24
- ;; size=24 bbWeight=1 PerfScore 4.00
+ mov w1, #0x17B0000
+ ;; size=8 bbWeight=1 PerfScore 1.00
```
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