[wasm] Bump chrome for testing - linux: 119.0.6045.159, windows: 119.0.6045.160 #16
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adamsitnik
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that referenced
this pull request
Apr 3, 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 dotnet#24
- ;; size=24 bbWeight=1 PerfScore 4.00
+ mov w1, #0x17B0000
+ ;; size=8 bbWeight=1 PerfScore 1.00
```
* Feedback
MihaZupan
pushed a commit
that referenced
this pull request
Jun 11, 2025
Add support using bitwise operations to reconstruct registers passed
into calls from multiple promoted fields. Remove the IR invariant that
`FIELD_LIST` args must always map cleanly to registers; instead, any
`FIELD_LIST` is allowed for register-only arguments before lowering, and
lowering takes care to normalize them into a handled shape.
`fgTryMorphStructArg` is changed to take advantage of this by now
producing `FIELD_LIST` even when a promoted arg does not match the
target ABI. Support in physical promotion will be added in a follow up.
Split arguments are not handled and retain the old IR invariant of
requiring registers and stack slots to make cleanly from `FIELD_LIST`.
win-x64 examples:
```csharp
static void Foo(int x)
{
Use<int?>(x);
Use<int?>(5);
Use<int?>(null);
}
```
```diff
G_M7200_IG02: ;; offset=0x0004
- mov byte ptr [rsp+0x20], 1
- mov dword ptr [rsp+0x24], ecx
- mov rcx, qword ptr [rsp+0x20]
+ mov ecx, ecx
+ shl rcx, 32
+ or rcx, 1
call [Program:Bar(System.Nullable`1[int])]
- mov dword ptr [rsp+0x24], 5
- mov rcx, qword ptr [rsp+0x20]
+ mov rcx, 0x500000001
call [Program:Bar(System.Nullable`1[int])]
- mov byte ptr [rsp+0x20], 0
xor ecx, ecx
- mov dword ptr [rsp+0x24], ecx
- mov rcx, qword ptr [rsp+0x20]
- ;; size=55 bbWeight=1 PerfScore 14.25
+ ;; size=34 bbWeight=1 PerfScore 7.50
G_M7200_IG03:
add rsp, 40
tail.jmp [Program:Bar(System.Nullable`1[int])]
;; size=10 bbWeight=1 PerfScore 2.25
```
```csharp
static void Foo(int x, float y)
{
Use((x, y));
}
```
```diff
G_M42652_IG01: ;; offset=0x0000
- push rax
- ;; size=1 bbWeight=1 PerfScore 1.00
+ ;; size=0 bbWeight=1 PerfScore 0.00
G_M42652_IG02:
- mov dword ptr [rsp], ecx
- vmovss dword ptr [rsp+0x04], xmm1
- mov rcx, qword ptr [rsp]
+ vmovd eax, xmm1
+ shl rax, 32
+ mov ecx, ecx
+ or rcx, rax
;; size=13 bbWeight=1 PerfScore 3.00
G_M42652_IG03:
- add rsp, 8
tail.jmp [Program:Use[System.ValueTuple`2[int,float]](System.ValueTuple`2[int,float])]
```
A win-arm64 example:
```csharp
static void Foo(int[] arr)
{
Use(arr.AsMemory());
}
```
```diff
G_M33990_IG01:
- stp fp, lr, [sp, #-0x20]!
+ stp fp, lr, [sp, #-0x10]!
mov fp, sp
- str xzr, [fp, #0x10] // [V03 tmp2]
- ;; size=12 bbWeight=1 PerfScore 2.50
+ ;; size=8 bbWeight=1 PerfScore 1.50
G_M33990_IG02:
cbz x0, G_M33990_IG04
;; size=4 bbWeight=1 PerfScore 1.00
G_M33990_IG03:
- str x0, [fp, #0x10] // [V07 tmp6]
- str wzr, [fp, #0x18] // [V08 tmp7]
- ldr w0, [x0, #0x08]
- str w0, [fp, #0x1C] // [V09 tmp8]
+ ldr w1, [x0, #0x08]
b G_M33990_IG05
- ;; size=20 bbWeight=0.50 PerfScore 3.50
+ ;; size=8 bbWeight=0.50 PerfScore 2.00
G_M33990_IG04:
- str xzr, [fp, #0x10] // [V07 tmp6]
- str xzr, [fp, #0x18]
- ;; size=8 bbWeight=0.50 PerfScore 1.00
+ mov x0, xzr
+ mov w1, wzr
+ ;; size=8 bbWeight=0.50 PerfScore 0.50
G_M33990_IG05:
- ldp x0, x1, [fp, #0x10] // [V03 tmp2], [V03 tmp2+0x08]
- movz x2, #0xD920 // code for Program:Use[System.Memory`1[int]](System.Memory`1[int])
- movk x2, #0x4590 LSL #16
+ mov w1, w1
+ lsl x1, x1, dotnet#32
+ movz x2, #0xD950 // code for Program:Use[System.Memory`1[int]](System.Memory`1[int])
+ movk x2, #0x4592 LSL #16
movk x2, #0x7FFE LSL dotnet#32
ldr x2, [x2]
- ;; size=20 bbWeight=1 PerfScore 7.50
+ ;; size=24 bbWeight=1 PerfScore 6.00
G_M33990_IG06:
- ldp fp, lr, [sp], #0x20
+ ldp fp, lr, [sp], #0x10
br x2
;; size=8 bbWeight=1 PerfScore 2.00
-; Total bytes of code: 72
+; Total bytes of code: 60
```
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