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JIT: Fully share helper-based suspension tails#126360

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jakobbotsch wants to merge 1 commit intodotnet:mainfrom
jakobbotsch:fully-share-suspension-tails
Open

JIT: Fully share helper-based suspension tails#126360
jakobbotsch wants to merge 1 commit intodotnet:mainfrom
jakobbotsch:fully-share-suspension-tails

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@jakobbotsch jakobbotsch commented Mar 31, 2026 •
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When multiple awaits have common context handling logic during suspension we can share that logic completely by jumping to a common block. This PR implements that size optimization.

private static async Task Foo()
{
    await Bar();
    await Bar();

    await Bar().ConfigureAwait(false);
    await Bar().ConfigureAwait(false);
}
Codegen diff 
@@ -11,10 +11,10 @@
 ; 1 inlinees with PGO data; 3 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
-;  V00 AsyncCont    [V00,T01] ( 17,  4   )     ref  ->  [rbp+0x10]  EH-live single-def "Async continuation arg"
+;  V00 AsyncCont    [V00,T01] ( 15,  4   )     ref  ->  [rbp+0x10]  EH-live single-def "Async continuation arg"
 ;  V01 OutArgs      [V01    ] (  1,  1   )  struct (48) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace" <UNNAMED>
-;  V02 tmp1         [V02,T07] (  8,  0   )     ref  ->  [rbp-0x10]  must-init ld-addr-op EH-live single-def "Async ExecutionContext"
-;  V03 tmp2         [V03,T08] (  8,  0   )     ref  ->  [rbp-0x18]  must-init ld-addr-op EH-live single-def "Async SynchronizationContext"
+;  V02 tmp1         [V02,T07] (  6,  0   )     ref  ->  [rbp-0x10]  must-init ld-addr-op EH-live single-def "Async ExecutionContext"
+;  V03 tmp2         [V03,T08] (  6,  0   )     ref  ->  [rbp-0x18]  must-init ld-addr-op EH-live single-def "Async SynchronizationContext"
 ;  V04 tmp3         [V04,T05] (  3,  3   )     ref  ->  rax         class-hnd exact single-def "Inline stloc first use temp" <System.Threading.Thread>
 ;* V05 tmp4         [V05    ] (  0,  0   )   ubyte  ->  zero-ref    "Inlining Arg"
 ;  V06 tmp5         [V06,T09] (  5,  0   )     ref  ->  rbx         class-hnd exact single-def "Inline stloc first use temp" <System.Threading.Thread>
@@ -24,7 +24,7 @@
 ;  V10 rat0         [V10,T04] (  3,  4   )   byref  ->  rax         "TLS field access"
 ;  V11 rat1         [V11,T03] (  3,  6   )    long  ->  rax         "TLS access"
 ;  V12 rat2         [V12,T02] (  3,  6   )   byref  ->  rax         "ThreadStaticBlockBase access"
-;  V13 rat3         [V13,T06] ( 30,  0   )     ref  ->  rbx         "new continuation"
+;  V13 rat3         [V13,T06] ( 26,  0   )     ref  ->  rbx         "new continuation"
 ;  V14 rat4         [V14,T00] ( 15,  8   )     ref  ->  rcx         "returned continuation"
 ;  V15 rat5         [V15,T11] (  3,  0   )     int  ->  rax         "ReplaceWithLclVar is creating a new local variable"
 ;
@@ -42,7 +42,7 @@ G_M44929_IG01:  ;; offset=0x0000
 						;; size=25 bbWeight=1 PerfScore 6.00
 G_M44929_IG02:  ;; offset=0x0019
        test     rcx, rcx
-       jne      G_M44929_IG26
+       jne      G_M44929_IG28
        mov      rax, qword ptr GS:[0x0058]
        mov      rax, qword ptr [rax+0x28]
        cmp      dword ptr [rax+0x250], 2
@@ -54,8 +54,8 @@ G_M44929_IG02:  ;; offset=0x0019
 						;; size=47 bbWeight=1 PerfScore 13.50
 G_M44929_IG03:  ;; offset=0x0048
        mov      rax, gword ptr [rax+0x10]
-       mov      r8, gword ptr [rax+0x08]
-       mov      gword ptr [rbp-0x10], r8
+       mov      rdx, gword ptr [rax+0x08]
+       mov      gword ptr [rbp-0x10], rdx
        mov      rdx, gword ptr [rax+0x10]
        mov      gword ptr [rbp-0x18], rdx
 						;; size=20 bbWeight=1 PerfScore 8.00
@@ -122,26 +122,15 @@ G_M44929_IG13:  ;; offset=0x00E0
        jmp      SHORT G_M44929_IG09
 						;; size=24 bbWeight=0 PerfScore 0.00
 G_M44929_IG14:  ;; offset=0x00F8
-       mov      rdx, 0x7FFAEE674518      ; Continuation_16_0_2
+       mov      rdx, 0x7FFAEE504518      ; Continuation_16_0_2
        call     CORINFO_HELP_ALLOC_CONTINUATION
        mov      rbx, rax
        lea      rcx, [reloc @RWD00]
        mov      qword ptr [rbx+0x10], rcx
        mov      qword ptr [rbx+0x18], 32
-       mov      r8, gword ptr [rbp-0x10]
-       mov      gword ptr [rsp+0x20], r8
-       mov      rdx, gword ptr [rbp-0x18]
-       mov      gword ptr [rsp+0x28], rdx
-       lea      rcx, bword ptr [rbx+0x20]
-       lea      rdx, bword ptr [rbx+0x18]
-       lea      r8, bword ptr [rbx+0x28]
-       cmp      gword ptr [rbp+0x10], 0
-       setne    r9b
-       movzx    r9, r9b
-       call     [System.Runtime.CompilerServices.AsyncHelpers:FinishSuspensionWithContinuationContext(byref,byref,byref,bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
        jmp      G_M44929_IG24
-						;; size=91 bbWeight=0 PerfScore 0.00
-G_M44929_IG15:  ;; offset=0x0153
+						;; size=42 bbWeight=0 PerfScore 0.00
+G_M44929_IG15:  ;; offset=0x0122
        mov      rax, gword ptr [rbp+0x10]
        mov      rbx, rax
        test     rbx, rbx
@@ -151,30 +140,19 @@ G_M44929_IG15:  ;; offset=0x0153
        call     CORINFO_HELP_ASSIGN_REF
        jmp      SHORT G_M44929_IG17
 						;; size=26 bbWeight=0 PerfScore 0.00
-G_M44929_IG16:  ;; offset=0x016D
-       mov      rdx, 0x7FFAEE674518      ; Continuation_16_0_2
+G_M44929_IG16:  ;; offset=0x013C
+       mov      rdx, 0x7FFAEE504518      ; Continuation_16_0_2
        call     CORINFO_HELP_ALLOC_CONTINUATION
        mov      rbx, rax
 						;; size=18 bbWeight=0 PerfScore 0.00
-G_M44929_IG17:  ;; offset=0x017F
+G_M44929_IG17:  ;; offset=0x014E
        lea      rcx, [reloc @RWD16]
        mov      qword ptr [rbx+0x10], rcx
        mov      rcx, 0x100000020
        mov      qword ptr [rbx+0x18], rcx
-       mov      r8, gword ptr [rbp-0x10]
-       mov      gword ptr [rsp+0x20], r8
-       mov      rdx, gword ptr [rbp-0x18]
-       mov      gword ptr [rsp+0x28], rdx
-       lea      rcx, bword ptr [rbx+0x20]
-       lea      rdx, bword ptr [rbx+0x18]
-       lea      r8, bword ptr [rbx+0x28]
-       cmp      gword ptr [rbp+0x10], 0
-       setne    r9b
-       movzx    r9, r9b
-       call     [System.Runtime.CompilerServices.AsyncHelpers:FinishSuspensionWithContinuationContext(byref,byref,byref,bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
        jmp      G_M44929_IG24
-						;; size=79 bbWeight=0 PerfScore 0.00
-G_M44929_IG18:  ;; offset=0x01CE
+						;; size=30 bbWeight=0 PerfScore 0.00
+G_M44929_IG18:  ;; offset=0x016C
        mov      rax, gword ptr [rbp+0x10]
        mov      rbx, rax
        test     rbx, rbx
@@ -184,26 +162,19 @@ G_M44929_IG18:  ;; offset=0x01CE
        call     CORINFO_HELP_ASSIGN_REF
        jmp      SHORT G_M44929_IG20
 						;; size=26 bbWeight=0 PerfScore 0.00
-G_M44929_IG19:  ;; offset=0x01E8
-       mov      rdx, 0x7FFAEE674518      ; Continuation_16_0_2
+G_M44929_IG19:  ;; offset=0x0186
+       mov      rdx, 0x7FFAEE504518      ; Continuation_16_0_2
        call     CORINFO_HELP_ALLOC_CONTINUATION
        mov      rbx, rax
 						;; size=18 bbWeight=0 PerfScore 0.00
-G_M44929_IG20:  ;; offset=0x01FA
+G_M44929_IG20:  ;; offset=0x0198
        lea      rcx, [reloc @RWD32]
        mov      qword ptr [rbx+0x10], rcx
        mov      rcx, 0x200000001
        mov      qword ptr [rbx+0x18], rcx
-       lea      rcx, bword ptr [rbx+0x28]
-       cmp      gword ptr [rbp+0x10], 0
-       setne    dl
-       movzx    rdx, dl
-       mov      r8, gword ptr [rbp-0x10]
-       mov      r9, gword ptr [rbp-0x18]
-       call     [System.Runtime.CompilerServices.AsyncHelpers:FinishSuspensionNoContinuationContext(byref,bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
-       jmp      SHORT G_M44929_IG24
-						;; size=56 bbWeight=0 PerfScore 0.00
-G_M44929_IG21:  ;; offset=0x0232
+       jmp      SHORT G_M44929_IG25
+						;; size=27 bbWeight=0 PerfScore 0.00
+G_M44929_IG21:  ;; offset=0x01B3
        mov      rax, gword ptr [rbp+0x10]
        mov      rbx, rax
        test     rbx, rbx
@@ -213,16 +184,33 @@ G_M44929_IG21:  ;; offset=0x0232
        call     CORINFO_HELP_ASSIGN_REF
        jmp      SHORT G_M44929_IG23
 						;; size=26 bbWeight=0 PerfScore 0.00
-G_M44929_IG22:  ;; offset=0x024C
-       mov      rdx, 0x7FFAEE674518      ; Continuation_16_0_2
+G_M44929_IG22:  ;; offset=0x01CD
+       mov      rdx, 0x7FFAEE504518      ; Continuation_16_0_2
        call     CORINFO_HELP_ALLOC_CONTINUATION
        mov      rbx, rax
 						;; size=18 bbWeight=0 PerfScore 0.00
-G_M44929_IG23:  ;; offset=0x025E
+G_M44929_IG23:  ;; offset=0x01DF
        lea      rcx, [reloc @RWD48]
        mov      qword ptr [rbx+0x10], rcx
        mov      rcx, 0x300000001
        mov      qword ptr [rbx+0x18], rcx
+       jmp      SHORT G_M44929_IG25
+						;; size=27 bbWeight=0 PerfScore 0.00
+G_M44929_IG24:  ;; offset=0x01FA
+       mov      r8, gword ptr [rbp-0x10]
+       mov      gword ptr [rsp+0x20], r8
+       mov      rdx, gword ptr [rbp-0x18]
+       mov      gword ptr [rsp+0x28], rdx
+       lea      rcx, bword ptr [rbx+0x20]
+       lea      rdx, bword ptr [rbx+0x18]
+       lea      r8, bword ptr [rbx+0x28]
+       cmp      gword ptr [rbp+0x10], 0
+       setne    r9b
+       movzx    r9, r9b
+       call     [System.Runtime.CompilerServices.AsyncHelpers:FinishSuspensionWithContinuationContext(byref,byref,byref,bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
+       jmp      SHORT G_M44929_IG26
+						;; size=51 bbWeight=0 PerfScore 0.00
+G_M44929_IG25:  ;; offset=0x022D
        lea      rcx, bword ptr [rbx+0x28]
        cmp      gword ptr [rbp+0x10], 0
        setne    dl
@@ -230,51 +218,51 @@ G_M44929_IG23:  ;; offset=0x025E
        mov      r8, gword ptr [rbp-0x10]
        mov      r9, gword ptr [rbp-0x18]
        call     [System.Runtime.CompilerServices.AsyncHelpers:FinishSuspensionNoContinuationContext(byref,bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
-						;; size=54 bbWeight=0 PerfScore 0.00
-G_M44929_IG24:  ;; offset=0x0294
+						;; size=29 bbWeight=0 PerfScore 0.00
+G_M44929_IG26:  ;; offset=0x024A
        mov      rcx, rbx
 						;; size=3 bbWeight=0 PerfScore 0.00
-G_M44929_IG25:  ;; offset=0x0297
+G_M44929_IG27:  ;; offset=0x024D
        add      rsp, 72
        pop      rbx
        pop      rbp
        ret      
 						;; size=7 bbWeight=0 PerfScore 0.00
-G_M44929_IG26:  ;; offset=0x029E
+G_M44929_IG28:  ;; offset=0x0254
        mov      rcx, gword ptr [rbp+0x10]
        mov      eax, dword ptr [rcx+0x1C]
        cmp      eax, 3
-       ja       SHORT G_M44929_IG27
+       ja       SHORT G_M44929_IG29
        lea      rdx, [reloc @RWD64]
        mov      edx, dword ptr [rdx+4*rax]
        lea      r8, G_M44929_IG02
        add      rdx, r8
        jmp      rdx
 						;; size=34 bbWeight=0 PerfScore 0.00
-G_M44929_IG27:  ;; offset=0x02C0
+G_M44929_IG29:  ;; offset=0x0276
        mov      rcx, gword ptr [rcx+0x28]
        call     [System.Runtime.CompilerServices.AsyncHelpers:RestoreExecutionContext(System.Threading.ExecutionContext)]
        jmp      G_M44929_IG05
 						;; size=15 bbWeight=0 PerfScore 0.00
-G_M44929_IG28:  ;; offset=0x02CF
+G_M44929_IG30:  ;; offset=0x0285
        mov      rcx, gword ptr [rcx+0x28]
        call     [System.Runtime.CompilerServices.AsyncHelpers:RestoreExecutionContext(System.Threading.ExecutionContext)]
        jmp      G_M44929_IG06
 						;; size=15 bbWeight=0 PerfScore 0.00
-G_M44929_IG29:  ;; offset=0x02DE
+G_M44929_IG31:  ;; offset=0x0294
        mov      rcx, gword ptr [rcx+0x28]
        call     [System.Runtime.CompilerServices.AsyncHelpers:RestoreExecutionContext(System.Threading.ExecutionContext)]
        jmp      G_M44929_IG07
 						;; size=15 bbWeight=0 PerfScore 0.00
-G_M44929_IG30:  ;; offset=0x02ED
+G_M44929_IG32:  ;; offset=0x02A3
        mov      rcx, gword ptr [rcx+0x28]
        call     [System.Runtime.CompilerServices.AsyncHelpers:RestoreExecutionContext(System.Threading.ExecutionContext)]
        jmp      G_M44929_IG08
 						;; size=15 bbWeight=0 PerfScore 0.00
-G_M44929_IG31:  ;; offset=0x02FC
+G_M44929_IG33:  ;; offset=0x02B2
        sub      rsp, 56
 						;; size=4 bbWeight=0 PerfScore 0.00
-G_M44929_IG32:  ;; offset=0x0300
+G_M44929_IG34:  ;; offset=0x02B6
        cmp      gword ptr [rbp+0x10], 0
        setne    cl
        movzx    rcx, cl
@@ -283,7 +271,7 @@ G_M44929_IG32:  ;; offset=0x0300
        call     [System.Runtime.CompilerServices.AsyncHelpers:RestoreContexts(bool,System.Threading.ExecutionContext,System.Threading.SynchronizationContext)]
        nop      
 						;; size=26 bbWeight=0 PerfScore 0.00
-G_M44929_IG33:  ;; offset=0x031A
+G_M44929_IG35:  ;; offset=0x02D0
        add      rsp, 56
        ret      
 						;; size=5 bbWeight=0 PerfScore 0.00
@@ -295,12 +283,12 @@ RWD32  	dq	(dynamicClass):IL_STUB_AsyncResume(System.Object,byref):System.Object
 	dq	G_M44929_IG18
 RWD48  	dq	(dynamicClass):IL_STUB_AsyncResume(System.Object,byref):System.Object
 	dq	G_M44929_IG21
-RWD64  	dd	000002A7h ; case G_M44929_IG27
-       	dd	000002B6h ; case G_M44929_IG28
-       	dd	000002C5h ; case G_M44929_IG29
-       	dd	000002D4h ; case G_M44929_IG30
+RWD64  	dd	0000025Dh ; case G_M44929_IG29
+       	dd	0000026Ch ; case G_M44929_IG30
+       	dd	0000027Bh ; case G_M44929_IG31
+       	dd	0000028Ah ; case G_M44929_IG32
 
 
-; Total bytes of code 799, prolog size 25, PerfScore 51.00, instruction count 191, allocated bytes for code 799 (MethodHash=967d507e) for method AsyncMicro.Program:Foo() (Tier1)
+; Total bytes of code 725, prolog size 25, PerfScore 51.00, instruction count 175, allocated bytes for code 725 (MethodHash=967d507e) for method AsyncMicro.Program:Foo() (Tier1)
 ; ============================================================
NativeAOT Test size diffs
BaseSize DiffSize Delta Percent Name
16,573,440 16,499,712 -73,728 -0.445% System.Linq.AsyncEnumerable.Tests.exe
31,153,664 31,025,152 -128,512 -0.413% System.Net.Http.Functional.Tests.exe
115,722,240 115,256,320 -465,920 -0.403% System.Text.Json.SourceGeneration.Roslyn4.4.Tests.exe
19,599,872 19,547,136 -52,736 -0.269% System.IO.Compression.Tests.exe
20,982,784 20,930,560 -52,224 -0.249% System.Net.Quic.Functional.Tests.exe
20,066,304 20,021,248 -45,056 -0.225% System.Formats.Tar.Tests.exe
10,061,824 10,043,392 -18,432 -0.183% System.IO.Compression.ZipFile.Tests.exe
16,796,672 16,766,976 -29,696 -0.177% System.Xml.Linq.Misc.Tests.exe
14,916,096 14,889,984 -26,112 -0.175% System.Xml.Linq.Streaming.Tests.exe
16,529,920 16,503,808 -26,112 -0.158% System.Xml.Linq.Events.Tests.exe
17,079,296 17,052,672 -26,624 -0.156% System.Xml.Linq.xNodeBuilder.Tests.exe
17,022,464 16,996,352 -26,112 -0.153% System.Xml.Linq.xNodeReader.Tests.exe
16,685,568 16,659,968 -25,600 -0.153% System.Xml.Linq.Properties.Tests.exe
17,138,176 17,112,576 -25,600 -0.149% System.Xml.Linq.TreeManipulation.Tests.exe
10,663,424 10,648,576 -14,848 -0.139% System.IO.Pipelines.Tests.exe
22,751,232 22,721,024 -30,208 -0.133% System.Net.Sockets.Tests.exe
20,016,128 19,991,040 -25,088 -0.125% System.Net.WebSockets.Client.Tests.exe
28,812,800 28,776,960 -35,840 -0.124% System.Net.Http.WinHttpHandler.Functional.Tests.exe
20,276,736 20,254,208 -22,528 -0.111% System.Threading.Tasks.Dataflow.Tests.exe
19,061,248 19,040,768 -20,480 -0.107% System.Net.HttpListener.Tests.exe
17,734,144 17,716,224 -17,920 -0.101% System.Threading.Tasks.Extensions.Tests.exe
13,243,904 13,231,104 -12,800 -0.097% System.IO.Packaging.Tests.exe
33,183,744 33,152,000 -31,744 -0.096% System.Private.Xml.Tests.exe
21,716,480 21,696,512 -19,968 -0.092% System.IO.FileSystem.Tests.exe
11,991,040 11,980,288 -10,752 -0.090% System.IO.Tests.exe
10,275,840 10,266,624 -9,216 -0.090% System.Threading.Channels.Tests.exe
13,869,056 13,856,768 -12,288 -0.089% Microsoft.Extensions.Configuration.Functional.Tests.exe
14,570,496 14,557,696 -12,800 -0.088% System.Net.WebClient.Tests.exe
12,415,488 12,404,736 -10,752 -0.087% System.Xml.Linq.SDMSample.Tests.exe
17,569,280 17,554,432 -14,848 -0.085% MetricOuterLoop.Tests.exe
12,848,128 12,837,376 -10,752 -0.084% System.Xml.Schema.Extensions.Tests.exe
17,573,888 17,560,064 -13,824 -0.079% MetricOuterLoop1.Tests.exe
27,902,976 27,880,960 -22,016 -0.079% System.Net.Security.Tests.exe
17,792,512 17,778,688 -13,824 -0.078% System.Formats.Tar.Manual.Tests.exe
15,759,872 15,747,584 -12,288 -0.078% System.Windows.Extensions.Tests.exe
13,941,248 13,930,496 -10,752 -0.077% Microsoft.Extensions.Configuration.Xml.Tests.exe
19,547,136 19,532,288 -14,848 -0.076% System.Diagnostics.Process.Tests.exe
10,051,072 10,043,392 -7,680 -0.076% System.Net.ServerSentEvents.Tests.exe
14,128,640 14,117,888 -10,752 -0.076% System.DirectoryServices.Protocols.Tests.exe
15,100,416 15,089,152 -11,264 -0.075% System.Drawing.Primitives.Tests.exe
18,449,920 18,436,096 -13,824 -0.075% System.Threading.Tasks.Parallel.Tests.exe
21,093,376 21,077,504 -15,872 -0.075% System.Net.Requests.Tests.exe
9,726,464 9,719,296 -7,168 -0.074% System.Threading.RateLimiting.Tests.exe
19,291,648 19,277,312 -14,336 -0.074% System.IO.Pipes.Tests.exe
17,432,064 17,419,264 -12,800 -0.073% System.Net.Ping.Functional.Tests.exe
17,329,664 17,317,376 -12,288 -0.071% System.Threading.Timer.Tests.exe
17,288,704 17,276,416 -12,288 -0.071% System.Runtime.InteropServices.RuntimeInformation.Tests.exe
18,775,040 18,761,728 -13,312 -0.071% Microsoft.Extensions.FileProviders.Physical.Tests.exe
17,361,408 17,349,120 -12,288 -0.071% System.Diagnostics.StackTrace.Tests.exe
17,214,976 17,202,688 -12,288 -0.071% System.Net.ServicePoint.Tests.exe
15,078,400 15,067,648 -10,752 -0.071% System.Security.Cryptography.Cng.Tests.exe
20,542,464 20,528,128 -14,336 -0.070% System.Threading.Tasks.Tests.exe
18,381,824 18,369,024 -12,800 -0.070% Microsoft.Extensions.Primitives.Tests.exe
18,492,928 18,480,128 -12,800 -0.069% Microsoft.Extensions.Configuration.Tests.exe
18,455,040 18,442,240 -12,800 -0.069% Microsoft.Extensions.Configuration.FileExtensions.Tests.exe
17,154,048 17,142,272 -11,776 -0.069% IcuAppLocal.Tests.exe
15,036,928 15,026,688 -10,240 -0.068% System.Data.DataSetExtensions.Tests.exe
18,063,360 18,051,072 -12,288 -0.068% System.Console.Tests.exe
17,430,528 17,418,752 -11,776 -0.068% System.Diagnostics.TraceSource.Tests.exe
17,311,744 17,299,968 -11,776 -0.068% System.Security.Principal.Windows.Tests.exe
11,270,144 11,262,464 -7,680 -0.068% System.IO.Compression.Brotli.Tests.exe
17,967,104 17,954,816 -12,288 -0.068% System.Threading.ThreadPool.Tests.exe
17,235,456 17,223,680 -11,776 -0.068% System.Runtime.InvariantTimezone.Tests.exe
17,230,336 17,218,560 -11,776 -0.068% System.ComponentModel.EventBasedAsync.Tests.exe
11,327,488 11,319,808 -7,680 -0.068% System.Net.WebSockets.Tests.exe
17,298,432 17,286,656 -11,776 -0.068% System.Security.Claims.Tests.exe
17,616,384 17,604,608 -11,776 -0.067% System.Threading.Thread.Tests.exe
17,660,928 17,649,152 -11,776 -0.067% System.IO.FileSystem.Watcher.Tests.exe
17,657,344 17,645,568 -11,776 -0.067% System.Buffers.Tests.exe
16,105,984 16,095,232 -10,752 -0.067% System.Data.Odbc.Tests.exe
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Copilot AI review requested due to automatic review settings March 31, 2026 16:24
@github-actions github-actions Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 31, 2026
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
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Pull request overview

This PR extends the CoreCLR async-await JIT transformation to further reduce generated code size by fully sharing the “finish suspension” tail logic (context capture/restore + return-suspend) across multiple awaits via shared blocks, leveraging the helper-based suspension helpers added previously.

Changes:

  • Adds two new AsyncHelpers “finish suspension” helpers to the JIT/EE async interface (CORINFO_ASYNC_INFO) and wires them through VM, SuperPMI, and JIT interface tooling.
  • Updates the JIT async transformation to optionally route multiple suspension epilogs through shared “finish context handling” blocks (separately for with/without continuation-context capture).
  • Exposes ExecutionContext.InstanceIsFlowSuppressed to support the new helpers’ flow-suppressed handling logic.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file
File Description
src/libraries/System.Private.CoreLib/src/System/Threading/ExecutionContext.cs Adds internal instance accessor for flow-suppressed state used by new suspension helpers.
src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.CoreCLR.cs Adds FinishSuspension* helper implementations used by JIT-generated suspension tails.
src/coreclr/inc/corinfo.h Extends CORINFO_ASYNC_INFO with method handles for the new finish-suspension helpers.
src/coreclr/vm/corelib.h Adds CoreLib binder entries for the new AsyncHelpers methods.
src/coreclr/vm/jitinterface.cpp Populates the new helper method handles in CEEInfo::getAsyncInfo.
src/coreclr/jit/async.h Adds helper selection and accounting types + fields for shared finish-context-handling blocks.
src/coreclr/jit/async.cpp Implements shared finish-suspension block creation and reroutes suspension epilogs to shared blocks when beneficial.
src/coreclr/jit/gentree.h Adds a hook for “needs execution context save/restore” used by the async transformation logic.
src/coreclr/inc/jiteeversionguid.h Bumps JIT/EE version GUID to reflect the interface change.
src/coreclr/tools/superpmi/superpmi-shared/agnostic.h Updates SuperPMI agnostic async info struct to include the new method handles.
src/coreclr/tools/superpmi/superpmi-shared/methodcontext.cpp Records/replays the new async helper handles for SuperPMI.
src/coreclr/tools/Common/JitInterface/CorInfoTypes.cs Updates managed projection of CORINFO_ASYNC_INFO.
src/coreclr/tools/Common/JitInterface/CorInfoImpl.cs Provides the new helper method handles to the managed JIT interface implementation.
src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/ReadyToRunCodegenCompilation.cs Ensures R2R compilation includes references to the new AsyncHelpers methods.
src/coreclr/tools/aot/ILCompiler.Compiler/IL/ILImporter.Scanner.cs Adds dependency scanning for the new AsyncHelpers methods.

Comment thread src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.CoreCLR.cs Outdated
Comment thread src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.CoreCLR.cs Outdated
This was referenced Apr 1, 2026
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@jakobbotsch jakobbotsch force-pushed the fully-share-suspension-tails branch from 79d9b7e to 96b408c Compare April 28, 2026 09:55
Copilot AI review requested due to automatic review settings April 28, 2026 10:15
@jakobbotsch jakobbotsch force-pushed the fully-share-suspension-tails branch from 96b408c to b8e698f Compare April 28, 2026 10:15
Copilot AI reviewed Apr 28, 2026
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Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

Comment thread src/coreclr/jit/async.cpp Outdated
Comment thread src/coreclr/jit/async.cpp
Comment thread src/coreclr/jit/async.cpp
Comment thread src/coreclr/inc/jiteeversionguid.h Outdated
@jakobbotsch jakobbotsch force-pushed the fully-share-suspension-tails branch from b8e698f to 8cba3d6 Compare April 28, 2026 10:28
Copilot AI review requested due to automatic review settings April 28, 2026 10:28
@jakobbotsch jakobbotsch force-pushed the fully-share-suspension-tails branch from 8cba3d6 to 6415139 Compare April 28, 2026 10:28
@jakobbotsch
JIT: Fully share helper-based suspension tails
dba203d 
When multiple awaits have common context handling logic during
suspension we can share that logic completely by jumping to a common
block. This PR implements that size optimization.
@jakobbotsch jakobbotsch force-pushed the fully-share-suspension-tails branch from 6415139 to dba203d Compare April 28, 2026 10:31
Copilot AI reviewed Apr 28, 2026
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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

Comment thread src/coreclr/jit/gentree.h
Comment thread src/coreclr/jit/async.cpp
Comment thread src/coreclr/jit/async.cpp
Comment thread src/coreclr/jit/async.cpp
@jakobbotsch jakobbotsch marked this pull request as ready for review April 28, 2026 15:49
This was referenced Apr 28, 2026
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