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Regressions in System.Buffers.Binary.Tests.BinaryReadAndWriteTests #85988

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performanceautofiler bot opened this issue May 9, 2023 · 12 comments
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arch-x64 area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI os-windows runtime-coreclr specific to the CoreCLR runtime
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@performanceautofiler
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performanceautofiler bot commented May 9, 2023

Run Information

Name Value
Architecture x64
OS Windows 10.0.18362
Queue TigerWindows
Baseline 442141d696ee7d4ae54420974559e99738d753e6
Compare c8f43d52f699c1da289a5cb36d371aec15901ab8
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Buffers.Binary.Tests.BinaryReadAndWriteTests

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
MeasureReverseUsingNtoH - Duration of single invocation 605.61 ns 946.10 ns 1.56 0.01 True 6022.827101520892 8089.7074446351235 1.3431744442061604) Trace Trace
MeasureReverseEndianness - Duration of single invocation 614.26 ns 941.83 ns 1.53 0.00 True 6056.527359489527 8075.261900385958 1.333315515818388) Trace Trace

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Binary.Tests.BinaryReadAndWriteTests*'

Payloads

Baseline
Compare

Histogram

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseUsingNtoH


Description of detection logic

IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 946.1020211179717 > 643.259435520526.
IsChangePoint: Marked as a change because one of 5/3/2023 7:05:50 AM, 5/9/2023 7:24:34 AM falls between 4/30/2023 6:17:41 PM and 5/9/2023 7:24:34 AM.
IsRegressionStdDev: Marked as regression because -145.33095665139552 (T) = (0 -943.5256872067196) / Math.Sqrt((100.76093042903165 / (21)) + (1.9921542971535473 / (13))) is less than -2.03693334345674 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (13) - 2, .025) and -0.5214730941818898 = (620.1395810512588 - 943.5256872067196) / 620.1395810512588 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

JIT Disasms

Baseline
Compare
Diff

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseEndianness


Description of detection logic

IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 941.8282251056002 > 645.1990668248882.
IsChangePoint: Marked as a change because one of 5/3/2023 7:05:50 AM, 5/9/2023 7:24:34 AM falls between 4/30/2023 6:17:41 PM and 5/9/2023 7:24:34 AM.
IsRegressionStdDev: Marked as regression because -172.69616839909932 (T) = (0 -942.899495537063) / Math.Sqrt((71.28264791595957 / (21)) + (0.9109916109751146 / (13))) is less than -2.03693334345674 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (13) - 2, .025) and -0.5172382205961809 = (621.4577794952738 - 942.899495537063) / 621.4577794952738 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

JIT Disasms

Baseline
Compare
Diff

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

@performanceautofiler performanceautofiler bot added arch-x64 os-windows runtime-coreclr specific to the CoreCLR runtime untriaged New issue has not been triaged by the area owner labels May 9, 2023
@cincuranet cincuranet removed the untriaged New issue has not been triaged by the area owner label May 9, 2023
@cincuranet cincuranet changed the title [Perf] Windows/x64: 2 Regressions on 5/3/2023 1:06:54 PM Regressions in System.Buffers.Binary.Tests.BinaryReadAndWriteTests May 9, 2023
@cincuranet cincuranet transferred this issue from dotnet/perf-autofiling-issues May 9, 2023
@ghost ghost added the untriaged New issue has not been triaged by the area owner label May 9, 2023
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ghost commented May 9, 2023

Tagging subscribers to this area: @dotnet/area-system-buffers
See info in area-owners.md if you want to be subscribed.

Issue Details

Run Information

Name Value
Architecture x64
OS Windows 10.0.18362
Queue TigerWindows
Baseline 442141d696ee7d4ae54420974559e99738d753e6
Compare c8f43d52f699c1da289a5cb36d371aec15901ab8
Diff Diff
Configs CompilationMode:tiered, RunKind:micro

Regressions in System.Buffers.Binary.Tests.BinaryReadAndWriteTests

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
MeasureReverseUsingNtoH - Duration of single invocation 605.61 ns 946.10 ns 1.56 0.01 True 6022.827101520892 8089.7074446351235 1.3431744442061604) Trace Trace
MeasureReverseEndianness - Duration of single invocation 614.26 ns 941.83 ns 1.53 0.00 True 6056.527359489527 8075.261900385958 1.333315515818388) Trace Trace

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Binary.Tests.BinaryReadAndWriteTests*'

Payloads

Baseline
Compare

Histogram

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseUsingNtoH


Description of detection logic

IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 946.1020211179717 > 643.259435520526.
IsChangePoint: Marked as a change because one of 5/3/2023 7:05:50 AM, 5/9/2023 7:24:34 AM falls between 4/30/2023 6:17:41 PM and 5/9/2023 7:24:34 AM.
IsRegressionStdDev: Marked as regression because -145.33095665139552 (T) = (0 -943.5256872067196) / Math.Sqrt((100.76093042903165 / (21)) + (1.9921542971535473 / (13))) is less than -2.03693334345674 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (13) - 2, .025) and -0.5214730941818898 = (620.1395810512588 - 943.5256872067196) / 620.1395810512588 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

JIT Disasms

Baseline
Compare
Diff

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseEndianness


Description of detection logic

IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 941.8282251056002 > 645.1990668248882.
IsChangePoint: Marked as a change because one of 5/3/2023 7:05:50 AM, 5/9/2023 7:24:34 AM falls between 4/30/2023 6:17:41 PM and 5/9/2023 7:24:34 AM.
IsRegressionStdDev: Marked as regression because -172.69616839909932 (T) = (0 -942.899495537063) / Math.Sqrt((71.28264791595957 / (21)) + (0.9109916109751146 / (13))) is less than -2.03693334345674 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (13) - 2, .025) and -0.5172382205961809 = (621.4577794952738 - 942.899495537063) / 621.4577794952738 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

JIT Disasms

Baseline
Compare
Diff

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

Author: performanceautofiler[bot]
Assignees: AndyAyersMS
Labels:

area-System.Buffers, os-windows, arch-x64, runtime-coreclr

Milestone: -

@cincuranet
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cincuranet commented May 9, 2023

Commit range is 7afd85d...edd6d63. Probably #85654, @jakobbotsch? Link to the benchmark.

Similar stuff in #85994.

@jakobbotsch
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Seems unlikely, #85654 had no diffs related to those benchmarks. But I don't see how the other commits would affect those benchmarks either.

@AndyAyersMS AndyAyersMS removed their assignment May 9, 2023
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Also could be #85559 -- perhaps, some empty arrays got moved and so perturbed the alignment of the benchmark array?

@tannergooding tannergooding removed the untriaged New issue has not been triaged by the area owner label May 26, 2023
@ericstj ericstj added this to the 8.0.0 milestone Jul 24, 2023
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This one is worth investigating more. It remains almost 1.5x slower with no clear culprit.

@jakobbotsch
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I'll take a closer look.

@jakobbotsch jakobbotsch self-assigned this Jul 25, 2023
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Yes this is from #85559, cc @EgorBo.

We end up putting a static array field used in the micro benchmark on the non-GC heap, but then we constant propagate its address into a loop and regress performance of the loop.

I wonder if we can generally avoid propagating from low weight blocks to high weight blocks, although it's probably not that simple. It also doesn't seem feasible to fix this in 8.0, so I will move this to 9.0.

-Importing BB01 (PC=000) of 'System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseUsingNtoH():int[]:this'
-    [ 0]   0 (0x000) ldsfld 04000B90
-Checking if we can import 'static readonly' as a jit-time constant... 
-    [ 1]   5 (0x005) stloc.0Querying runtime about current class of field <unknown class>:<unknown field> (declared as int[])
-Runtime reports field is init-only and initialized and has class int[]
-
-lvaUpdateClass: Updating class for V01 from (00007FFAE8373060) int[] to (00007FFAE8373060) int[] [exact]
-
-
-STMT00000 ( 0x000[E-] ... ??? )
-               [000003] -A--G------                         ▌  ASG       ref   
-               [000002] D------N---                         ├──▌  LCL_VAR   ref    V01 loc0         
-               [000001] #---G------                         └──▌  IND       ref   
-               [000000] H----------                            └──▌  CNS_INT(h) long   0x1f0ccc06c08 const ptr Fseq[<unknown field>]

+Importing BB01 (PC=000) of 'System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseUsingNtoH():int[]:this'
+    [ 0]   0 (0x000) ldsfld 04000B90
+Checking if we can import 'static readonly' as a jit-time constant... ... success! The value is:
+               [000000] H----------                         ▌  CNS_INT(h) ref   
+
+    [ 1]   5 (0x005) stloc.0
+
+STMT00000 ( 0x000[E-] ... ??? )
+               [000002] -A---------                         ▌  ASG       ref   
+               [000001] D------N---                         ├──▌  LCL_VAR   ref    V01 loc0         
+               [000000] H----------                         └──▌  CNS_INT(h) ref   

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseUsingNtoH

Hot functions:

  • (96.83%) BinaryReadAndWriteTests.MeasureReverseUsingNtoH (Tier-1)
    • Has diffs
  • (1.51%) Runnable_0.WorkloadActionUnroll (Tier-1)
    • No diffs
Diffs

[MicroBenchmarks]BinaryReadAndWriteTests.MeasureReverseUsingNtoH()

 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def
-;  V01 loc0         [V01,T03] (  6, 10   )     ref  ->  rdx         class-hnd exact
+;  V01 loc0         [V01,T03] (  6, 10   )     ref  ->  rdx         class-hnd
 ;  V02 loc1         [V02,T00] ( 12, 18.08)     int  ->  rax        
 ;  V03 OutArgs      [V03    ] (  1,  1   )  struct (32) [rsp+00H]   do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V04 tmp1         [V04,T01] (  4, 16   )     int  ->   r9         "Strict ordering of exceptions for Array store"
@@ -175,36 +175,39 @@ G_M5635_IG08:
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def
-;  V01 loc0         [V01,T03] (  4, 10   )     ref  ->  rax         class-hnd exact single-def
-;  V02 loc1         [V02,T00] (  5, 17   )     int  ->  rdx        
+;* V01 loc0         [V01,T03] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def
+;  V02 loc1         [V02,T00] (  5, 17   )     int  ->  rax        
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+00H]   do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V04 tmp1         [V04,T01] (  2, 16   )     int  ->   r8         "Strict ordering of exceptions for Array store"
+;  V04 tmp1         [V04,T01] (  2, 16   )     int  ->  rcx         "Strict ordering of exceptions for Array store"
 ;* V05 tmp2         [V05    ] (  0,  0   )     int  ->  zero-ref    "Inlining Arg"
 ;* V06 tmp3         [V06    ] (  0,  0   )     int  ->  zero-ref    "Inline return value spill temp"
-;  V07 cse0         [V07,T02] (  3, 12   )    long  ->  rcx         "CSE - aggressive"
+;  V07 cse0         [V07,T02] (  3, 12   )    long  ->  rdx         "CSE - aggressive"
 ;
 ; Lcl frame size = 0
 
 G_M5635_IG01:
 						;; size=0 bbWeight=1 PerfScore 0.00
 G_M5635_IG02:
-       mov      rax, 0xD1FFAB1E      ; const ptr
-       mov      rax, gword ptr [rax]
-       xor      edx, edx
-       align    [1 bytes for IG03]
-						;; size=16 bbWeight=1 PerfScore 2.75
+       xor      eax, eax
+       align    [0 bytes for IG03]
+						;; size=2 bbWeight=1 PerfScore 0.25
 G_M5635_IG03:
-       mov      ecx, edx
-       movbe    r8d, dword ptr [rax+4*rcx+10H]
-       mov      dword ptr [rax+4*rcx+10H], r8d
-       inc      edx
-       cmp      edx, 1
+       mov      edx, eax
+       mov      rcx, 0xD1FFAB1E
+       movbe    ecx, dword ptr [rcx+4*rdx]
+       mov      r8, 0xD1FFAB1E
+       mov      dword ptr [r8+4*rdx], ecx
+       inc      eax
+       cmp      eax, 1
        jl       SHORT G_M5635_IG03
-						;; size=21 bbWeight=4 PerfScore 23.00
+						;; size=38 bbWeight=4 PerfScore 25.00
 G_M5635_IG04:
+       mov      rax, 0xD1FFAB1E
+						;; size=10 bbWeight=1 PerfScore 0.25
+G_M5635_IG05:
        ret      
 						;; size=1 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 38, prolog size 0, PerfScore 30.55, instruction count 11, allocated bytes for code 38 (MethodHash=87c1e9fc) for method System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseUsingNtoH():int[]:this
+; Total bytes of code 51, prolog size 0, PerfScore 31.60, instruction count 12, allocated bytes for code 51 (MethodHash=87c1e9fc) for method System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseUsingNtoH():int[]:this
 ; ============================================================
 

System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseEndianness

Hot functions:

  • (97.28%) BinaryReadAndWriteTests.MeasureReverseEndianness (Tier-1)
    • Has diffs
  • (1.38%) Runnable_0.WorkloadActionUnroll (Tier-1)
    • No diffs
Diffs

[MicroBenchmarks]BinaryReadAndWriteTests.MeasureReverseEndianness()

 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def
-;  V01 loc0         [V01,T03] (  6, 10   )     ref  ->  rdx         class-hnd exact
+;  V01 loc0         [V01,T03] (  6, 10   )     ref  ->  rdx         class-hnd
 ;  V02 loc1         [V02,T00] ( 12, 18.08)     int  ->  rax        
 ;  V03 OutArgs      [V03    ] (  1,  1   )  struct (32) [rsp+00H]   do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;  V04 tmp1         [V04,T01] (  4, 16   )     int  ->   r9         "Strict ordering of exceptions for Array store"
@@ -171,34 +171,37 @@ G_M42778_IG08:
 ; Final local variable assignments
 ;
 ;* V00 this         [V00    ] (  0,  0   )     ref  ->  zero-ref    this class-hnd single-def
-;  V01 loc0         [V01,T03] (  4, 10   )     ref  ->  rax         class-hnd exact single-def
-;  V02 loc1         [V02,T00] (  5, 17   )     int  ->  rdx        
+;* V01 loc0         [V01,T03] (  0,  0   )     ref  ->  zero-ref    class-hnd single-def
+;  V02 loc1         [V02,T00] (  5, 17   )     int  ->  rax        
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+00H]   do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
-;  V04 tmp1         [V04,T01] (  2, 16   )     int  ->   r8         "Strict ordering of exceptions for Array store"
-;  V05 cse0         [V05,T02] (  3, 12   )    long  ->  rcx         "CSE - aggressive"
+;  V04 tmp1         [V04,T01] (  2, 16   )     int  ->  rcx         "Strict ordering of exceptions for Array store"
+;  V05 cse0         [V05,T02] (  3, 12   )    long  ->  rdx         "CSE - aggressive"
 ;
 ; Lcl frame size = 0
 
 G_M42778_IG01:
 						;; size=0 bbWeight=1 PerfScore 0.00
 G_M42778_IG02:
-       mov      rax, 0xD1FFAB1E      ; const ptr
-       mov      rax, gword ptr [rax]
-       xor      edx, edx
-       align    [1 bytes for IG03]
-						;; size=16 bbWeight=1 PerfScore 2.75
+       xor      eax, eax
+       align    [0 bytes for IG03]
+						;; size=2 bbWeight=1 PerfScore 0.25
 G_M42778_IG03:
-       mov      ecx, edx
-       movbe    r8d, dword ptr [rax+4*rcx+10H]
-       mov      dword ptr [rax+4*rcx+10H], r8d
-       inc      edx
-       cmp      edx, 1
+       mov      edx, eax
+       mov      rcx, 0xD1FFAB1E
+       movbe    ecx, dword ptr [rcx+4*rdx]
+       mov      r8, 0xD1FFAB1E
+       mov      dword ptr [r8+4*rdx], ecx
+       inc      eax
+       cmp      eax, 1
        jl       SHORT G_M42778_IG03
-						;; size=21 bbWeight=4 PerfScore 23.00
+						;; size=38 bbWeight=4 PerfScore 25.00
 G_M42778_IG04:
+       mov      rax, 0xD1FFAB1E
+						;; size=10 bbWeight=1 PerfScore 0.25
+G_M42778_IG05:
        ret      
 						;; size=1 bbWeight=1 PerfScore 1.00
 
-; Total bytes of code 38, prolog size 0, PerfScore 30.55, instruction count 11, allocated bytes for code 38 (MethodHash=bce858e5) for method System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseEndianness():int[]:this
+; Total bytes of code 51, prolog size 0, PerfScore 31.60, instruction count 12, allocated bytes for code 51 (MethodHash=bce858e5) for method System.Buffers.Binary.Tests.BinaryReadAndWriteTests:MeasureReverseEndianness():int[]:this
 ; ============================================================
 

@jakobbotsch
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I'll actually leave this in 8.0 for a bit, maybe someone else has an idea about something we can do.

@AndyAyersMS
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image

Only seems to affect intel x64.

@jakobbotsch
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I think we should do something here, but I do not see any possible surgical fix. I think ideally this is fixed by 1) avoiding this propagation of constants into loops/higher weighted blocks in the first place, and 2) some rematerialization support for constants to not regress register allocation when we do 1.
Will move this to 9.0.

@jakobbotsch jakobbotsch added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label May 3, 2024
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

@jakobbotsch
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Moving to 10 for the same reason as the above. We sadly did not get around to revisiting some of the necessities for improving cases like this one.

@jakobbotsch jakobbotsch modified the milestones: 9.0.0, 10.0.0 Jul 29, 2024
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