[X64] [xtqqczze] Seal overridden virtual method `SetDefaultFallbacks`

[MihuBot]

Job completed in 29 minutes.
dotnet/runtime#100030

Diffs

Found 259 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 39663356
Total bytes of diff: 39663376
Total bytes of delta: 20 (0.00 % of base)
Total relative delta: 0.29
    diff is a regression.
    relative diff is a regression.


Top file regressions (bytes):
          20 : System.Private.CoreLib.dasm (0.00 % of base)

1 total files with Code Size differences (0 improved, 1 regressed), 255 unchanged.

Top method regressions (bytes):
          20 (28.99 % of base) : System.Private.CoreLib.dasm - System.Text.Latin1Encoding:.ctor():this (FullOpts)

Top method regressions (percentages):
          20 (28.99 % of base) : System.Private.CoreLib.dasm - System.Text.Latin1Encoding:.ctor():this (FullOpts)

1 total methods with Code Size differences (0 improved, 1 regressed), 244925 unchanged.

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Artifacts:

• build-artifacts-main.zip (664 MB)
• build-clr-checked-main.zip (84 MB)
• build-artifacts-pr.zip (664 MB)
• build-clr-checked-pr.zip (84 MB)
• diff-frameworks.txt (920 B)
• jit-diffs-frameworks.zip (261 MB)

[MihuBot]

Top method regressions

20 (28.99 % of base) - System.Text.Latin1Encoding:.ctor():this

 ; Assembly listing for method System.Text.Latin1Encoding:.ctor():this (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
-; rbp based frame
+; rsp based frame
 ; partially interruptible
 ; No PGO data
-; 0 inlinees with PGO data; 2 single block inlinees; 0 inlinees without PGO data
+; 0 inlinees with PGO data; 4 single block inlinees; 0 inlinees without PGO data
 ; Final local variable assignments
 ;
 ;  V00 this         [V00,T00] (  6,  6   )     ref  ->  rbx         this class-hnd single-def <System.Text.Latin1Encoding>
 ;# V01 OutArgs      [V01    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;
-; Lcl frame size = 8
+; Lcl frame size = 0
 
 G_M19309_IG01:
-       push     rbp
        push     rbx
-       push     rax
-       lea      rbp, [rsp+0x10]
        mov      rbx, rdi
-						;; size=11 bbWeight=1 PerfScore 3.75
+						;; size=4 bbWeight=1 PerfScore 1.25
 G_M19309_IG02:
        mov      byte  ptr [rbx+0x24], 1
        mov      edi, 0x6FAF
        mov      rsi, 0xD1FFAB1E      ; 'codePage'
        mov      rax, 0xD1FFAB1E      ; code for System.ArgumentOutOfRangeException:ThrowIfNegative[int](int,System.String)
        call     [rax]System.ArgumentOutOfRangeException:ThrowIfNegative[int](int,System.String)
        mov      dword ptr [rbx+0x20], 0x6FAF
-       mov      rdi, rbx
-       mov      rax, qword ptr [rbx]
-       mov      rax, qword ptr [rax+0x40]
-						;; size=48 bbWeight=1 PerfScore 10.00
+       mov      rdi, 0xD1FFAB1E      ; const ptr
+       mov      rsi, gword ptr [rdi]
+       lea      rdi, bword ptr [rbx+0x10]
+       call     CORINFO_HELP_ASSIGN_REF
+       mov      rdi, 0xD1FFAB1E      ; const ptr
+       mov      rsi, gword ptr [rdi]
+       lea      rdi, bword ptr [rbx+0x18]
+       call     CORINFO_HELP_ASSIGN_REF
+       nop      
+						;; size=83 bbWeight=1 PerfScore 13.50
 G_M19309_IG03:
-       add      rsp, 8
        pop      rbx
-       pop      rbp
-       tail.jmp [rax+0x20]System.Text.Encoding:SetDefaultFallbacks():this
-						;; size=10 bbWeight=1 PerfScore 3.25
+       ret      
+						;; size=2 bbWeight=1 PerfScore 1.50
 
-; Total bytes of code 69, prolog size 8, PerfScore 17.00, instruction count 18, allocated bytes for code 69 (MethodHash=7ce9b492) for method System.Text.Latin1Encoding:.ctor():this (FullOpts)
+; Total bytes of code 89, prolog size 1, PerfScore 16.25, instruction count 19, allocated bytes for code 89 (MethodHash=7ce9b492) for method System.Text.Latin1Encoding:.ctor():this (FullOpts)

[MihuBot]

@xtqqczze

[xtqqczze]

diffs shows improvement to PerfScore from improved inlining.