[X64] [EgorBo] JIT: Intrinsify ClearWithoutReferences and Fill

[MihuBot]

Build completed in 2 hours 6 minutes.
dotnet/runtime#98700

CoreLib diffs

Found 2 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 6844398
Total bytes of diff: 6844404
Total bytes of delta: 6 (0.00 % of base)
Total relative delta: 0.38
    diff is a regression.
    relative diff is a regression.


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

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

Top method regressions (bytes):
           6 (37.50 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)

Top method regressions (percentages):
           6 (37.50 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)

1 total methods with Code Size differences (0 improved, 1 regressed), 56434 unchanged.

--------------------------------------------------------------------------------

Frameworks diffs

Diffs

Found 259 files with textual diffs.

Summary of Code Size diffs:
(Lower is better)

Total bytes of base: 38279728
Total bytes of diff: 38279485
Total bytes of delta: -243 (-0.00 % of base)
Total relative delta: Infinity
    diff is an improvement.
    relative diff is a regression.


Top file regressions (bytes):
         128 : System.DirectoryServices.Protocols.dasm (0.09 % of base)
           6 : System.Private.CoreLib.dasm (0.00 % of base)

Top file improvements (bytes):
        -377 : System.Net.Sockets.dasm (-0.15 % of base)

3 total files with Code Size differences (1 improved, 2 regressed), 253 unchanged.

Top method regressions (bytes):
         128 (Infinity of base) : System.DirectoryServices.Protocols.dasm - System.DirectoryServices.Protocols.PartialResultsRetriever:ThreadRoutine():this (FullOpts)
           6 (37.50 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)

Top method improvements (bytes):
        -377 (-100.00 % of base) : System.Net.Sockets.dasm - System.Net.Sockets.SocketAsyncEngine:EventLoop():this (FullOpts)

Top method regressions (percentages):
         128 (Infinity of base) : System.DirectoryServices.Protocols.dasm - System.DirectoryServices.Protocols.PartialResultsRetriever:ThreadRoutine():this (FullOpts)
           6 (37.50 % of base) : System.Private.CoreLib.dasm - System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)

Top method improvements (percentages):
        -377 (-100.00 % of base) : System.Net.Sockets.dasm - System.Net.Sockets.SocketAsyncEngine:EventLoop():this (FullOpts)

3 total methods with Code Size differences (1 improved, 2 regressed), 239345 unchanged.

--------------------------------------------------------------------------------

Artifacts:

• build-artifacts-main.zip (663 MB)
• build-clr-checked-main.zip (74 MB)
• build-artifacts-pr.zip (663 MB)
• build-clr-checked-pr.zip (74 MB)
• jit-diffs-corelib.zip (48 MB)
• diff-corelib.txt (968 B)
• jit-diffs-frameworks.zip (251 MB)
• diff-frameworks.txt (1 KB)
• build-logs.txt (1 MB)

[MihuBot]

Top method regressions

6 (37.50 % of base) - System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte)

 ; Assembly listing for method System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)
 ; Emitting BLENDED_CODE for X64 with AVX - Unix
 ; FullOpts code
 ; optimized code
 ; rsp based frame
-; fully interruptible
+; partially interruptible
 ; No PGO data
 ; Final local variable assignments
 ;
 ;  V00 arg0         [V00,T00] (  3,  3   )    long  ->  rdi         single-def
 ;  V01 arg1         [V01,T01] (  3,  3   )    long  ->  rsi         single-def
 ;  V02 arg2         [V02,T02] (  3,  3   )   ubyte  ->  rdx         single-def
 ;# V03 OutArgs      [V03    ] (  1,  1   )  struct ( 0) [rsp+0x00]  do-not-enreg[XS] addr-exposed "OutgoingArgSpace"
 ;
-; Lcl frame size = 0
+; Lcl frame size = 8
 
 G_M48403_IG01:
-						;; size=0 bbWeight=1 PerfScore 0.00
+       push     rax
+						;; size=1 bbWeight=1 PerfScore 1.00
 G_M48403_IG02:
        movzx    rdx, dl
        mov      rax, 0xD1FFAB1E      ; code for System.SpanHelpers:Fill[ubyte](byref,ulong,ubyte)
-						;; size=13 bbWeight=1 PerfScore 0.50
+       call     [rax]System.SpanHelpers:Fill[ubyte](byref,ulong,ubyte)
+       nop      
+						;; size=16 bbWeight=1 PerfScore 3.75
 G_M48403_IG03:
-       tail.jmp [rax]System.SpanHelpers:Fill[ubyte](byref,ulong,ubyte)
-						;; size=3 bbWeight=1 PerfScore 2.00
+       add      rsp, 8
+       ret      
+						;; size=5 bbWeight=1 PerfScore 1.25
 
-; Total bytes of code 16, prolog size 0, PerfScore 2.50, instruction count 3, allocated bytes for code 16 (MethodHash=ef1742ec) for method System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)
+; Total bytes of code 22, prolog size 1, PerfScore 6.00, instruction count 7, allocated bytes for code 22 (MethodHash=ef1742ec) for method System.Runtime.InteropServices.NativeMemory:Fill(ulong,ulong,ubyte) (FullOpts)

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