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Span_IndexOf_31_vs_50

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## .NET Core 3.1.6 (CoreCLR 4.700.20.26901, CoreFX 4.700.20.31603), X64 RyuJIT

## .NET Core 5.0.0 (CoreCLR 5.0.20.40416, CoreFX 5.0.20.40416), X64 RyuJIT

```assembly

; System.Memory.Span`1[[System.Char, System.Private.CoreLib]].IndexOfValue()

sub rsp,28

mov rdx,[rcx+18]

test rdx,rdx

jne short M00_L00

xor r8d,r8d

xor eax,eax

jmp short M00_L01

M00_L00:

lea r8,[rdx+10]

mov eax,[rdx+8]

M00_L01:

movzx ecx,word ptr [rcx+2C]

movzx edx,word ptr [rcx+2C]

mov [rsp+24],ecx

mov edx,[rsp+24]

mov rcx,r8

mov r8d,eax

call System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)

nop

add rsp,28

ret

; Total bytes of code 56

; Total bytes of code 48

```

```assembly

; System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)

push rsi

vzeroupper

xor r9d,r9d

movsxd r10,r8d

mov rax,r10

mov r11,rcx

test r11b,1

jne short M01_L01

cmp r8d,10

jl short M01_L01

mov rax,rcx

neg eax

mov r8d,eax

shr r8d,1F

add eax,r8d

sar eax,1

mov eax,eax

and rax,7

cmp rax,4

jl short M01_L02

M01_L00:

lea r8,[rcx+r9*2]

movzx r11d,dx

movzx esi,word ptr [r8]

cmp r11d,esi

je near ptr M01_L16

movzx esi,word ptr [r8+2]

cmp r11d,esi

je near ptr M01_L15

movzx esi,word ptr [r8+4]

cmp r11d,esi

je near ptr M01_L14

movzx r8d,word ptr [r8+6]

cmp r11d,r8d

je near ptr M01_L13

add r9,4

add rax,0FFFFFFFFFFFFFFFC

M01_L01:

cmp rax,4

jge short M01_L00

M01_L02:

test rax,rax

jle short M01_L04

movzx r11d,dx

M01_L03:

movzx r8d,word ptr [rcx+r9*2]

cmp r8d,r11d

je near ptr M01_L16

inc r9

dec rax

test rax,rax

jg short M01_L03

M01_L04:

cmp r9,r10

jge near ptr M01_L12

lea rax,[rcx+r9*2]

mov r11,rax

test r11b,1F

mov r8d,r11d

test r8b,1F

je short M01_L06

movzx r11d,dx

vmovd xmm0,r11d

vpbroadcastw xmm0,xmm0

vmovupd xmm1,[rax]

vpcmpeqw xmm0,xmm0,xmm1

vpmovmskb r11d,xmm0

test r11d,r11d

jne short M01_L05

add r9,8

jmp short M01_L06

M01_L05:

xor eax,eax

xor r10d,r10d

tzcnt eax,r11d

tzcnt r10d,r11d

mov r10d,eax

shr r10d,1

shr r10d,1F

mov edx,r10d

add eax,r10d

mov eax,edx

sar eax,1

add eax,r9d

jmp near ptr M01_L17

M01_L06:

mov rax,r10

已保存差異

原始文本

開啟檔案

## .NET Core 3.1.6 (CoreCLR 4.700.20.26901, CoreFX 4.700.20.31603), X64 RyuJIT
```assembly
; System.Memory.Span`1[[System.Char, System.Private.CoreLib]].IndexOfValue()
       sub       rsp,28
       mov       rdx,[rcx+18]
       test      rdx,rdx
       jne       short M00_L00
       xor       r8d,r8d
       xor       eax,eax
       jmp       short M00_L01
M00_L00:
       lea       r8,[rdx+10]
       mov       eax,[rdx+8]
M00_L01:
       movzx     ecx,word ptr [rcx+2C]
       mov       [rsp+24],ecx
       mov       edx,[rsp+24]
       mov       rcx,r8
       mov       r8d,eax
       call      System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)
       nop
       add       rsp,28
       ret
; Total bytes of code 56
```
```assembly
; System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)
       push      rsi
       vzeroupper
       xor       r9d,r9d
       movsxd    r10,r8d
       mov       rax,r10
       mov       r11,rcx
       test      r11b,1
       jne       short M01_L01
       cmp       r8d,10
       jl        short M01_L01
       mov       rax,rcx
       neg       eax
       mov       r8d,eax
       shr       r8d,1F
       add       eax,r8d
       sar       eax,1
       mov       eax,eax
       and       rax,7
       cmp       rax,4
       jl        short M01_L02
M01_L00:
       lea       r8,[rcx+r9*2]
       movzx     r11d,dx
       movzx     esi,word ptr [r8]
       cmp       r11d,esi
       je        near ptr M01_L16
       movzx     esi,word ptr [r8+2]
       cmp       r11d,esi
       je        near ptr M01_L15
       movzx     esi,word ptr [r8+4]
       cmp       r11d,esi
       je        near ptr M01_L14
       movzx     r8d,word ptr [r8+6]
       cmp       r11d,r8d
       je        near ptr M01_L13
       add       r9,4
       add       rax,0FFFFFFFFFFFFFFFC
M01_L01:
       cmp       rax,4
       jge       short M01_L00
M01_L02:
       test      rax,rax
       jle       short M01_L04
       movzx     r11d,dx
M01_L03:
       movzx     r8d,word ptr [rcx+r9*2]
       cmp       r8d,r11d
       je        near ptr M01_L16
       inc       r9
       dec       rax
       test      rax,rax
       jg        short M01_L03
M01_L04:
       cmp       r9,r10
       jge       near ptr M01_L12
       lea       rax,[rcx+r9*2]
       mov       r11,rax
       test      r11b,1F
       je        short M01_L06
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw xmm0,xmm0
       vmovupd   xmm1,[rax]
       vpcmpeqw  xmm0,xmm0,xmm1
       vpmovmskb r11d,xmm0
       test      r11d,r11d
       jne       short M01_L05
       add       r9,8
       jmp       short M01_L06
M01_L05:
       xor       eax,eax
       tzcnt     eax,r11d
       mov       r10d,eax
       shr       r10d,1F
       add       eax,r10d
       sar       eax,1
       add       eax,r9d
       jmp       near ptr M01_L17
M01_L06:
       mov       rax,r10
       sub       rax,r9
       and       rax,0FFFFFFFFFFFFFFF0
       test      rax,rax
       jle       short M01_L08
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw ymm0,xmm0
M01_L07:
       vmovupd   ymm1,[rcx+r9*2]
       vpcmpeqw  ymm1,ymm0,ymm1
       vpmovmskb r8d,ymm1
       test      r8d,r8d
       jne       short M01_L09
       add       r9,10
       add       rax,0FFFFFFFFFFFFFFF0
       test      rax,rax
       jg        short M01_L07
M01_L08:
       mov       rax,r10
       sub       rax,r9
       and       rax,0FFFFFFFFFFFFFFF8
       test      rax,rax
       jle       short M01_L11
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw xmm0,xmm0
       vmovupd   xmm1,[rcx+r9*2]
       vpcmpeqw  xmm0,xmm0,xmm1
       vpmovmskb eax,xmm0
       test      eax,eax
       jne       short M01_L10
       add       r9,8
       jmp       short M01_L11
M01_L09:
       xor       eax,eax
       tzcnt     eax,r8d
       mov       r10d,eax
       shr       r10d,1F
       add       eax,r10d
       sar       eax,1
       add       eax,r9d
       jmp       short M01_L17
M01_L10:
       tzcnt     eax,eax
       mov       edx,eax
       shr       edx,1F
       add       eax,edx
       sar       eax,1
       add       eax,r9d
       jmp       short M01_L17
M01_L11:
       cmp       r9,r10
       jge       short M01_L12
       mov       rax,r10
       sub       rax,r9
       jmp       near ptr M01_L01
M01_L12:
       mov       eax,0FFFFFFFF
       vzeroupper
       pop       rsi
       ret
M01_L13:
       lea       eax,[r9+3]
       jmp       short M01_L17
M01_L14:
       lea       eax,[r9+2]
       jmp       short M01_L17
M01_L15:
       lea       eax,[r9+1]
       jmp       short M01_L17
M01_L16:
       mov       eax,r9d
M01_L17:
       vzeroupper
       pop       rsi
       ret
; Total bytes of code 462
```

更改後文本

開啟檔案

## .NET Core 5.0.0 (CoreCLR 5.0.20.40416, CoreFX 5.0.20.40416), X64 RyuJIT
```assembly
; System.Memory.Span`1[[System.Char, System.Private.CoreLib]].IndexOfValue()
       sub       rsp,28
       mov       rdx,[rcx+18]
       test      rdx,rdx
       jne       short M00_L00
       xor       r8d,r8d
       xor       eax,eax
       jmp       short M00_L01
M00_L00:
       lea       r8,[rdx+10]
       mov       eax,[rdx+8]
M00_L01:
       movzx     edx,word ptr [rcx+2C]
       mov       rcx,r8
       mov       r8d,eax
       call      System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)
       nop
       add       rsp,28
       ret
; Total bytes of code 48
```
```assembly
; System.SpanHelpers.IndexOf(Char ByRef, Char, Int32)
       push      rsi
       vzeroupper
       xor       r9d,r9d
       movsxd    r10,r8d
       mov       rax,r10
       mov       r11,rcx
       test      r11b,1
       jne       short M01_L01
       cmp       r8d,10
       jl        short M01_L01
       mov       rax,rcx
       neg       eax
       mov       r8d,eax
       shr       r8d,1F
       add       eax,r8d
       sar       eax,1
       mov       eax,eax
       and       rax,7
       cmp       rax,4
       jl        short M01_L02
M01_L00:
       lea       r8,[rcx+r9*2]
       movzx     r11d,dx
       movzx     esi,word ptr [r8]
       cmp       r11d,esi
       je        near ptr M01_L16
       movzx     esi,word ptr [r8+2]
       cmp       r11d,esi
       je        near ptr M01_L15
       movzx     esi,word ptr [r8+4]
       cmp       r11d,esi
       je        near ptr M01_L14
       movzx     r8d,word ptr [r8+6]
       cmp       r11d,r8d
       je        near ptr M01_L13
       add       r9,4
       add       rax,0FFFFFFFFFFFFFFFC
M01_L01:
       cmp       rax,4
       jge       short M01_L00
M01_L02:
       test      rax,rax
       jle       short M01_L04
       movzx     r11d,dx
M01_L03:
       movzx     r8d,word ptr [rcx+r9*2]
       cmp       r8d,r11d
       je        near ptr M01_L16
       inc       r9
       dec       rax
       test      rax,rax
       jg        short M01_L03
M01_L04:
       cmp       r9,r10
       jge       near ptr M01_L12
       lea       rax,[rcx+r9*2]
       mov       r11,rax
       mov       r8d,r11d
       test      r8b,1F
       je        short M01_L06
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw xmm0,xmm0
       vmovupd   xmm1,[rax]
       vpcmpeqw  xmm0,xmm0,xmm1
       vpmovmskb r11d,xmm0
       test      r11d,r11d
       jne       short M01_L05
       add       r9,8
       jmp       short M01_L06
M01_L05:
       xor       r10d,r10d
       tzcnt     r10d,r11d
       shr       r10d,1
       mov       edx,r10d
       mov       eax,edx
       add       eax,r9d
       jmp       near ptr M01_L17
M01_L06:
       mov       rax,r10
       sub       rax,r9
       and       rax,0FFFFFFFFFFFFFFF0
       jle       short M01_L08
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw ymm0,xmm0
M01_L07:
       vmovupd   ymm1,[rcx+r9*2]
       vpcmpeqw  ymm1,ymm0,ymm1
       vpmovmskb r8d,ymm1
       test      r8d,r8d
       jne       short M01_L09
       add       r9,10
       add       rax,0FFFFFFFFFFFFFFF0
       test      rax,rax
       jg        short M01_L07
M01_L08:
       mov       rax,r10
       sub       rax,r9
       and       rax,0FFFFFFFFFFFFFFF8
       jle       short M01_L11
       movzx     r11d,dx
       vmovd     xmm0,r11d
       vpbroadcastw xmm0,xmm0
       vmovupd   xmm1,[rcx+r9*2]
       vpcmpeqw  xmm0,xmm0,xmm1
       vpmovmskb eax,xmm0
       test      eax,eax
       jne       short M01_L10
       add       r9,8
       jmp       short M01_L11
M01_L09:
       xor       eax,eax
       tzcnt     eax,r8d
       shr       eax,1
       mov       r10d,eax
       mov       eax,r10d
       add       eax,r9d
       jmp       short M01_L17
M01_L10:
       xor       edx,edx
       tzcnt     edx,eax
       shr       edx,1
       mov       ecx,edx
       mov       eax,ecx
       add       eax,r9d
       jmp       short M01_L17
M01_L11:
       cmp       r9,r10
       jge       short M01_L12
       mov       rax,r10
       sub       rax,r9
       jmp       near ptr M01_L01
M01_L12:
       mov       eax,0FFFFFFFF
       vzeroupper
       pop       rsi
       ret
M01_L13:
       lea       eax,[r9+3]
       jmp       short M01_L17
M01_L14:
       lea       eax,[r9+2]
       jmp       short M01_L17
M01_L15:
       lea       eax,[r9+1]
       jmp       short M01_L17
M01_L16:
       mov       eax,r9d
M01_L17:
       vzeroupper
       pop       rsi
       ret
; Total bytes of code 451
```