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; Assembly listing for method System.SpanHelpers:Fill(byref,long,int)

; Emitting BLENDED_CODE for generic ARM64 CPU - Unix

; ReadyToRun compilation

; optimized code

; fp based frame

; fully interruptible

; No matching PGO data

; 0 inlinees with PGO data; 43 single block inlinees; 1 inlinees without PGO data

; Final local variable assignments

;

; V00 arg0 [V00,T00] ( 18, 38 ) byref -> x0 single-def

; V01 arg1 [V01,T07] ( 10, 6.50) long -> x1 single-def

; V02 arg2 [V02,T01] ( 18, 38 ) int -> x2 single-def

; V03 loc0 [V03,T04] ( 12, 20 ) long -> x3

; V04 loc1 [V04,T13] ( 2, 1 ) int -> x2 ld-addr-op

; V05 loc2 [V05,T15] ( 5, 9.50) simd16 -> d16 HFA(simd16) ld-addr-op

; V06 loc3 [V06,T06] ( 5, 9.50) byref -> x0 single-def

; V07 loc4 [V07,T11] ( 4, 2 ) long -> x2

; V08 loc5 [V08,T08] ( 2, 4.50) long -> x3

; V09 loc6 [V09,T03] ( 7, 21 ) long -> x4

;* V10 loc7 [V10 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16)

; V11 loc8 [V11,T09] ( 2, 4.50) long -> x4

;# V12 OutArgs [V12 ] ( 1, 1 ) lclBlk ( 0) [sp+00H] "OutgoingArgSpace"

; V13 tmp1 [V13,T05] ( 2, 16 ) long -> x3 "dup spill"

;* V14 tmp2 [V14 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "NewObj constructor temp"

;* V15 tmp3 [V15 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16)

; V16 tmp4 [V16,T16] ( 2, 2 ) simd16 -> d16 HFA(simd16) "NewObj constructor temp"

;* V17 tmp5 [V17 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16)

;* V18 tmp6 [V18 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "NewObj constructor temp"

;* V19 tmp7 [V19,T14] ( 0, 0 ) bool -> zero-ref "Inline return value spill temp"

;* V20 tmp8 [V20 ] ( 0, 0 ) byref -> zero-ref "Inlining Arg"

;* V21 tmp9 [V21 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "Inlining Arg"

;* V22 tmp10 [V22 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V23 tmp11 [V23 ] ( 0, 0 ) byref -> zero-ref "Inlining Arg"

;* V24 tmp12 [V24 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "Inlining Arg"

;* V25 tmp13 [V25 ] ( 0, 0 ) byref -> zero-ref "Inlining Arg"

;* V26 tmp14 [V26 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "Inlining Arg"

;* V27 tmp15 [V27 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V28 tmp16 [V28 ] ( 0, 0 ) byref -> zero-ref "Inlining Arg"

;* V29 tmp17 [V29 ] ( 0, 0 ) simd16 -> zero-ref HFA(simd16) "Inlining Arg"

;* V30 tmp18 [V30 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V31 tmp19 [V31 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V32 tmp20 [V32 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V33 tmp21 [V33 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V34 tmp22 [V34 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V35 tmp23 [V35 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V36 tmp24 [V36 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V37 tmp25 [V37 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V38 tmp26 [V38 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V39 tmp27 [V39 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

;* V40 tmp28 [V40 ] ( 0, 0 ) long -> zero-ref "Inlining Arg"

; V41 cse0 [V41,T02] ( 9, 36 ) long -> x5 "CSE - aggressive"

; V42 cse1 [V42,T10] ( 5, 2.50) long -> x4 "CSE - moderate"

; V43 cse2 [V43,T12] ( 3, 1.50) long -> x4 "CSE - moderate"

;

; Lcl frame size = 0

G_M55887_IG01: ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG

stp fp, lr, [sp,#-16]!

mov fp, sp

;; bbWeight=1 PerfScore 1.50

G_M55887_IG02: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

; byrRegs +[x0]

cmp x1, #4

blo G_M55887_IG08

;; bbWeight=1 PerfScore 1.50

G_M55887_IG03: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

dup v16.4s, w2

lsl x2, x1, #2

and x3, x2, #-32

mov x4, xzr

cmp x1, #8

blo G_M55887_IG05

;; bbWeight=0.50 PerfScore 2.75

G_M55887_IG04: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

str q16, [x0, x4]

mov x1, #16

add x1, x4, #16

add x1, x4, x1

str q16, [x0, x1]

mov x1, #32

add x4, x4, #32

add x4, x4, x1

cmp x4, x3

blo G_M55887_IG04

;; bbWeight=4 PerfScore 22.00

;; bbWeight=4 PerfScore 18.00

G_M55887_IG05: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

tbz w2, #4, G_M55887_IG06

str q16, [x0, x4]

;; bbWeight=0.50 PerfScore 1.00

G_M55887_IG06: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref

movn x1, #15

sub x1, x2, #16

add x1, x2, x1

str q16, [x0, x1]

;; bbWeight=0.50 PerfScore 1.00

;; bbWeight=0.50 PerfScore 0.75

G_M55887_IG07: ; , epilog, nogc, extend

ldp fp, lr, [sp],#16

ret lr

;; bbWeight=0.50 PerfScore 1.00

G_M55887_IG08: ; gcVars=0000000000000000 {}, gcrefRegs=0000 {}, byrefRegs=0001 {x0}, gcvars, byref, isz

mov x3, xzr

cmp x1, #8

blo G_M55887_IG10

and x4, x1, #-8

;; bbWeight=0.50 PerfScore 1.25

G_M55887_IG09: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

lsl x5, x3, #2

str w2, [x0, x5]

mov x6, #4

add x6, x5, #4

add x6, x5, x6

str w2, [x0, x6]

mov x6, #8

add x6, x5, #8

add x6, x5, x6

str w2, [x0, x6]

mov x6, #12

add x6, x5, #12

add x6, x5, x6

str w2, [x0, x6]

mov x6, #16

add x6, x5, #16

add x6, x5, x6

str w2, [x0, x6]

mov x6, #20

add x6, x5, #20

add x6, x5, x6

str w2, [x0, x6]

mov x6, #24

add x6, x5, #24

add x6, x5, x6

str w2, [x0, x6]

mov x6, #28

add x5, x5, #28

add x5, x5, x6

str w2, [x0, x5]

mov x5, #8

add x3, x3, #8

add x3, x3, x5

cmp x3, x4

blo G_M55887_IG09

;; bbWeight=4 PerfScore 74.00

;; bbWeight=4 PerfScore 58.00

G_M55887_IG10: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

tbz w1, #2, G_M55887_IG11

lsl x4, x3, #2

str w2, [x0, x4]

mov x5, #4

add x5, x4, #4

add x5, x4, x5

str w2, [x0, x5]

mov x5, #8

add x5, x4, #8

add x5, x4, x5

str w2, [x0, x5]

mov x5, #12

add x4, x4, #12

add x4, x4, x5

str w2, [x0, x4]

mov x4, #4

add x3, x3, #4

add x3, x3, x4

;; bbWeight=0.50 PerfScore 4.00

;; bbWeight=0.50 PerfScore 5.00

G_M55887_IG11: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

tbz w1, #1, G_M55887_IG12

lsl x4, x3, #2

str w2, [x0, x4]

mov x5, #4

add x4, x4, #4

add x4, x4, x5

str w2, [x0, x4]

mov x4, #2

add x3, x3, #2

add x3, x3, x4

;; bbWeight=0.50 PerfScore 2.50

;; bbWeight=0.50 PerfScore 3.00

G_M55887_IG12: ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz

tbz w1, #0, G_M55887_IG13

lsl x1, x3, #2

str w2, [x0, x1]

;; bbWeight=0.50 PerfScore 1.50

G_M55887_IG13: ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc

; byrRegs -[x0]

ldp fp, lr, [sp],#16

ret lr

;; bbWeight=0.50 PerfScore 1.00

; Total bytes of code 332, prolog size 8, PerfScore 149.70, instruction count 83, allocated bytes for code 332 (MethodHash=f08325b0) for method System.SpanHelpers:Fill(byref,long,int)

; Total bytes of code 264, prolog size 8, PerfScore 121.15, instruction count 66, allocated bytes for code 264 (MethodHash=f08325b0) for method System.SpanHelpers:Fill(byref,long,int)

; ============================================================

Unwind Info:

>> Start offset : 0x000000 (not in unwind data)

>> End offset : 0xd1ffab1e (not in unwind data)

Code Words : 1

Epilog Count : 2

E bit : 0

X bit : 0

Vers : 0

Function Length : 83 (0x00053) Actual length = 332 (0x00014c)

Function Length : 66 (0x00042) Actual length = 264 (0x000108)

---- Epilog scopes ----

---- Scope 0

Epilog Start Offset : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

Epilog Start Index : 1 (0x01)

---- Scope 1

Epilog Start Offset : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)

Epilog Start Index : 1 (0x01)

---- Unwind codes ----

E1 set_fp; mov fp, sp

---- Epilog start at index 1 ----

81 save_fplr_x #1 (0x01); stp fp, lr, [sp, #-16]!

E4 end

Saved diffs

Original text

Open file

; Assembly listing for method System.SpanHelpers:Fill(byref,long,int)
; Emitting BLENDED_CODE for generic ARM64 CPU - Unix
; ReadyToRun compilation
; optimized code
; fp based frame
; fully interruptible
; No matching PGO data
; 0 inlinees with PGO data; 43 single block inlinees; 1 inlinees without PGO data
; Final local variable assignments
;
;  V00 arg0         [V00,T00] ( 18, 38   )   byref  ->   x0         single-def
;  V01 arg1         [V01,T07] ( 10,  6.50)    long  ->   x1         single-def
;  V02 arg2         [V02,T01] ( 18, 38   )     int  ->   x2         single-def
;  V03 loc0         [V03,T04] ( 12, 20   )    long  ->   x3        
;  V04 loc1         [V04,T13] (  2,  1   )     int  ->   x2         ld-addr-op
;  V05 loc2         [V05,T15] (  5,  9.50)  simd16  ->  d16         HFA(simd16)  ld-addr-op
;  V06 loc3         [V06,T06] (  5,  9.50)   byref  ->   x0         single-def
;  V07 loc4         [V07,T11] (  4,  2   )    long  ->   x2        
;  V08 loc5         [V08,T08] (  2,  4.50)    long  ->   x3        
;  V09 loc6         [V09,T03] (  7, 21   )    long  ->   x4        
;* V10 loc7         [V10    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16) 
;  V11 loc8         [V11,T09] (  2,  4.50)    long  ->   x4        
;# V12 OutArgs      [V12    ] (  1,  1   )  lclBlk ( 0) [sp+00H]   "OutgoingArgSpace"
;  V13 tmp1         [V13,T05] (  2, 16   )    long  ->   x3         "dup spill"
;* V14 tmp2         [V14    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "NewObj constructor temp"
;* V15 tmp3         [V15    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16) 
;  V16 tmp4         [V16,T16] (  2,  2   )  simd16  ->  d16         HFA(simd16)  "NewObj constructor temp"
;* V17 tmp5         [V17    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16) 
;* V18 tmp6         [V18    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "NewObj constructor temp"
;* V19 tmp7         [V19,T14] (  0,  0   )    bool  ->  zero-ref    "Inline return value spill temp"
;* V20 tmp8         [V20    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
;* V21 tmp9         [V21    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "Inlining Arg"
;* V22 tmp10        [V22    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V23 tmp11        [V23    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
;* V24 tmp12        [V24    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "Inlining Arg"
;* V25 tmp13        [V25    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
;* V26 tmp14        [V26    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "Inlining Arg"
;* V27 tmp15        [V27    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V28 tmp16        [V28    ] (  0,  0   )   byref  ->  zero-ref    "Inlining Arg"
;* V29 tmp17        [V29    ] (  0,  0   )  simd16  ->  zero-ref    HFA(simd16)  "Inlining Arg"
;* V30 tmp18        [V30    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V31 tmp19        [V31    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V32 tmp20        [V32    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V33 tmp21        [V33    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V34 tmp22        [V34    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V35 tmp23        [V35    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V36 tmp24        [V36    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V37 tmp25        [V37    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V38 tmp26        [V38    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V39 tmp27        [V39    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;* V40 tmp28        [V40    ] (  0,  0   )    long  ->  zero-ref    "Inlining Arg"
;  V41 cse0         [V41,T02] (  9, 36   )    long  ->   x5         "CSE - aggressive"
;  V42 cse1         [V42,T10] (  5,  2.50)    long  ->   x4         "CSE - moderate"
;  V43 cse2         [V43,T12] (  3,  1.50)    long  ->   x4         "CSE - moderate"
;
; Lcl frame size = 0

G_M55887_IG01:        ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
            stp     fp, lr, [sp,#-16]!
            mov     fp, sp
						;; bbWeight=1    PerfScore 1.50
G_M55887_IG02:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            ; byrRegs +[x0]
            cmp     x1, #4
            blo     G_M55887_IG08
						;; bbWeight=1    PerfScore 1.50
G_M55887_IG03:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            dup     v16.4s, w2
            lsl     x2, x1, #2
            and     x3, x2, #-32
            mov     x4, xzr
            cmp     x1, #8
            blo     G_M55887_IG05
						;; bbWeight=0.50 PerfScore 2.75
G_M55887_IG04:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            str     q16, [x0, x4]
            mov     x1, #16
            add     x1, x4, x1
            str     q16, [x0, x1]
            mov     x1, #32
            add     x4, x4, x1
            cmp     x4, x3
            blo     G_M55887_IG04
						;; bbWeight=4    PerfScore 22.00
G_M55887_IG05:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w2, #4, G_M55887_IG06
            str     q16, [x0, x4]
						;; bbWeight=0.50 PerfScore 1.00
G_M55887_IG06:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref
            movn    x1, #15
            add     x1, x2, x1
            str     q16, [x0, x1]
						;; bbWeight=0.50 PerfScore 1.00
G_M55887_IG07:        ; , epilog, nogc, extend
            ldp     fp, lr, [sp],#16
            ret     lr
						;; bbWeight=0.50 PerfScore 1.00
G_M55887_IG08:        ; gcVars=0000000000000000 {}, gcrefRegs=0000 {}, byrefRegs=0001 {x0}, gcvars, byref, isz
            mov     x3, xzr
            cmp     x1, #8
            blo     G_M55887_IG10
            and     x4, x1, #-8
						;; bbWeight=0.50 PerfScore 1.25
G_M55887_IG09:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            lsl     x5, x3, #2
            str     w2, [x0, x5]
            mov     x6, #4
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #8
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #12
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #16
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #20
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #24
            add     x6, x5, x6
            str     w2, [x0, x6]
            mov     x6, #28
            add     x5, x5, x6
            str     w2, [x0, x5]
            mov     x5, #8
            add     x3, x3, x5
            cmp     x3, x4
            blo     G_M55887_IG09
						;; bbWeight=4    PerfScore 74.00
G_M55887_IG10:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #2, G_M55887_IG11
            lsl     x4, x3, #2
            str     w2, [x0, x4]
            mov     x5, #4
            add     x5, x4, x5
            str     w2, [x0, x5]
            mov     x5, #8
            add     x5, x4, x5
            str     w2, [x0, x5]
            mov     x5, #12
            add     x4, x4, x5
            str     w2, [x0, x4]
            mov     x4, #4
            add     x3, x3, x4
						;; bbWeight=0.50 PerfScore 5.00
G_M55887_IG11:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #1, G_M55887_IG12
            lsl     x4, x3, #2
            str     w2, [x0, x4]
            mov     x5, #4
            add     x4, x4, x5
            str     w2, [x0, x4]
            mov     x4, #2
            add     x3, x3, x4
						;; bbWeight=0.50 PerfScore 3.00
G_M55887_IG12:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #0, G_M55887_IG13
            lsl     x1, x3, #2
            str     w2, [x0, x1]
						;; bbWeight=0.50 PerfScore 1.50
G_M55887_IG13:        ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
            ; byrRegs -[x0]
            ldp     fp, lr, [sp],#16
            ret     lr
						;; bbWeight=0.50 PerfScore 1.00

; Total bytes of code 332, prolog size 8, PerfScore 149.70, instruction count 83, allocated bytes for code 332 (MethodHash=f08325b0) for method System.SpanHelpers:Fill(byref,long,int)
; ============================================================

Unwind Info:
  >> Start offset   : 0x000000 (not in unwind data)
  >>   End offset   : 0xd1ffab1e (not in unwind data)
  Code Words        : 1
  Epilog Count      : 2
  E bit             : 0
  X bit             : 0
  Vers              : 0
  Function Length   : 83 (0x00053) Actual length = 332 (0x00014c)
  ---- Epilog scopes ----
  ---- Scope 0
  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
  Epilog Start Index         : 1 (0x01)
  ---- Scope 1
  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
  Epilog Start Index         : 1 (0x01)
  ---- Unwind codes ----
    E1          set_fp; mov fp, sp
    ---- Epilog start at index 1 ----
    81          save_fplr_x #1 (0x01); stp fp, lr, [sp, #-16]!
    E4          end
    E4          end

Changed text

Open file

G_M55887_IG01:        ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, nogc <-- Prolog IG
            stp     fp, lr, [sp,#-16]!
            mov     fp, sp
						;; bbWeight=1    PerfScore 1.50
G_M55887_IG02:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            ; byrRegs +[x0]
            cmp     x1, #4
            blo     G_M55887_IG08
						;; bbWeight=1    PerfScore 1.50
G_M55887_IG03:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            dup     v16.4s, w2
            lsl     x2, x1, #2
            and     x3, x2, #-32
            mov     x4, xzr
            cmp     x1, #8
            blo     G_M55887_IG05
						;; bbWeight=0.50 PerfScore 2.75
G_M55887_IG04:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            str     q16, [x0, x4]
            add     x1, x4, #16
            str     q16, [x0, x1]
            add     x4, x4, #32
            cmp     x4, x3
            blo     G_M55887_IG04
						;; bbWeight=4    PerfScore 18.00
G_M55887_IG05:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w2, #4, G_M55887_IG06
            str     q16, [x0, x4]
						;; bbWeight=0.50 PerfScore 1.00
G_M55887_IG06:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref
            sub     x1, x2, #16
            str     q16, [x0, x1]
						;; bbWeight=0.50 PerfScore 0.75
G_M55887_IG07:        ; , epilog, nogc, extend
            ldp     fp, lr, [sp],#16
            ret     lr
						;; bbWeight=0.50 PerfScore 1.00
G_M55887_IG08:        ; gcVars=0000000000000000 {}, gcrefRegs=0000 {}, byrefRegs=0001 {x0}, gcvars, byref, isz
            mov     x3, xzr
            cmp     x1, #8
            blo     G_M55887_IG10
            and     x4, x1, #-8
						;; bbWeight=0.50 PerfScore 1.25
G_M55887_IG09:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            lsl     x5, x3, #2
            str     w2, [x0, x5]
            add     x6, x5, #4
            str     w2, [x0, x6]
            add     x6, x5, #8
            str     w2, [x0, x6]
            add     x6, x5, #12
            str     w2, [x0, x6]
            add     x6, x5, #16
            str     w2, [x0, x6]
            add     x6, x5, #20
            str     w2, [x0, x6]
            add     x6, x5, #24
            str     w2, [x0, x6]
            add     x5, x5, #28
            str     w2, [x0, x5]
            add     x3, x3, #8
            cmp     x3, x4
            blo     G_M55887_IG09
						;; bbWeight=4    PerfScore 58.00
G_M55887_IG10:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #2, G_M55887_IG11
            lsl     x4, x3, #2
            str     w2, [x0, x4]
            add     x5, x4, #4
            str     w2, [x0, x5]
            add     x5, x4, #8
            str     w2, [x0, x5]
            add     x4, x4, #12
            str     w2, [x0, x4]
            add     x3, x3, #4
						;; bbWeight=0.50 PerfScore 4.00
G_M55887_IG11:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #1, G_M55887_IG12
            lsl     x4, x3, #2
            str     w2, [x0, x4]
            add     x4, x4, #4
            str     w2, [x0, x4]
            add     x3, x3, #2
						;; bbWeight=0.50 PerfScore 2.50
G_M55887_IG12:        ; gcrefRegs=0000 {}, byrefRegs=0001 {x0}, byref, isz
            tbz     w1, #0, G_M55887_IG13
            lsl     x1, x3, #2
            str     w2, [x0, x1]
						;; bbWeight=0.50 PerfScore 1.50
G_M55887_IG13:        ; gcrefRegs=0000 {}, byrefRegs=0000 {}, byref, epilog, nogc
            ; byrRegs -[x0]
            ldp     fp, lr, [sp],#16
            ret     lr
						;; bbWeight=0.50 PerfScore 1.00

; Total bytes of code 264, prolog size 8, PerfScore 121.15, instruction count 66, allocated bytes for code 264 (MethodHash=f08325b0) for method System.SpanHelpers:Fill(byref,long,int)
; ============================================================

Unwind Info:
  >> Start offset   : 0x000000 (not in unwind data)
  >>   End offset   : 0xd1ffab1e (not in unwind data)
  Code Words        : 1
  Epilog Count      : 2
  E bit             : 0
  X bit             : 0
  Vers              : 0
  Function Length   : 66 (0x00042) Actual length = 264 (0x000108)
  ---- Epilog scopes ----
  ---- Scope 0
  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
  Epilog Start Index         : 1 (0x01)
  ---- Scope 1
  Epilog Start Offset        : 3523193630 (0xd1ffab1e) Actual offset = 3523193630 (0xd1ffab1e) Offset from main function begin = 3523193630 (0xd1ffab1e)
  Epilog Start Index         : 1 (0x01)
  ---- Unwind codes ----
    E1          set_fp; mov fp, sp
    ---- Epilog start at index 1 ----
    81          save_fplr_x #1 (0x01); stp fp, lr, [sp, #-16]!
    E4          end
    E4          end