;;; Windows (return via hidden byref)
       488D4C2428           lea      rcx, bword ptr [rsp+28H]    ;; address of return byref
       448BC3               mov      r8d, ebx
       33D2                 xor      edx, edx
       E863FBFFFF           call     TreeNode:bottomUpTree(int,int):struct
       488D4C2428           lea      rcx, bword ptr [rsp+28H]
       E869FBFFFF           call     TreeNode:itemCheck():int:this

;;; Linux (return in register pair)
       418BF7               mov      esi, r15d
       33FF                 xor      edi, edi
       E85BFBFFFF           call     TreeNode:bottomUpTree(int,int):struct
       48894598             mov      gword ptr [rbp-68H], rax       ;; spill return to temp
       488955A0             mov      qword ptr [rbp-60H], rdx
       488D7D98             lea      rdi, bword ptr [rbp-68H]       ;; copy temp to another temp
       488B07               mov      rax, gword ptr [rdi]
       488945B0             mov      gword ptr [rbp-50H], rax
       8B7F08               mov      edi, dword ptr [rdi+8]
       897DB8               mov      dword ptr [rbp-48H], edi
       488D7DB0             lea      rdi, bword ptr [rbp-50H]       ;; pass 2nd temp to itemCheck
       E849FBFFFF           call     TreeNode:itemCheck():int:this

;; prolog: zero from rbp-28H to rbp-88H
       488DBD78FFFFFF       lea      rdi, [rbp-88H]
       B918000000           mov      ecx, 24
       33C0                 xor      rax, rax
       F3AB                 rep stosd 

;; later: re-zero part of the range
       488D7DB8             lea      rdi, bword ptr [rbp-48H]

G_M53682_IG03:
       660F57C0             xorpd    xmm0, xmm0
       F30F7F07             movdqu   qword ptr [rdi], xmm0

;; later: re-zero another part, overwrite it (partially with a zero),
;; then immediately read & return the values just written as a pair
       488D45C8             lea      rax, bword ptr [rbp-38H]

G_M53682_IG09:
       660F57C0             xorpd    xmm0, xmm0
       F30F7F00             movdqu   qword ptr [rax], xmm0

G_M53682_IG10:
       895DD0               mov      dword ptr [rbp-30H], ebx
       33C0                 xor      rax, rax
       488945C8             mov      gword ptr [rbp-38H], rax
       488B45C8             mov      rax, gword ptr [rbp-38H]
       488B55D0             mov      rdx, qword ptr [rbp-30H]

G_M53682_IG11:
       488D65D8             lea      rsp, [rbp-28H]
       5B                   pop      rbx
       415C                 pop      r12
       415D                 pop      r13
       415E                 pop      r14
       415F                 pop      r15
       5D                   pop      rbp
       C3                   ret      

   movsx   rdx, ebx
   lea     rsp, ...
   ...
   ret