Rust vs C++

msvc32.asm

nl::bench::recurse_sub:
009312E0  push        ebp  
009312E1  mov         ebp,esp  
009312E3  and         esp,0FFFFFFF8h  
009312E6  sub         esp,14h  
009312E9  mov         eax,dword ptr [ebp+8]  
009312EC  push        ebx  
009312ED  push        esi  
009312EE  push        edi  
009312EF  mov         ebx,dword ptr [eax]  
009312F1  mov         edi,1  
009312F6  mov         edx,dword ptr [eax+4]  
009312F9  mov         dword ptr [esp+14h],ecx  
009312FD  mov         dword ptr [esp+10h],edx  
00931301  test        ebx,ebx  
00931303  jne         00931309  
00931305  xor         esi,esi  
00931307  jmp         00931315  
00931309  mov         eax,dword ptr [ebx+4]  
0093130C  lea         ecx,[eax+eax*4]  
0093130F  mov         eax,dword ptr [edx+4]  
00931312  lea         esi,[eax+ecx*4]  
00931315  test        ebx,ebx  
00931317  je          0093132F  
00931319  movzx       eax,word ptr [ebx+8]  
0093131D  add         eax,dword ptr [ebx+4]  
00931320  lea         ecx,[eax+eax*4]  
00931323  mov         eax,dword ptr [ebp+8]  
00931326  mov         eax,dword ptr [eax+4]  
00931329  mov         eax,dword ptr [eax+4]  
0093132C  lea         ebx,[eax+ecx*4]  
0093132F  cmp         esi,ebx  
00931331  je          00931356  
00931333  mov         ecx,dword ptr [esp+14h]  
00931337  lea         eax,[esp+18h]  
0093133B  push        eax  
0093133C  mov         dword ptr [esp+1Ch],esi  
00931340  mov         dword ptr [esp+20h],edx  
00931344  call        009312E0  
00931349  mov         edx,dword ptr [esp+10h]  
0093134D  add         esi,14h  
00931350  add         edi,eax  
00931352  cmp         esi,ebx  
00931354  jne         00931333  
00931356  mov         eax,edi  
00931358  pop         edi  
00931359  pop         esi  
0093135A  pop         ebx  
0093135B  mov         esp,ebp  
0093135D  pop         ebp  
0093135E  ret         4  

msvc64.asm

nl::bench::recurse_sub:
00007FF692D01220  mov         qword ptr [rsp+10h],rbx  
00007FF692D01225  mov         qword ptr [rsp+18h],rbp  
00007FF692D0122A  mov         qword ptr [rsp+20h],rsi  
00007FF692D0122F  mov         qword ptr [rsp+8],rcx  
00007FF692D01234  push        rdi  
00007FF692D01235  sub         rsp,30h  
00007FF692D01239  mov         r8,qword ptr [rdx]  
00007FF692D0123C  mov         rbp,qword ptr [rdx+8]  
00007FF692D01240  xor         esi,esi  
00007FF692D01242  mov         r9,rdx  
00007FF692D01245  mov         r10,rcx  
00007FF692D01248  mov         edi,1  
00007FF692D0124D  test        r8,r8  
00007FF692D01250  jne         00007FF692D01256  
00007FF692D01252  mov         ebx,esi  
00007FF692D01254  jmp         00007FF692D01266  
00007FF692D01256  mov         eax,dword ptr [r8+4]  
00007FF692D0125A  lea         rcx,[rax+rax*4]  
00007FF692D0125E  mov         rax,qword ptr [rbp+8]  
00007FF692D01262  lea         rbx,[rax+rcx*4]  
00007FF692D01266  test        r8,r8  
00007FF692D01269  je          00007FF692D01287  
00007FF692D0126B  mov         eax,dword ptr [r8+4]  
00007FF692D0126F  movzx       ecx,word ptr [r8+8]  
00007FF692D01274  add         rcx,rax  
00007FF692D01277  mov         rax,qword ptr [r9+8]  
00007FF692D0127B  lea         rdx,[rcx+rcx*4]  
00007FF692D0127F  mov         rcx,qword ptr [rax+8]  
00007FF692D01283  lea         rsi,[rcx+rdx*4]  
00007FF692D01287  cmp         rbx,rsi  
00007FF692D0128A  je          00007FF692D012B8  
00007FF692D0128C  nop         dword ptr [rax]  
00007FF692D01290  lea         rdx,[rsp+20h]  
00007FF692D01295  mov         rcx,r10  
00007FF692D01298  mov         qword ptr [rsp+20h],rbx  
00007FF692D0129D  mov         qword ptr [rsp+28h],rbp  
00007FF692D012A2  call        00007FF692D01220  
00007FF692D012A7  mov         r10,qword ptr [rsp+40h]  
00007FF692D012AC  add         rbx,14h  
00007FF692D012B0  add         rdi,rax  
00007FF692D012B3  cmp         rbx,rsi  
00007FF692D012B6  jne         00007FF692D01290  
00007FF692D012B8  mov         rbx,qword ptr [rsp+48h]  
00007FF692D012BD  mov         rbp,qword ptr [rsp+50h]  
00007FF692D012C2  mov         rsi,qword ptr [rsp+58h]  
00007FF692D012C7  mov         rax,rdi  
00007FF692D012CA  add         rsp,30h  
00007FF692D012CE  pop         rdi  
00007FF692D012CF  ret  

rust.asm

	.def	 __ZN7recurse20h9b5fad914f8cd2f5Gka4v0.0E;
	.scl	3;
	.type	32;
	.endef
	.align	16, 0x90
__ZN7recurse20h9b5fad914f8cd2f5Gka4v0.0E:
	.cfi_startproc
	cmp	esp, dword ptr fs:[20]
	ja	LBB3_2
	push	4
	push	20
	call	___morestack
	ret
LBB3_2:
	push	ebp
Ltmp1:
	.cfi_def_cfa_offset 8
	push	ebx
Ltmp2:
	.cfi_def_cfa_offset 12
	push	edi
Ltmp3:
	.cfi_def_cfa_offset 16
	push	esi
Ltmp4:
	.cfi_def_cfa_offset 20
	push	eax
Ltmp5:
	.cfi_def_cfa_offset 24
Ltmp6:
	.cfi_offset esi, -20
Ltmp7:
	.cfi_offset edi, -16
Ltmp8:
	.cfi_offset ebx, -12
Ltmp9:
	.cfi_offset ebp, -8
	mov	esi, edx
	mov	edi, 1
	test	si, si
	je	LBB3_5
	mov	ebx, dword ptr [esp + 24]
	mov	eax, dword ptr [ebx + 8]
	imul	ecx, ecx, 20
	lea	ebp, dword ptr [eax + ecx + 8]
	mov	edi, 1
	.align	16, 0x90
LBB3_4:
	mov	ecx, dword ptr [ebp - 4]
	movzx	edx, word ptr [ebp]
	mov	dword ptr [esp], ebx
	call	__ZN7recurse20h9b5fad914f8cd2f5Gka4v0.0E
	add	edi, eax
	add	ebp, 20
	dec	si
	jne	LBB3_4
LBB3_5:
	mov	eax, edi
	add	esp, 4
	pop	esi
	pop	edi
	pop	ebx
	pop	ebp
	ret
	.cfi_endproc