Try/catch vs NaN

gistfile1.txt

function t1(x::Float64)
   if x == 100_000_000 throw(DomainError()); end
   return x;
end

function t2(x::Float64)
   if x == 100_000_000
      return NaN;
   else
      return x;
   end
end

function ttc1()
   x::Float64 = 1;
   try
      for i = 1:100_000_000
         x = x + t1(Float64(i));
      end
   catch e
      println(e);
   end
   println("x = ",x);
end

function ttc2()
   x::Float64 = 1;
   for i = 1:99_999_999
      x = x + t2(Float64(i));
   end
   println("x = ",x);
end

gistfile2.txt

julia> code_native(t1,(Float64,))
      .section        __TEXT,__text,regular,pure_instructions
Filename: /Users/jeffw/src/errata/julia/tc.jl
Source line: 2
        push    RBP
        mov     RBP, RSP
        movabs  RAX, 4379473120
Source line: 2
        vucomisd        XMM0, QWORD PTR [RAX]
        jne     L35
        jp      L35
        jmpq    L37
Source line: 3
L35:    pop     RBP
        ret
Source line: 2
L37:    movabs  RAX, jl_throw_with_superfluous_argument
        movabs  RDI, 140382533282848
        mov     ESI, 2
        call    RAX

julia> code_native(t2,(Float64,1))
ERROR: `code_native` has no method matching code_native(::Function, ::(DataType,Int64))

julia> code_native(t2,(Float64,))
      .section        __TEXT,__text,regular,pure_instructions
Filename: /Users/jeffw/src/errata/julia/tc.jl
Source line: 7
        push    RBP
        mov     RBP, RSP
        movabs  RAX, 4379476112
Source line: 7
        vucomisd        XMM0, QWORD PTR [RAX]
        jne     L44
        jp      L44
        movabs  RAX, 4379476120
        vmovsd  XMM0, QWORD PTR [RAX]
Source line: 10
L44:    pop     RBP
        ret