Operator overloading leads to bad code optimization

[claptrap]

Just a simple function to split a bezier in two.

Using "-O3"

LDC the operator version is 84 instructions
LDC the hand expanded math is 49 instructions.

It seems something as simple as this should be better optimised? 
Or am I missing something?

https://godbolt.org/z/4h9vob3Yo

In fact there's quite a few bits where it looks like completely 
redundant code is left in? Eg...

123 movss   dword ptr [rsp - 24], xmm1
124 movss   xmm0, dword ptr [rip + .LCPI4_0]
125 mulss   xmm1, xmm0
126 movss   dword ptr [rsp - 24], xmm1


137 movss   dword ptr [rsp - 24], xmm2
138 mulss   xmm2, xmm0
139 movss   dword ptr [rsp - 24], xmm2