Merging CPU cores

I have an idea to increase single-thread performance.
CPU cores should be merged into one macrocore which give any core any available resources.
Example: you want to multiply 100 vectors in one non-multithreaded function.
Normally:one core will execute the operations using its own resources.
With macrocore:the multiplication will be assigned to all available SIMD/FPU/ALU units in the macrocore(all core units).

>>5
Of course there are unfortunately going to be restrictive security features, but I was talking about microarchitecture.

also, CPUs soldered straight to the motherboard
Your point is? A lot of mobile applications are space-constrained enough that a socket would be unnecessarily large.