Force LDC/LLVM to split a struct local (into registers)?

[Vladimir Panteleev]

Hi,

This change increases the function's execution time by 50%:

https://github.com/CyberShadow/chunker/commit/inline-hash

To reproduce, get the code and run:

ldmd2 -Isrc -i -g -version=benchmarkChunker -O -inline -release 
-run src/chunker/package -N=100 Chunker

It looks like LLVM is keeping the fields on the stack, and isn't 
realizing that splitting the struct to move some fields into 
registers will result in faster code.

Is there something in the code preventing it from doing so? Or, 
is there a way to force it to split the struct?