[LLVMdev] NO-OP

[Fernando Magno Quintao Pereira]

> Why do you want to do this?  Empty MBBs are valid, and it's probably
> better to have your code handle them.

Currently, that is the solution. I have a special treatment for empty 
basic blocks. I think the code would be more homogeneous if there were no 
empty basic blocks.

>
> There is a NOP "instruction" on x86, equivalent to XCHG EAX, EAX.

The problem with xchk EAX, EAX is that is uses registers, and it would 
add a small burden on the register allocator.

Fernando