[cfe-dev] "load groups" IR feature to improve C++ devirtualization

[Rafael Espíndola]

> where %group must be the result of a call to llvm.load.group. Any two loads
> with the same %group value are known to produce the same value. We can then
> choose to eliminate the latter of the loads as redundant in GVN, or in the
> event of high register pressure we could choose to reload without spilling
> to the stack.

What mark would GVN leave on the IR for the register allocator to use
when rematerializing the load?

> Nick

Cheers,
Rafael