[LLVMdev] Last use of operand within BasicBlock?

[ryan baird]

Given an instruction and the basic block that it's in, is there an easy way
to tell if the operands are ever referenced after the instruction?

For example, if i have
...
%mul = mul nsw i32 %a, %val
%add = add nsw i32 %b, %val
...

And I'm iterating through this basic block, can I tell when I get to the
multiply instruction that another instruction is going to be using %val?

Since I'm running my code through reg2mem, I don't really care much about
other basicblocks (anything outside the basicblock should have an
eliminated phi instruction so it will be pulled from memory anyways).
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