Hello, > Can someone please help me getting the following information? > > 1) I would like to obtain the loop bounds (constant case) of all nested > loops > of a RTL insn. Is there a data structure over which I can iterate to get > bounds > for each nested loop of a RTL insn? > > 3) Can I determine if a pseudo register (RTX) is an induction variable > (linear) or not? > Which data structure gives me this information?
see loop-iv.c (or a bit improved version of it on killloop-branch). You can analyze induction variables and determine # of iterations of a loop using it, which should give you the information you need. But the rtl level iv analysis is not too powerful, just sufficiently for the current uses. > 2) Is there a way of determining sequences as mentioned in the paper > "Beyond Induction Variables: Detecting and Classifying Sequences Using a > Demand-Driven SSA From" by Gerlek, Stoltz and Wolfe? Not on RTL level. On tree level, see tree-scalar-evolutions.c > 4) At RTL level, array accesses convert to MEM expressions. I was > wondering > if I can obtain the source level array name from the MEM expression. You might be able to extract this information from MEM_EXPR. Zdenek
