https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24021
--- Comment #18 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- I'm wondering whether it is possible to check on actual code what is needed. For instance, assume that you have a program that produces always the same results, e.g. by running it over a fixed dataset. GCC could get some information about actual FP values (a bit like profile generation). Then check what benefit you can get by using these data at compile time (contrary to optimization with profile use, you assume here that the obtained information is necessarily valid, which is true as long as the program is run on the chosen dataset). The difficulty is to find whether some benefit can be obtained by VRP, but this should give an upper bound on the speedup you can hope to get. So perhaps this can give some useful information about what to focus on.
