> On 2/12/07, Jiahua He <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I am reading the code of autovect branch and curious about how to deal > > with the dependencies of virtual defs/uses. In the function > > vect_analyze_scalar_cycles( ), I found the statement "Skip virtual > > phi's. The data dependences that are associated with virtual defs/uses > > ( i.e., memory accesses) are analyzed elsewhere." But where is the > > code? I tried to search for "vect_induction_def" and > > "vect_reduction_def" and found that they are not used to assign > > elsewhere. Is the analysis not implemented yet? Thanks in advance! > > They show up as data references because of tree-data-reference.c marking them. > At lets, that's how other linear loop transforms handles it. > Not sure about how vectorizer deals with it specifically >
We don't analyze the def-use cycles created by virtual defs/uses. We make sure that any stmt in the loop that has virtual defs/uses associated with it is a load/store stmt (i.e. has a dataref in its rhs/lhs), and then, separately, we make sure we can analyze all the datarefs in the loop and compute the dependence relations between them. dorit > > > > Jiahua > >
