(Are such blocks common or performance-painful on the public web?) On Jul 16, 2012, at 1:35 PM, "Henrique Santos" <[email protected]> wrote:
> Dear guys, > > I am trying to implement an optimization in IonMonkey that consists in > removing unreachable basic blocks. However, I am having problems to implement > it, because I do not know how to update the phi-functions once I remove a > block. For instance, if I have this program: > > L0: > v0 = 0 > goto L2 > > L1: > v1 = 1 > > L2: > v2 = phi(v0, v1) > print v2 > > I want to eliminate L1, and then the program would be like: > > L0: > v0 = 0 > goto L2: > > L2: > v2 = phi(v0, ??) > print v2 > > How can I update the phi-function v2 = phi(v0, v1)? I need to know from which > control flow edge the parameter v0 comes, so that I can add a copy like this: > > L2: > v2 = v0 > print v2 > > However, I do not know how to find from which edge v0 comes. Is there any > example of code in your repository in which basic blocks are removed? Or, > otherwise, is it possible to find out the correct parameter of a phi-function > that is associated with a CFG edge? > > Thank you very much, > > Henrique. > _______________________________________________ > dev-tech-js-engine-internals mailing list > [email protected] > https://lists.mozilla.org/listinfo/dev-tech-js-engine-internals _______________________________________________ dev-tech-js-engine-internals mailing list [email protected] https://lists.mozilla.org/listinfo/dev-tech-js-engine-internals
