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diff --git a/content/zettel/3a8b.md b/content/zettel/3a8b.md new file mode 100644 index 0000000..bbd07ec --- /dev/null +++ b/content/zettel/3a8b.md @@ -0,0 +1,19 @@ ++++ +title = "Maximal and minimal phi" +author = "Yann Herklotz" +tags = [] +categories = [] +backlinks = ["3a8a"] +forwardlinks = ["3a8c"] +zettelid = "3a8b" ++++ + +There are several ways in which one can generate correct SSA programs +with phi functions. One can either just generate them with phi nodes at +each entrance to a block, or generate them only when they are necessary. +In the former case, the number of phi functions means that many +optimisations are hindered and will not work optimally. + +To generate phi functions only when they are necessary, we only need to +generate them where the join point can be reached by two different +control flows with distinct definition points of the variable. |