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diff --git a/content/zettel/1c2a2a.md b/content/zettel/1c2a2a.md new file mode 100644 index 0000000..1501c1e --- /dev/null +++ b/content/zettel/1c2a2a.md @@ -0,0 +1,22 @@ ++++ +title = "Dependency constraints" +author = "Yann Herklotz" +tags = [] +categories = [] +backlinks = ["1c2a2"] +forwardlinks = ["1c2a2b"] +zettelid = "1c2a2a" ++++ + +Data dependency constraints +: If there is a data dependency between two variables, then one cannot + be scheduled until the other has completed its execution. + +$$\forall (v_i, v_j) \in E_d, \mathit{sv}_{\mathit{end}} (v_i) -\mathit{sv}_{\mathit{beg}} (v_j) \le 0$$ + +Control dependency constraint +: Control dependencies are also set up, so that the instructions in + basic block $\mathit{bb}_j$ cannot be scheduled before instructions + in $\mathit{bb}_i$. + +$$\forall (\mathit{bb}_i, \mathit{bb}_j) \in E_c, \mathit{sv}_{\mathit{end}}(\mathit{ssnk} (\mathit{bb}_i)) - \mathit{sv}_{\mathit{beg}} (\mathit{ssrc}(\mathit{bb}_j)) \le 0$$ |