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diff --git a/content/zettel/3a8a2.md b/content/zettel/3a8a2.md new file mode 100644 index 0000000..a48882b --- /dev/null +++ b/content/zettel/3a8a2.md @@ -0,0 +1,20 @@ ++++ +title = "Parallel semantics of phi functions" +author = "Yann Herklotz" +tags = [] +categories = [] +backlinks = ["3a8a1"] +forwardlinks = ["3a8a3"] +zettelid = "3a8a2" ++++ + +The semantics of the phi instructions are parallel, which means that +they all use the same starting state as input, and then update the +registers based on that that phi instruction. Modelling of the phi +instructions as a sequential update is not performed. + +There are some cases, however, where the sequential execution of phi +instructions does not lead to equivalent behaviour as the parallel +execution of the instructions. There are then optimisations that can +take advantage of this, and that the inputs and outputs of the phi +instructions are independent. |