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diff --git a/content/zettel/1c4b1.md b/content/zettel/1c4b1.md new file mode 100644 index 0000000..63fddf5 --- /dev/null +++ b/content/zettel/1c4b1.md @@ -0,0 +1,20 @@ ++++ +title = "Stability of MAC optimisation in Vericert" +date = "2022-11-09" +author = "Yann Herklotz" +tags = [] +categories = [] +backlinks = ["1c4b"] +forwardlinks = ["5b3"] +zettelid = "1c4b1" ++++ + +MAC Optimisations ([\#5b3]) for a fused multiply-add operation is not +very stable, because if the intermediate register is used anywhere else, +then it will not be able to fuse the two instructions. This means that +from a local perspective it looks quite random whether or not a series +of multipliers and adds are actually fused. The decision needs a global +property of whether that register is used anywhere, which means that it +is quite unreliable if it will fire or not. + + [\#5b3]: /zettel/5b3 |