David Green
3d48775b89
[ARM] Reassociate BFI
...
D104868 removed an (incorrect) fold for distributing BFI instructions in
a chain, combining them into a single instruction. BFIs like that are
hard to test, as the patterns are often destroyed before they become
BFIs. But it can come up in places, with chains of BFIs that can be
combined.
This patch adds a replacement, which reassociates BFI instructions with
non-overlapping insertion masks so that low bits are inserted first.
This can end up sorting the nodes so that adjacent inserts are next to
one another, allowing the existing folds to combine into a single BFI.
Differential Revision: https://reviews.llvm.org/D105096
2021-07-01 21:08:13 +01:00
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