InstCombine: Rudimentary support of shufflevector in SimplifyDemandedFPClass
This should look more like the computeKnownFPClass handling, with knowledge
of demanded vector elements.
InstCombine: Fix defining undef constant vector elts in SimplifyDemandedFPClass
Fold constants of known single class to the original constant instead of
a new constant. This avoids overdefining vector elements that were originally
undefined with the splat constant.
[mlir][Interfaces][NFC] Add `RegionBranchOpInterface` helper for forwarded values (#173981)
Add a helper function to compute a mapping of successor operands to
successor inputs. This mapping is computed in various places. Also add a
helper function to gather all region branch points.
This commit is in preparation of a bug fix / partial redesign of
`-remove-dead-values`. This commit also removes some duplicate code in
various places.
[VPlan] Handle addrspacecast/ptrtoaddr in VPlan-based cost model.
Also handle missing PtrToAddrs and AddrSpaceCast in
getCostForRecipeWithOpcode.
This makes sure all cast opcodes are handled, fixing a crash on loops
replicating addrspacecast and ptrtoaddrs.
