With this patch an undefined mask in a shufflevector will be printed as poison.
This change is done to support the new shufflevector semantics
for undefined mask elements.
Differential Revision: https://reviews.llvm.org/D149210
Previously only the very first gather/buildvector node might be probed for reshuffling of other nodes.
But the compiler may do the same for other gather/buildvector nodes too, just need to check the
dependency and postpone the emission of the dependent nodes, if the origin nodes were not emitted yet.
Part of D110978
Differential Revision: https://reviews.llvm.org/D144958
This caused verifier errors:
Instruction does not dominate all uses!
%8 = insertelement <2 x i64> %7, i64 %pgocount1330, i64 1
%15 = shufflevector <2 x i64> %8, <2 x i64> poison, <2 x i32> <i32 1, i32 1>
in function ?NearestInclusiveAncestorAssignedToSlot@SlotScopedTraversal@blink@@SAPAVElement@2@ABV32@@Z
(or register allocator crash when the verifier was disabled).
See comment on the code review.
> Previously only the very first gather/buildvector node might be probed for reshuffling of other nodes.
> But the compiler may do the same for other gather/buildvector nodes too, just need to check the
> dependency and postpone the emission of the dependent nodes, if the origin nodes were not emitted yet.
>
> Part of D110978
>
> Differential Revision: https://reviews.llvm.org/D144958
This reverts commit a611b3f3059e4c3b9e7b914091c3edaef099fd5d.
It also reverts 7a4061ae372b3262703ffeea3b64db89187db611 which depended on the above.
Previously only the very first gather/buildvector node might be probed for reshuffling of other nodes.
But the compiler may do the same for other gather/buildvector nodes too, just need to check the
dependency and postpone the emission of the dependent nodes, if the origin nodes were not emitted yet.
Part of D110978
Differential Revision: https://reviews.llvm.org/D144958
Make a separate routine for GEPs cost calculation and make
the approach uniform across load, store and GEP tree nodes.
Additional issue fixed is GEP cost savings were applied twice
for ScatterVectorize nodes (aka gather load) making them look
unrealistically profitable for vectorization.
Differential Revision: https://reviews.llvm.org/D140789
Gather nodes are vectorized as simply vector of the scalars instead of
relying on the actual node. It leads to the fact that in some cases
we may miss incorrect transformation (non-matching set of scalars is
just ended as a gather node instead of possible vector/gather node).
Better to rely on the actual nodes, it allows to improve stability and
better detect missed cases.
Differential Revision: https://reviews.llvm.org/D135174
Gather nodes are vectorized as simply vector of the scalars instead of
relying on the actual node. It leads to the fact that in some cases
we may miss incorrect transformation (non-matching set of scalars is
just ended as a gather node instead of possible vector/gather node).
Better to rely on the actual nodes, it allows to improve stability and
better detect missed cases.
Differential Revision: https://reviews.llvm.org/D135174
Freeze instruction in some cases makes codegen worse, so need to be very
careful when emitting it. Instead improve analysis in isUndefVector
function to generate mask of unused elements and use it in the analysis.
Differential Revision: https://reviews.llvm.org/D135382
The pointer operands for the ScatterVectorize node may contain
non-instruction values and they are not checked for "already being
vectorized". Need to check that such pointers are already vectorized and
gather them instead of trying to build vectorize node to avoid compiler
crash.
Differential Revision: https://reviews.llvm.org/D132949
