This adds support for scalarizing these intrinsics as well the X86TargetTransformInfo support to avoid scalarizing them in the cases X86 can handle.
I've omitted handling special cases for constant masks for this first pass. Though CodeGenPrepare can constant fold the branch conditions and remove some of the control flow anyway.
Fixes PR40994 and is covers most of PR3666. Might want to implement constant masks to close that.
Differential Revision: https://reviews.llvm.org/D59180
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This saves needing to call getInt32 ourselves. Making the code a little shorter.
The test changes are because insert/extract use getInt64 internally. Shouldn't be a functional issue.
This cleanup because I plan to write similar code for expandload/compressstore.
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There are special cases in the scalarization for constant masks. If we hit one of the special cases we don't need to reset the iteration.
Noticed while starting work on adding expandload/compressstore to this pass.
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to reflect the new license.
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entirely to discuss the new license. We checked this carefully with the
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This pass doesn't handle non-byte sized types correctly at all, but at least we can make byte sized types work.
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Its possible the mask itself or one of the elements is a ConstantExpr and we shouldn't optimize in that case.
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This shouldn't really happen in practice I hope, but we tried to handle other constant cases. We missed this one because we checked for ConstantVector without realizing that zero becomes ConstantAggregateZero instead.
So instead just check for Constant and use getAggregateElement which will do the dirty work for us.
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Had we emitted this IR earlier, InstCombine would have removed icmp so I'm going to assume using the i1 directly would be considered canonical.
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Summary:
The pass is supposed to scalarize such intrinsics if the target does not support
them natively, so if the scalarization does not happen instruction selection
crashes due to inability to lower these intrinsics.
Reviewers: andrew.w.kaylor, craig.topper
Reviewed By: andrew.w.kaylor
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D45947
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All these headers already depend on CodeGen headers so moving them into
CodeGen fixes the layering (since CodeGen depends on Target, not the
other way around).
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Many of these uses can get by with forward declarations. Hopefully this
speeds up compilation after adding a single intrinsic.
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Rename the DEBUG_TYPE to match the names of corresponding passes where
it makes sense. Also establish the pattern of simply referencing
DEBUG_TYPE instead of repeating the passname where possible.
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Currently, when masked load, store, gather or scatter intrinsics are used, we check in CodeGenPrepare pass if the subtarget support these intrinsics, if not we replace them with scalar code - this is a functional transformation not an optimization (not optional).
CodeGenPrepare pass does not run when the optimization level is set to CodeGenOpt::None (-O0).
Functional transformation should run with all optimization levels, so here I created a new pass which runs on all optimization levels and does no more than this transformation.
Differential Revision: https://reviews.llvm.org/D32487
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