Summary: Blocks are numbered locally within a region, so numbering above the parent region is unnecessary.

Differential Revision: https://reviews.llvm.org/D77510

char8_t.

2c88a485.

Also extend it to cover memchr for consistency.

We had previously limited the shuffle(HORIZOP,HORIZOP) combine to binary shuffles, but we can often merge unary shuffles just as well, folding in UNDEF/ZERO values into the 64-bit half lanes.

For the (P)HADD/HSUB cases this is limited to fast-horizontal cases but PACKSS/PACKUS combines under all cases.

Make AsmPrinter messages on null structures consistent: use <<NULL ...>>.

Differential Revision: https://reviews.llvm.org/D77509

Summary: This updates the canonicalization documentation, and properly documents the different ways of canonicalizing operations.

Differential Revision: https://reviews.llvm.org/D77490

Summary:
This revision adds a section to WritingAPass to document the declarative specification, and how to use it.

Differential Revision: https://reviews.llvm.org/D77102

This patch builds upon D76140 by updating metadata on pointer typed
loads in inlined functions, when the load is the return value, and the
callsite contains return attributes which can be updated as metadata on
the load.
Added test cases show this for nonnull, dereferenceable,
dereferenceable_or_null

Reviewed-By: jdoerfert

Differential Revision: https://reviews.llvm.org/D76792

Previously line table symbol was represented as `DIE::value_iterator`
inside `DwarfCompileUnit` and subsequent function `intStmtList`
was used to create a local `MCSymbol` to initialize it.

This patch removes `DIE::value_iterator` from `DwarfCompileUnit`
and intoduce `MCSymbol` for representing this units symbol for
`debug_line` section. As a result `applyStmtList` is also modified
 to utilize this. Further more a helper function `getLineTableStartSym`
is also introduced to get this symbol, this would be used by clients
which need to access this line table, i.e `debug_macro`.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D77489

Even if this indicates in general a problem at call sites, the printer
is used for debugging and avoiding crashing is friendlier for example
when used in diagnostics or other printer.

Differential Revision: https://reviews.llvm.org/D77481

Instead of checking if each symlink exists before removing it,
remove the whole temp dir housing the symlinks before recreating it.
This is a bit shorter, conceptually simpler (in that the first
and consecutive test runs have more similar behavior), it's what we're
already doing in almost all places where we do it, and it works if the
symlink exists but is a dead link (e.g. when it points into the build
dir but the build dir is renamed).

No intended behavior change.

The newly-created constant zero will need an extra register to hold it
in the current statepoint lowering implementation. Remove it if there
exists one.

This fixes dead store warnings of the type "dead assignment" reported
by Clang Static Analyzer.

Summary:
This patch upstreams support the optional ARMv8.0 Data Gathering Hint (DGH)
extension, which adds the Data Gathering Hint instruction to the hint
space.

See ARMv8.0-DGH in the Arm Architecture Reference Manual Armv8 for more
information.

Reviewers: t.p.northover, rengolin, SjoerdMeijer, ab, danielkiss, samparker

Reviewed By: SjoerdMeijer

Subscribers: LukeGeeson, ostannard, kristof.beyls, hiraditya, danielkiss, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77097

Summary:
This patch upstreams support for the ARMv8.6A Enhanced Counter Virtualization
(ECV) extension, which adds 6 new system registers.

See ARMv8.6-ECV in the Arm Architecture Reference Manual Armv8 for more
information.

Reviewers: t.p.northover, rengolin, SjoerdMeijer, pcc, ab, chill

Reviewed By: SjoerdMeijer

Subscribers: LukeGeeson, ostannard, kristof.beyls, hiraditya, danielkiss, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77094

Add a pattern rewriter utility to erase blocks (while notifying the
pattern rewriting driver of the erased ops). Use this to remove trivial
else blocks in affine.if ops.

Differential Revision: https://reviews.llvm.org/D77083

As discussed in D76983, that patch can turn a chain of insert/extract
with scalar trunc ops into bitcast+extract and existing instcombine
vector transforms end up creating a shuffle out of that (see the
PhaseOrdering test for an example). Currently, that process requires
at least this sequence: -instcombine -early-cse -instcombine.

Before D76983, the sequence of insert/extract would reach the SLP
vectorizer and become a vector trunc there.

Based on a small sampling of public targets/types, converting the
shuffle to a trunc is better for codegen in most cases (and a
regression of that form is the reason this was noticed). The trunc is
clearly better for IR-level analysis as well.

This means that we can induce "spontaneous vectorization" without
invoking any explicit vectorizer passes (at least a vector cast op
may be created out of scalar casts), but that seems to be the right
choice given that we started with a chain of insert/extract, and the
backend would expand back to that chain if a target does not support
the op.

Differential Revision: https://reviews.llvm.org/D77299

The wrong name was confusing to read. value.getUsers() yields
Operation *s.

Differential Revision: https://reviews.llvm.org/D77486

Removing dead ops should make the outer loop of the pattern rewriting
driver run again. Although its operands are added to the worklist, if no
changes happenned to them or remaining ops in the worklist, the driver
wouldn't run once again - but it should be.

Differential Revision: https://reviews.llvm.org/D77483

Summary:
This patch upstreams support for the ARMv8.6A Fine Grain Traps (FGT)
extension, which adds 5 new system registers.

See ARMv8.6-FGT in the Arm Architecture Reference Manual Armv8 for more
information.

Reviewers: t.p.northover, rengolin, SjoerdMeijer, ab, momchil.velikov

Reviewed By: SjoerdMeijer

Subscribers: LukeGeeson, ostannard, kristof.beyls, hiraditya, danielkiss, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76991

This patch extends D77230. If we have a 'not' instruction inside a
negated expression, we can ignore extra uses of that op because the
negation has a one-to-one replacement: negate becomes increment.

Alive2 examples of the test cases:
http://volta.cs.utah.edu:8080/z/T5-u9P
http://volta.cs.utah.edu:8080/z/eT89L6

Differential Revision: https://reviews.llvm.org/D77459

The cmyk tests are based on the known regression that resulted from:
rGf2fbdf76

So this improvement in analysis might be enough to restore that commit.

Summary:
This patch upstreams v8.6A activity monitors virtualization
assembler support, which consists of 32 new system
registers (two groups, each with 16 numbered registers).

See ARMv8.6-AMU in the Arm Architecture Reference Manual Armv8 for more
information.

Reviewers: t.p.northover, rengolin, SjoerdMeijer, ab, john.brawn, ostannard

Reviewed By: ostannard

Subscribers: LukeGeeson, dnsampaio, ostannard, kristof.beyls, hiraditya, danielkiss, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76998

D51664 added Instruction::comesBefore which should provide better
performance than the manual check.

Reviewers: rnk, nikic, spatel

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D76228

This reverts commit 1580c76c.

This causes libcxx/selftest/newformat/sh.cpp/substitutions.sh.cpp to
fail with a linker error on Fedora 31 (x86-64) release (no assert)
builds.

This reverts commit 210f40fe.

Our existing combine allows to merge the shuffle of 2 similar 64-bit wide 'horizontal ops' (HADD/PACK/etc.) if the shuffle was a UNPCK/MOVSD.

This patch generalizes this to decode any target shuffle mask that can be widened to a 128-bit repeating v2*64 mask, which helps us catch PBLENDW/PBLENDD cases.

If we're packing from 128-bits to 64-bits then we don't need the RHS argument. This helps with register allocation, especially as we avoid repeating a use of the input value.

The ForOp::build ensures that there is a block terminator which is great for
the default use case when there are no iter_args and loop.for returns no
results.  In non-zero results case we always need to call replaceOpWithNewOp
which is not the nicest thing in the world. We can stop inserting YieldOp when
iter_args is non-empty. IfOp::build already behaves similarly.

Summary: This revision adds support for marking the last region as variadic in the ODS region list with the VariadicRegion directive.

Differential Revision: https://reviews.llvm.org/D77455

Differential Revision: https://reviews.llvm.org/D77458

Summary: Simplify some conditional statements.

Reviewers: jhenderson, MaskRay, rupprecht

Reviewed By: MaskRay, rupprecht

Subscribers: rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D75899

Summary: This test ensures that `llvm-nm` will omit NULL symbol.

Reviewers: jhenderson, MaskRay, grimar

Reviewed By: jhenderson, grimar

Subscribers: rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D76213