Cleanup includes: TransformsUtils

Estimation on the impact on preprocessor output:
before: 1065307662
after: 1064800684

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-

Cleanup includes: TransformsUtils

Estimation on the impact on preprocessor output:
before: 1065307662
after: 1064800684

Discourse thread: https://discourse.llvm.org/t/include-what-you-use-include-cleanup
Differential Revision: https://reviews.llvm.org/D120741

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[NFC] Remove unnecessary #includes

An attempt to reduce the number of files that are recompiled due to a change.

Differential Revision: https://reviews.llvm.org/D119055

Silence a few unused variable warnings. NFC.

Fix typo s/beloinging/belonging

Differential Revision: https://reviews.llvm.org/D107099

[NewPM] Don't mark AA analyses as preserved

Currently all AA analyses marked as preserved are stateless, not taking
into account their dependent analyses. So there's no need to mark them
as preserve

[NewPM] Don't mark AA analyses as preserved

Currently all AA analyses marked as preserved are stateless, not taking
into account their dependent analyses. So there's no need to mark them
as preserved, they won't be invalidated unless their analyses are.

SCEVAAResults was the one exception to this, it was treated like a
typical analysis result. Make it like the others and don't invalidate
unless SCEV is invalidated.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D102032

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[DebugInfo] Move the findDbg* functions into DebugInfo.cpp

Move the findDbg* functions into lib/IR/DebugInfo.cpp from
lib/Transforms/Utils/Local.cpp.

D99169 adds a call to a function (findDbgUsers)

[DebugInfo] Move the findDbg* functions into DebugInfo.cpp

Move the findDbg* functions into lib/IR/DebugInfo.cpp from
lib/Transforms/Utils/Local.cpp.

D99169 adds a call to a function (findDbgUsers) that lives in
lib/Transforms/Utils/Local.cpp (LLVMTransformUtils) from lib/IR/Value.cpp
(LLVMCore). The Core lib doesn't include TransformUtils. The builtbots caught
this here: https://lab.llvm.org/buildbot/#/builders/109/builds/12664. This patch
moves the function, and the 3 similar ones for consistency, into DebugInfo.cpp
which is part of LLVMCore.

Reviewed By: dblaikie, rnk

Differential Revision: https://reviews.llvm.org/D100632

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[DebugInfo] Support DIArgList in DbgVariableIntrinsic

This patch updates DbgVariableIntrinsics to support use of a DIArgList for the
location operand, resulting in a significant change to its interf

[DebugInfo] Support DIArgList in DbgVariableIntrinsic

This patch updates DbgVariableIntrinsics to support use of a DIArgList for the
location operand, resulting in a significant change to its interface. This patch
does not update all IR passes to support multiple location operands in a
dbg.value; the only change is to update the DbgVariableIntrinsic interface and
its uses. All code outside of the intrinsic classes assumes that an intrinsic
will always have exactly one location operand; they will still support
DIArgLists, but only if they contain exactly one Value.

Among other changes, the setOperand and setArgOperand functions in
DbgVariableIntrinsic have been made private. This is to prevent code from
setting the operands of these intrinsics directly, which could easily result in
incorrect/invalid operands being set. This does not prevent these functions from
being called on a debug intrinsic at all, as they can still be called on any
CallInst pointer; it is assumed that any code directly setting the operands on a
generic call instruction is doing so safely. The intention for making these
functions private is to prevent DIArgLists from being overwritten by code that's
naively trying to replace one of the Values it points to, and also to fail fast
if a DbgVariableIntrinsic is updated to use a DIArgList without a valid
corresponding DIExpression.

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[llvm] Construct SmallVector with iterator ranges (NFC)

[DebugInfo] Avoid re-ordering assignments in LCSSA

The LCSSA pass makes use of a function insertDebugValuesForPHIs() to
propogate dbg.value() intrinsics to newly inserted PHI instructions. Faulty
be

[DebugInfo] Avoid re-ordering assignments in LCSSA

The LCSSA pass makes use of a function insertDebugValuesForPHIs() to
propogate dbg.value() intrinsics to newly inserted PHI instructions. Faulty
behaviour occurs when the parent PHI of a newly inserted PHI is not the
most recent assignment to a source variable. insertDebugValuesForPHIs ends
up propagating a value that isn't the most recent assignemnt.

This change removes the call to insertDebugValuesForPHIs() from LCSSA,
preventing incorrect dbg.value intrinsics from being propagated.
Propagating variable locations between blocks will occur later, during
LiveDebugValues.

Differential Revision: https://reviews.llvm.org/D92576

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[LCSSA] Doc for special treatment of PHIs

Differential Revision: https://reviews.llvm.org/D89739

[LCSSA] Provide option for caller to clean up unused PHIs.

formLCSSAForInstructions is used by SCEVExpander, which tracks all
inserted instructions including LCSSA phis using asserting value
handles

[LCSSA] Provide option for caller to clean up unused PHIs.

formLCSSAForInstructions is used by SCEVExpander, which tracks all
inserted instructions including LCSSA phis using asserting value
handles. This means cleanup needs to happen in the caller.

Extend formLCSSAForInstructions to take an optional pointer to a
vector. If this argument is non-nullptr, instead of directly deleting
the phis, add them to the vector, so the caller can process them.

This should address various PPC buildbot failures, including
http://lab.llvm.org:8011/builders/clang-ppc64be-linux-lnt/builds/40567

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[LCSSA] Use IRBuilder for PHI creation.

Use IRBuilder instead PHINode::Create. This should not impact the
generated code, but IRBuilder provides a way to register callbacks for
inserted instructions

[LCSSA] Use IRBuilder for PHI creation.

Use IRBuilder instead PHINode::Create. This should not impact the
generated code, but IRBuilder provides a way to register callbacks for
inserted instructions, which is convenient for some users.

Reviewed By: lebedev.ri

Differential Revision: https://reviews.llvm.org/D85037

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[NFC] Add missing 'const' notion to LCSSA-related functions

These functions don't really do any changes to loop info or
dominator tree. We should state this explicitly using 'const'.

[LCSSA] Don't use VH callbacks to invalidate SCEV when creating LCSSA phis

In general ValueHandleBase::ValueIsRAUWd shouldn't be called when not
all uses of the value were actually replaced, though,

[LCSSA] Don't use VH callbacks to invalidate SCEV when creating LCSSA phis

In general ValueHandleBase::ValueIsRAUWd shouldn't be called when not
all uses of the value were actually replaced, though, currently
formLCSSAForInstructions calls it when it inserts LCSSA-phis.

Calls of ValueHandleBase::ValueIsRAUWd were added to LCSSA specifically
to update/invalidate SCEV. In the best case these calls duplicate some
of the work already done by SE->forgetValue, though in case when SCEV of
the value is SCEVUnknown, SCEV replaces the underlying value of
SCEVUnknown with the new value (i.e. acts like LCSSA-phi actually fully
replaces the value it is created for), which leads to SCEV being
corrupted because LCSSA-phi rarely dominates all uses of its inputs.

Fixes bug https://bugs.llvm.org/show_bug.cgi?id=44058.

Reviewers: fhahn, efriedma, reames, sanjoy.google

Reviewed By: fhahn

Subscribers: hiraditya, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70593

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Add missing includes needed to prune LLVMContext.h include, NFC

These are a pre-requisite to removing #include "llvm/Support/Options.h"
from LLVMContext.h: https://reviews.llvm.org/D70280

Sink all InitializePasses.h includes

This file lists every pass in LLVM, and is included by Pass.h, which is
very popular. Every time we add, remove, or rename a pass in LLVM, it
caused lots of reco

Sink all InitializePasses.h includes

This file lists every pass in LLVM, and is included by Pass.h, which is
very popular. Every time we add, remove, or rename a pass in LLVM, it
caused lots of recompilation.

I found this fact by looking at this table, which is sorted by the
number of times a file was changed over the last 100,000 git commits
multiplied by the number of object files that depend on it in the
current checkout:
recompiles touches affected_files header
342380 95 3604 llvm/include/llvm/ADT/STLExtras.h
314730 234 1345 llvm/include/llvm/InitializePasses.h
307036 118 2602 llvm/include/llvm/ADT/APInt.h
213049 59 3611 llvm/include/llvm/Support/MathExtras.h
170422 47 3626 llvm/include/llvm/Support/Compiler.h
162225 45 3605 llvm/include/llvm/ADT/Optional.h
158319 63 2513 llvm/include/llvm/ADT/Triple.h
140322 39 3598 llvm/include/llvm/ADT/StringRef.h
137647 59 2333 llvm/include/llvm/Support/Error.h
131619 73 1803 llvm/include/llvm/Support/FileSystem.h

Before this change, touching InitializePasses.h would cause 1345 files
to recompile. After this change, touching it only causes 550 compiles in
an incremental rebuild.

Reviewers: bkramer, asbirlea, bollu, jdoerfert

Differential Revision: https://reviews.llvm.org/D70211

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[LCSSA] Forget values we create LCSSA phis for

Summary:
Currently we only forget the loop we added LCSSA phis for. But SCEV
expressions in other loops could also depend on the instruction we added
a

[LCSSA] Forget values we create LCSSA phis for

Summary:
Currently we only forget the loop we added LCSSA phis for. But SCEV
expressions in other loops could also depend on the instruction we added
a PHI for and currently we do not invalidate those expressions. This can
happen when we use ScalarEvolution before converting a function to LCSSA
form. The SCEV expressions will refer to the non-LCSSA value. If this
SCEV expression is then used with the expander, we do not preserve LCSSA
form.

This patch properly forgets the values we created PHIs for. Those need
to be recomputed again. This patch fixes PR43458.

Currently SCEV::verify does not catch this mismatch and any test would
need to run multiple passes to trigger the error (e.g. -loop-reduce
-loop-unroll). I will also look into catching this kind of mismatch in
the verifier. Also, we currently forget the whole loop in LCSSA and I'll
check if we can be more surgical.

Reviewers: efriedma, sanjoy.google, reames

Reviewed By: efriedma

Subscribers: zzheng, hiraditya, javed.absar, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68194

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[MemorySSA] LCSSA preserves MemorySSA.

Summary:
Enabling MemorySSA in the old pass manager leads to MemorySSA being run
twice due to the fact that LCSSA and LoopSimplify do not preserve
MemorySSA. T

[MemorySSA] LCSSA preserves MemorySSA.

Summary:
Enabling MemorySSA in the old pass manager leads to MemorySSA being run
twice due to the fact that LCSSA and LoopSimplify do not preserve
MemorySSA. This is the first step to address that: target LCSSA.

LCSSA does not make any changes that invalidate MemorySSA, so it
preserves it by design. It must preserve AA as well, for this to hold.

After this patch, MemorySSA is still run twice in the old pass manager.
Step two follows: target LoopSimplify.

Subscribers: mehdi_amini, jlebar, Prazek, llvm-commits, george.burgess.iv, chandlerc

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D60832

llvm-svn: 359032

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[LPM/BPI] Preserve BPI through trivial loop pass pipeline (e.g. LCSSA, LoopSimplify)

Currently, we do not expose BPI to loop passes at all. In the old pass manager, we appear to have been ignoring t

[LPM/BPI] Preserve BPI through trivial loop pass pipeline (e.g. LCSSA, LoopSimplify)

Currently, we do not expose BPI to loop passes at all. In the old pass manager, we appear to have been ignoring the fact that LCSSA and/or LoopSimplify didn't preserve BPI, and making it available to the following loop passes anyways. In the new one, it's invalidated before running any loop pass if either LCSSA or LoopSimplify actually make changes. If they don't make changes, then BPI is valid and available. So, we go ahead and teach LCSSA and LoopSimplify how to preserve BPI for consistency between old and new pass managers.

This patch avoids an invalidation between the two requires in the following trivial pass pipeline:
opt -passes="requires<branch-prob>,loop(no-op-loop),requires<branch-prob>"
(when the input file is one which requires either LCSSA or LoopSimplify to canonicalize the loops)

Differential Revision: https://reviews.llvm.org/D60790

llvm-svn: 358901

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[LCSSA] Handle case with single new PHI faster.

If there is only a single available value, all uses must be dominated by
the single value and there is no need to search for a reaching
definition.

T

[LCSSA] Handle case with single new PHI faster.

If there is only a single available value, all uses must be dominated by
the single value and there is no need to search for a reaching
definition.

This drastically speeds up LCSSA in some cases. For the test case
from PR37202, it speeds up LCSSA construction by 4 times.

Time-passes without this patch for test case from PR37202:

Total Execution Time: 29.9285 seconds (29.9276 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
5.2786 ( 17.7%) 0.0021 ( 1.2%) 5.2806 ( 17.6%) 5.2808 ( 17.6%) Unswitch loops
4.3739 ( 14.7%) 0.0303 ( 18.1%) 4.4042 ( 14.7%) 4.4042 ( 14.7%) Loop-Closed SSA Form Pass
4.2658 ( 14.3%) 0.0192 ( 11.5%) 4.2850 ( 14.3%) 4.2851 ( 14.3%) Loop-Closed SSA Form Pass #2
2.2307 ( 7.5%) 0.0013 ( 0.8%) 2.2320 ( 7.5%) 2.2318 ( 7.5%) Loop Invariant Code Motion
2.0888 ( 7.0%) 0.0012 ( 0.7%) 2.0900 ( 7.0%) 2.0897 ( 7.0%) Unroll loops
1.6761 ( 5.6%) 0.0013 ( 0.8%) 1.6774 ( 5.6%) 1.6774 ( 5.6%) Value Propagation
1.3686 ( 4.6%) 0.0029 ( 1.8%) 1.3716 ( 4.6%) 1.3714 ( 4.6%) Induction Variable Simplification
1.1457 ( 3.8%) 0.0010 ( 0.6%) 1.1468 ( 3.8%) 1.1468 ( 3.8%) Loop-Closed SSA Form Pass #4
1.1384 ( 3.8%) 0.0005 ( 0.3%) 1.1389 ( 3.8%) 1.1389 ( 3.8%) Loop-Closed SSA Form Pass #6
1.1360 ( 3.8%) 0.0027 ( 1.6%) 1.1387 ( 3.8%) 1.1387 ( 3.8%) Loop-Closed SSA Form Pass #5
1.1331 ( 3.8%) 0.0010 ( 0.6%) 1.1341 ( 3.8%) 1.1340 ( 3.8%) Loop-Closed SSA Form Pass #3

Time passes with this patch

Total Execution Time: 19.2802 seconds (19.2813 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
4.4234 ( 23.2%) 0.0038 ( 2.0%) 4.4272 ( 23.0%) 4.4273 ( 23.0%) Unswitch loops
2.3828 ( 12.5%) 0.0020 ( 1.1%) 2.3848 ( 12.4%) 2.3847 ( 12.4%) Unroll loops
1.8714 ( 9.8%) 0.0020 ( 1.1%) 1.8734 ( 9.7%) 1.8735 ( 9.7%) Loop Invariant Code Motion
1.7973 ( 9.4%) 0.0022 ( 1.2%) 1.7995 ( 9.3%) 1.8003 ( 9.3%) Value Propagation
1.4010 ( 7.3%) 0.0033 ( 1.8%) 1.4043 ( 7.3%) 1.4044 ( 7.3%) Induction Variable Simplification
0.9978 ( 5.2%) 0.0244 ( 13.1%) 1.0222 ( 5.3%) 1.0224 ( 5.3%) Loop-Closed SSA Form Pass #2
0.9611 ( 5.0%) 0.0257 ( 13.8%) 0.9868 ( 5.1%) 0.9868 ( 5.1%) Loop-Closed SSA Form Pass
0.5856 ( 3.1%) 0.0015 ( 0.8%) 0.5871 ( 3.0%) 0.5869 ( 3.0%) Unroll loops #2
0.4132 ( 2.2%) 0.0012 ( 0.7%) 0.4145 ( 2.1%) 0.4143 ( 2.1%) Loop Invariant Code Motion #3

Reviewers: efriedma, davide, mzolotukhin

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D57033

llvm-svn: 352960

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[LCSSA] Add expensive verification of LCSSA form for sub-loops.

This assertion makes sure all sub-loops are in LCSSA form before
bringing their parent in LCSSA form. This precondition was added to
f

[LCSSA] Add expensive verification of LCSSA form for sub-loops.

This assertion makes sure all sub-loops are in LCSSA form before
bringing their parent in LCSSA form. This precondition was added to
formLCSSA in D56848.

Reviewers: davide, efriedma, mzolotukhin

Reviewed By: davide

Differential Revision: https://reviews.llvm.org/D56921

llvm-svn: 352958

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Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the ne

Update the file headers across all of the LLVM projects in the monorepo
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636

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[LCSSA] Skip blocks in sub-loops when scanning for uses.

Summary:
Scanning blocks in sub-loops for uses is unnecessary, as they were
already handled while dealing with the containing sub-loop.

This

[LCSSA] Skip blocks in sub-loops when scanning for uses.

Summary:
Scanning blocks in sub-loops for uses is unnecessary, as they were
already handled while dealing with the containing sub-loop.

This speeds up LCSSA for highly nested loops. For the test case in PR37202, it
halves the time spent in LCSSA. In cases were we won't be able to skip
any blocks, the additional lookup should be negligible.

Time-passes without this patch for test case from PR37202:

Total Execution Time: 48.5505 seconds (48.5511 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
10.0822 ( 21.0%) 0.1406 ( 27.0%) 10.2228 ( 21.1%) 10.2228 ( 21.1%) Loop-Closed SSA Form Pass
10.0417 ( 20.9%) 0.1467 ( 28.2%) 10.1884 ( 21.0%) 10.1890 ( 21.0%) Loop-Closed SSA Form Pass #2
4.2703 ( 8.9%) 0.0040 ( 0.8%) 4.2742 ( 8.8%) 4.2742 ( 8.8%) Unswitch loops
2.7376 ( 5.7%) 0.0229 ( 4.4%) 2.7605 ( 5.7%) 2.7611 ( 5.7%) Loop-Closed SSA Form Pass #5
2.7332 ( 5.7%) 0.0214 ( 4.1%) 2.7546 ( 5.7%) 2.7546 ( 5.7%) Loop-Closed SSA Form Pass #3
2.7088 ( 5.6%) 0.0230 ( 4.4%) 2.7319 ( 5.6%) 2.7324 ( 5.6%) Loop-Closed SSA Form Pass #4
2.6855 ( 5.6%) 0.0236 ( 4.5%) 2.7091 ( 5.6%) 2.7090 ( 5.6%) Loop-Closed SSA Form Pass #6
2.1648 ( 4.5%) 0.0018 ( 0.4%) 2.1666 ( 4.5%) 2.1664 ( 4.5%) Unroll loops
1.8371 ( 3.8%) 0.0009 ( 0.2%) 1.8379 ( 3.8%) 1.8380 ( 3.8%) Value Propagation
1.8149 ( 3.8%) 0.0021 ( 0.4%) 1.8170 ( 3.7%) 1.8169 ( 3.7%) Loop Invariant Code Motion
1.6755 ( 3.5%) 0.0226 ( 4.3%) 1.6981 ( 3.5%) 1.6980 ( 3.5%) Loop-Closed SSA Form Pass #7

Time-passes with this patch

Total Execution Time: 29.9285 seconds (29.9276 wall clock)

---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
5.2786 ( 17.7%) 0.0021 ( 1.2%) 5.2806 ( 17.6%) 5.2808 ( 17.6%) Unswitch loops
4.3739 ( 14.7%) 0.0303 ( 18.1%) 4.4042 ( 14.7%) 4.4042 ( 14.7%) Loop-Closed SSA Form Pass
4.2658 ( 14.3%) 0.0192 ( 11.5%) 4.2850 ( 14.3%) 4.2851 ( 14.3%) Loop-Closed SSA Form Pass #2
2.2307 ( 7.5%) 0.0013 ( 0.8%) 2.2320 ( 7.5%) 2.2318 ( 7.5%) Loop Invariant Code Motion
2.0888 ( 7.0%) 0.0012 ( 0.7%) 2.0900 ( 7.0%) 2.0897 ( 7.0%) Unroll loops
1.6761 ( 5.6%) 0.0013 ( 0.8%) 1.6774 ( 5.6%) 1.6774 ( 5.6%) Value Propagation
1.3686 ( 4.6%) 0.0029 ( 1.8%) 1.3716 ( 4.6%) 1.3714 ( 4.6%) Induction Variable Simplification
1.1457 ( 3.8%) 0.0010 ( 0.6%) 1.1468 ( 3.8%) 1.1468 ( 3.8%) Loop-Closed SSA Form Pass #4
1.1384 ( 3.8%) 0.0005 ( 0.3%) 1.1389 ( 3.8%) 1.1389 ( 3.8%) Loop-Closed SSA Form Pass #6
1.1360 ( 3.8%) 0.0027 ( 1.6%) 1.1387 ( 3.8%) 1.1387 ( 3.8%) Loop-Closed SSA Form Pass #5
1.1331 ( 3.8%) 0.0010 ( 0.6%) 1.1341 ( 3.8%) 1.1340 ( 3.8%) Loop-Closed SSA Form Pass #3

Reviewers: davide, efriedma, mzolotukhin

Reviewed By: davide, efriedma

Subscribers: hiraditya, dmgreen, llvm-commits

Differential Revision: https://reviews.llvm.org/D56848

llvm-svn: 351567

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[DebugInfo][LCSSA] Rewrite pre-existing debug values outside loop

Summary:
Extend LCSSA so that debug values outside loops are rewritten to
use the PHI nodes that the pass creates.

This fixes PR390

[DebugInfo][LCSSA] Rewrite pre-existing debug values outside loop

Summary:
Extend LCSSA so that debug values outside loops are rewritten to
use the PHI nodes that the pass creates.

This fixes PR39019. In that case, we ran LCSSA on a loop that
was later on vectorized, which left us with something like this:

for.cond.cleanup:
%add.lcssa = phi i32 [ %add, %for.body ], [ %34, %middle.block ]
call void @llvm.dbg.value(metadata i32 %add,
ret i32 %add.lcssa

for.body:
%add =
[...]
br i1 %exitcond, label %for.cond.cleanup, label %for.body

which later resulted in the debug.value becoming undef when
removing the scalar loop (and the location would have probably
been wrong for the vectorized case otherwise).

As we now may need to query the AvailableVals cache more than
once for a basic block, FindAvailableVals() in SSAUpdaterImpl is
changed so that it updates the cache for blocks that we do not
create a PHI node for, regardless of the block's number of
predecessors. The debug value in the attached IR reproducer
would not be properly rewritten without this.

Debug values residing in blocks where we have not inserted any
PHI nodes are currently left as-is by this patch. I'm not sure
what should be done with those uses.

Reviewers: mattd, aprantl, vsk, probinson

Reviewed By: mattd, aprantl

Subscribers: jmorse, gbedwell, JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D53130

llvm-svn: 344589

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[DebugInfo][LCSSA] Preserve debug location in lcssa phis

Summary:
When inserting lcssa Phi Nodes in the exit block
mak sure to preserve the original instructions DL.

Reviewers: vsk

Subscribers: JD

[DebugInfo][LCSSA] Preserve debug location in lcssa phis

Summary:
When inserting lcssa Phi Nodes in the exit block
mak sure to preserve the original instructions DL.

Reviewers: vsk

Subscribers: JDevlieghere, llvm-commits

Differential Revision: https://reviews.llvm.org/D50009

llvm-svn: 338391

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