Some of the changes in the patch include:
1. Using iterators instead of instruction pointers when applicable.
2. Modifying Polly functions to accept iterators instead of inst
pointers.
3. Updating API usages such as use begin instead of front.
As part of the effort to transition to using Debug Records instead of
Debug intrinsics, some API/argument changes are necessary to achieve the
desired behavior from Debug Records. This particular fix involves
passing iterators instead of instruction pointers to the SetInsertPoint
function. While this is crucial in certain areas, it may be more than
needed in others, but it does not cause any harm.
As part of the "RemoveDIs" project, BasicBlock::iterator now carries a
debug-info bit that's needed when getFirstNonPHI and similar feed into
instruction insertion positions. Call-sites where that's necessary were
updated a year ago; but to ensure some type safety however, we'd like to
have all calls to getFirstNonPHI use the iterator-returning version.
This patch changes a bunch of call-sites calling getFirstNonPHI to use
getFirstNonPHIIt, which returns an iterator. All these call sites are
where it's obviously safe to fetch the iterator then dereference it. A
follow-up patch will contain less-obviously-safe changes.
We'll eventually deprecate and remove the instruction-pointer
getFirstNonPHI, but not before adding concise documentation of what
considerations are needed (very few).
---------
Co-authored-by: Stephen Tozer <Melamoto@gmail.com>
This patch introduces the initial implementation for annotating loops
created by Polly. Polly generates RunTimeChecks (RTCs), which result in
loop versioning. Specifically, the loop created by Polly is executed
when the RTCs pass, otherwise, the original loop is executed.
This patch adds the "llvm.loop.vectorize.enable" metadata, setting it to
true for loops created by Polly. Disabling vectorization for the original
fallback loop is already merged in #119188.
This behavior is controlled by the 'polly-annotate-metadata-vectorize'
flag, and the annotations are applied only when this flag is enabled.
This flag is set to false by default.
NOTE: This commit is initial patch in effort to make polly interact with
Loop Vectorizer via metadata.
---------
Co-authored-by: Michael Kruse <github@meinersbur.de>
These are the last remaining "trivial" changes to passes that use
Instruction pointers for insertion. All of this should be NFC, it's just
changing the spelling of how we identify a position.
In one or two locations, I'm also switching uses of getNextNode etc to
using std::next with iterators. This too should be NFC.
---------
Merged by: Stephen Tozer <stephen.tozer@sony.com>
The IR Verifier requires that every call instruction to an inlineable
function (among other things, its implementation must be visible in the
translation unit) must also have !dbg metadata attached to it. When
parallelizing, Polly emits calls to OpenMP runtime function out of thin
air, or at least not directly derived from a bounded list of previous
instruction. While we could search for instructions in the SCoP that has
some debug info attached to it, there is no guarantee that we find any.
Our solution is to generate a new DILocation that points to line 0 to
represent optimized code.
The OpenMP function implementation is usually not available in the
user's translation unit, but can become visible in an LTO build. For
the bug to appear, libomp must also be built with debug symbols.
IMHO, the IR verifier rule is too strict. Runtime functions can
also be inserted by other optimization passes, such as
LoopIdiomRecognize. When inserting a call to e.g. memset, it uses the
DebugLoc from a StoreInst from the unoptimized code. It is not
required to have !dbg metadata attached either.
Fixes#56692
The ParallelLoopGenerator class is changed such that GNU OpenMP specific
code was removed, allowing to use it as super class in a
template-pattern. Therefore, the code has been reorganized and one may
not use the ParallelLoopGenerator directly anymore, instead specific
implementations have to be provided. These implementations contain the
library-specific code. As such, the "GOMP" (code completely taken from
the existing backend) and "KMP" variant were created.
For "check-polly" all tests that involved "GOMP": equivalents were added
that test the new functionalities, like static scheduling and different
chunk sizes. "docs/UsingPollyWithClang.rst" shows how the alternative
backend may be used.
Patch by Michael Halkenhäuser <michaelhalk@web.de>
Differential Revision: https://reviews.llvm.org/D59100
llvm-svn: 356434
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
Currently, in case of GEMM and the pattern matching based optimizations, we
use only the SLP Vectorizer out of two LLVM vectorizers. Since the Loop
Vectorizer can get in the way of optimal code generation, we disable the Loop
Vectorizer for the innermost loop using mark nodes and emitting the
corresponding metadata.
Reviewed-by: Tobias Grosser <tobias@grosser.es>
Differential Revision: https://reviews.llvm.org/D36928
llvm-svn: 311473
Today Polly generates induction variable in this way:
polly.indvar = phi 0, polly.indvar.next
...
polly.indvar.next = polly.indvar + stide
polly.loop_cond = predicate polly.indvar, (UB - stride)
Instead of:
polly.indvar = phi 0, polly.indvar.next
...
polly.indvar.next = polly.indvar + stide
polly.loop_cond = predicate polly.indvar.next, UB
The way Polly generate induction variable cause some problem in the indvar simplify pass.
This patch make polly generate the later form, by assuming the induction variable never overflow
Differential Revision: https://reviews.llvm.org/D33089
llvm-svn: 302866
Summary:
A couple of the utilities used to analyze or build IR make explicit use of the legacy PM on their interface, to access analysis results. This patch removes the legacy PM from the interface, and just passes the required results directly.
This shouldn't introduce any function changes, although the API technically allowed to obtain two different analysis results before, one passed by reference and one through the PM. I don't believe that was ever intended, however.
Reviewers: grosser, Meinersbur
Reviewed By: grosser
Subscribers: nemanjai, pollydev, llvm-commits
Tags: #polly
Differential Revision: https://reviews.llvm.org/D31653
llvm-svn: 299423
In commit r219005 lifetime markers have been introduced to mark the lifetime of
the OpenMP context data structure. However, their use seems incorrect and
recently caused a miscompile in ASC_Sequoia/CrystalMk after r298053 which was
not at all related to r298053. r298053 only caused a change in the loop order,
as this change resulted in a different isl internal representation which caused
the scheduler to derive a different schedule. This change then caused the IR to
change, which apparently created a pattern in which LLVM exploites the lifetime
markers. It seems we are using the OpenMP context outside of the lifetime
markers. Even though CrystalMk could probably be fixed by expanding the scope of
the lifetime markers, it is not clear what happens in case the OpenMP function
call is in a loop which will cause a sequence of starting and ending lifetimes.
As it is unlikely that the lifetime markers give any performance benefit, we
just drop them to remove complexity.
llvm-svn: 298192
Instead of using 0 or NULL use the C++11 nullptr symbol when referencing null
pointers.
This cleanup was suggested by Eugene Zelenko <eugene.zelenko@gmail.com> in
http://reviews.llvm.org/D21488 and was split out to increase readability.
llvm-svn: 273435
The recent expression type changes still need more discussion, which will happen
on phabricator or on the mailing list. The precise list of commits reverted are:
- "Refactor division generation code"
- "[NFC] Generate runtime checks after the SCoP"
- "[FIX] Determine insertion point during SCEV expansion"
- "Look through IntToPtr & PtrToInt instructions"
- "Use minimal types for generated expressions"
- "Temporarily promote values to i64 again"
- "[NFC] Avoid unnecessary comparison for min/max expressions"
- "[Polly] Fix -Wunused-variable warnings (NFC)"
- "[NFC] Simplify min/max expression generation"
- "Simplify the type adjustment in the IslExprBuilder"
Some of them are just reverted as we would otherwise get conflicts. I will try
to re-commit them if possible.
llvm-svn: 272483
We now have a simple function to adjust/unify the types of two (or three)
operands before an operation that requieres the same type for all operands.
Due to this change we will not promote parameters that are added to i64
anymore if that is not needed.
llvm-svn: 271513
Remove all the implicit ilist iterator conversions from polly, in
preparation for making them illegal in ADT. There was one oddity I came
across: at line 95 of lib/CodeGen/LoopGenerators.cpp, there was a
post-increment `Builder.GetInsertPoint()++`.
Since it was a no-op, I removed it, but I admit I wonder if it might be
a bug (both before and after this change)? Perhaps it should be a
pre-increment?
llvm-svn: 252357
Value maps are created and used in many places and it is not always
possible to include CodeGen/Blockgenerators.h. To this end, ValueMapT
now lives in the ScopHelper.h which does not have any dependences itself.
This patch also replaces uses of different other value map types with
the ValueMapT.
llvm-svn: 249606
Certain backends, e.g. NVPTX, do not support '.' in function names. Hence,
we ensure all '.' are replaced by '_' when generating function names for
subfunctions. For the current OpenMP code generation, this is not strictly
necessary, but future uses cases (e.g. GPU offloading) need this issue to be
fixed.
llvm-svn: 246980
Upcoming revisions of isl require us to include header files explicitly, which
have previously been already transitively included. Before we add them, we sort
the existing includes.
Thanks to Chandler for sort_includes.py. A simple, but very convenient script.
llvm-svn: 236930
+ Generalized function names and comments
+ Removed OpenMP (omp) from the names and comments
+ Use common names (non OpenMP specific) for runtime library call creation
methodes
+ Commented the parallel code generator and all its member functions
+ Refactored some values and methodes
Differential Revision: http://reviews.llvm.org/D4990
llvm-svn: 219003
The LoopAnnotator doesn't annotate only loops any more, thus it is
called ScopAnnotator from now on.
This also removes unnecessary polly:: namespace tags.
llvm-svn: 218878
This change allows to annotate all parallel loops with loop id metadata.
Furthermore, it will annotate memory instructions with
llvm.mem.parallel_loop_access metadata for all surrounding parallel loops.
This is especially usefull if an external paralleliser is used.
This also removes the PollyLoopInfo class and comments the
LoopAnnotator.
A test case for multiple parallel loops is attached.
llvm-svn: 218793
This allows us to omit the GuardBB in front of created loops
if we can show the loop trip count is at least one. It also
simplifies the dominance relation inside the new created region.
A GuardBB (even with a constant branch condition) might trigger
false dominance errors during function verification.
Differential Revision: http://reviews.llvm.org/D5297
llvm-svn: 217525
Use the explicit analysis if possible, only for splitBlock we will continue
to use the Pass * argument. This change allows us to remove the getAnalysis
calls from the code generation.
llvm-svn: 215121
