Artur Pilipenko [Wed, 1 Mar 2017 18:12:29 +0000 (18:12 +0000)]
[DAGCombiner] Support {a|s}ext, {a|z|s}ext load nodes in load combine
Resubmit r295336 after the bug with non-zero offset patterns on BE targets is fixed (r296336).
Support {a|s}ext, {a|z|s}ext load nodes as a part of load combine patters.
Reviewed By: filcab
Differential Revision: https://reviews.llvm.org/D29591
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296651
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Krzysztof Parzyszek [Wed, 1 Mar 2017 17:53:42 +0000 (17:53 +0000)]
[Hexagon] Fix testcase accidentally broken by r296645
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296647
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Krzysztof Parzyszek [Wed, 1 Mar 2017 17:30:10 +0000 (17:30 +0000)]
[Hexagon] Fix lowering of formal arguments of type i1
On Hexagon, values of type i1 are passed in registers of type i32,
even though i1 is not a legal value for these registers. This is a
special case and needs special handling to maintain consistency of
the lowering information.
This fixes PR32089.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296645
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Zachary Turner [Wed, 1 Mar 2017 17:22:36 +0000 (17:22 +0000)]
[PDB] Re-add BinaryStreamTest.
This re-adds all the binary stream tests. This was reverted due
to some misaligned reads. For now the offending test is
disabled while I investigate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296643
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Hans Wennborg [Wed, 1 Mar 2017 17:15:08 +0000 (17:15 +0000)]
[GVNHoist] Don't hoist unsafe scalars at -Oz (PR31729)
Based on Aditya Kumar's patch:
Differential Revision: https://reviews.llvm.org/D29092
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296642
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Vedant Kumar [Wed, 1 Mar 2017 17:10:03 +0000 (17:10 +0000)]
Remove unittests/DebugInfo/PDB/BinaryStreamTest.cpp (from r296555)
It breaks the ToT UBSan bots:
/Users/vk/Desktop/llvm/include/llvm/DebugInfo/MSF/BinaryStreamArray.h:246:12: runtime error: reference binding to misaligned address 0x7f925540939a for type 'const int', which requires 4 byte alignment
0x7f925540939a: note: pointer points here
05 00 00 00 01 00 00 00 02 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 70 98 50 06 01 00
^
0 DebugInfoPDBTests 0x0000000106263cbd llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 45
1 DebugInfoPDBTests 0x00000001062628ff llvm::sys::RunSignalHandlers() + 159
2 DebugInfoPDBTests 0x0000000106264593 SignalHandler(int) + 179
3 libsystem_platform.dylib 0x0000000107bb3fba _sigtramp + 26
4 libsystem_pthread.dylib 0x0000000107bd82c8 _pthread_keys + 9720
5 libsystem_c.dylib 0x0000000107947f83 abort + 127
6 libclang_rt.ubsan_osx_dynamic.dylib 0x0000000106bb5fc2 __sanitizer::Abort() + 66
7 DebugInfoPDBTests 0x000000010613f880 llvm::FixedStreamArrayIterator<int>::operator+=(long) + 0
8 DebugInfoPDBTests 0x000000010613f615 llvm::FixedStreamArrayIterator<int>::operator*() const + 37
9 DebugInfoPDBTests 0x000000010613f3cb std::__1::enable_if<__is_forward_iterator<llvm::FixedStreamArrayIterator<int> >::value, void>::type std::__1::vector<int, std::__1::allocator<int> >::__construct_at_end<llvm::FixedStreamArrayIterator<int> >(llvm::FixedStreamArrayIterator<int>, llvm::FixedStreamArrayIterator<int>, unsigned long) + 251
10 DebugInfoPDBTests 0x000000010613f292 std::__1::vector<int, std::__1::allocator<int> >::vector<llvm::FixedStreamArrayIterator<int> >(llvm::FixedStreamArrayIterator<int>, std::__1::enable_if<(__is_forward_iterator<llvm::FixedStreamArrayIterator<int> >::value) && (is_constructible<int, std::__1::iterator_traits<llvm::FixedStreamArrayIterator<int> >::reference>::value), llvm::FixedStreamArrayIterator<int> >::type) + 226
11 DebugInfoPDBTests 0x000000010613ddb7 std::__1::vector<int, std::__1::allocator<int> >::vector<llvm::FixedStreamArrayIterator<int> >(llvm::FixedStreamArrayIterator<int>, std::__1::enable_if<(__is_forward_iterator<llvm::FixedStreamArrayIterator<int> >::value) && (is_constructible<int, std::__1::iterator_traits<llvm::FixedStreamArrayIterator<int> >::reference>::value), llvm::FixedStreamArrayIterator<int> >::type) + 87
12 DebugInfoPDBTests 0x000000010613d4af (anonymous namespace)::BinaryStreamTest_StreamReaderIntegerArray_Test::TestBody() + 1279
13 DebugInfoPDBTests 0x00000001062780f3 testing::Test::Run() + 179
14 DebugInfoPDBTests 0x0000000106279594 testing::TestInfo::Run() + 308
15 DebugInfoPDBTests 0x000000010627a6a3 testing::TestCase::Run() + 307
16 DebugInfoPDBTests 0x00000001062849d4 testing::internal::UnitTestImpl::RunAllTests() + 756
17 DebugInfoPDBTests 0x0000000106284558 testing::UnitTest::Run() + 152
18 DebugInfoPDBTests 0x0000000106266fa5 main + 117
19 libdyld.dylib 0x00000001078506a5 start + 1
zsh: abort ./unittests/DebugInfo/PDB/DebugInfoPDBTests
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296641
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Zachary Turner [Wed, 1 Mar 2017 17:02:41 +0000 (17:02 +0000)]
[PDB] Remove use of std error codes.
I already created a BinaryStreamError class for this purpose,
so update the code to use that on the remaining occurrences
of errc values.
This should also address the issue which led to r296583.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296640
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Diana Picus [Wed, 1 Mar 2017 15:54:21 +0000 (15:54 +0000)]
clang-format r296631
Apparently I forgot to run it after fixing up some things...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296634
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Diana Picus [Wed, 1 Mar 2017 15:35:14 +0000 (15:35 +0000)]
[ARM] GlobalISel: Lower call params that need extensions
Lower i1, i8 and i16 call parameters by extending them before storing them on
the stack. Also make sure we encode the correct, extended size in the
corresponding memory operand, and that we compute the correct stack size in the
end.
The latter is a bit more complicated because we used to compute the stack size
in the getStackAddress method, based on the Size and Offset of the parameters.
However, if the last parameter is sign extended, we'd be using the wrong,
non-extended size, and we'd end up with a smaller stack than we need to hold the
extended value. Instead of hacking this up based on the value of Size in
getStackAddress, we move our stack size handling logic to assignArg, where we
have access to the CCState which knows everything we could possibly want to know
about the stack. This way we don't need to duplicate any knowledge or resort to
any ugly hacks.
On this same occasion, update the IRTranslator test to check the sizes of the
stores everywhere, not just for sign extended paramteres.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296631
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Sanjay Patel [Wed, 1 Mar 2017 14:46:59 +0000 (14:46 +0000)]
[x86] auto-generate checks; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296629
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Sanjay Patel [Wed, 1 Mar 2017 14:41:57 +0000 (14:41 +0000)]
[x86] regenerate checks; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296628
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Igor Laevsky [Wed, 1 Mar 2017 14:38:29 +0000 (14:38 +0000)]
[DeadStoreElimination] Check function modref behavior before considering memory clobbered
Differential Revision: https://reviews.llvm.org/D29996
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296625
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Simon Dardis [Wed, 1 Mar 2017 14:31:09 +0000 (14:31 +0000)]
[mips] Drop unneeded REQUIRES line in test. NFCI
rL296111 provides the proper fix.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296622
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Sanjay Patel [Wed, 1 Mar 2017 14:26:49 +0000 (14:26 +0000)]
[PPC] add tests for select-of-constants with binop; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296621
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Igor Laevsky [Wed, 1 Mar 2017 13:19:51 +0000 (13:19 +0000)]
[BasicAA] Take attributes into account when requesting modref info for a call site
Differential Revision: https://reviews.llvm.org/D29989
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296617
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Alexey Bataev [Wed, 1 Mar 2017 12:43:39 +0000 (12:43 +0000)]
[SLP] Preserve IR flags when vectorizing horizontal reductions.
Summary:
The SLP vectorizer should propagate IR-level optimization hints/flags
(nsw, nuw, exact, fast-math) when converting scalar horizontal
reductions instructions into vectors, just like for other vectorized
instructions.
It doe not include IR propagation for extra arguments, we need to handle
original scalar operations for extra args to propagate correct flags.
Reviewers: mkuper, mzolotukhin, hfinkel
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D30418
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296614
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Alexey Bataev [Wed, 1 Mar 2017 12:22:33 +0000 (12:22 +0000)]
[SLP] Preserve IR flags for extra args.
Summary:
We should preserve IR flags for extra args. These IR flags should be
taken from original scalar operations, not from the reduction
operations.
Reviewers: mkuper, mzolotukhin, hfinkel
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D30447
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296613
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Oliver Stannard [Wed, 1 Mar 2017 11:11:06 +0000 (11:11 +0000)]
[ARM] Fix bash-ism in test
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296610
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Oliver Stannard [Wed, 1 Mar 2017 10:51:04 +0000 (10:51 +0000)]
[ARM] Fix parsing of special register masks
This parsing code was incorrectly checking for invalid characters, so an
invalid instruction like:
msr spsr_w, r0
would be emitted as:
msr spsr_cxsf, r0
Differential revision: https://reviews.llvm.org/D30462
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296607
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Alexey Bataev [Wed, 1 Mar 2017 10:50:44 +0000 (10:50 +0000)]
[SLP] Fix for PR32038: extra add of PHI node when it is not required.
Summary:
If horizontal reduction tree starts from the binary operation that is
used in PHI node, but this PHI is not used in horizontal reduction, we
may end up with extra addition of this PHI node after vectorization.
Here is an example:
```
%phi = phi i32 [ %tmp, %end], ...
...
%tmp = add i32 %tmp1, %tmp2
end:
```
after vectorization we always have something like:
```
%phi = phi i32 [ %tmp, %end], ...
...
%red = extractelement <8 x 32> %vec.red, 0
%tmp = add i32 %red, %phi
end:
```
even if `%phi` is not used in reduction tree. Patch considers these PHI
nodes as extra arguments and considers them in the final result iff they
really used in reduction.
Reviewers: mkuper, hfinkel, mzolotukhin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D30409
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296606
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Ayman Musa [Wed, 1 Mar 2017 10:20:48 +0000 (10:20 +0000)]
[X86] Fix creating vreg def after use.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296601
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Serge Pavlov [Wed, 1 Mar 2017 09:38:15 +0000 (09:38 +0000)]
Process tilde in llvm::sys::path::native
Windows does not treat `~` as a reference to home directory, so the call
to `llvm::sys::path::native` on, say, `~/somedir` produces `~\somedir`,
which has different meaning than the original path. With this change
tilde is expanded on Windows to user profile directory. Such behavior
keeps original meaning of the path and is consistent with the algorithm
of `llvm::sys::path::home_directory`.
Differential Revision: https://reviews.llvm.org/D27527
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296590
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Mikael Holmen [Wed, 1 Mar 2017 06:45:20 +0000 (06:45 +0000)]
Remove sometimes faulty rewrite of memcpy in instcombine.
Summary:
Solves PR 31990.
The bad rewrite could replace a memcpy of one word with
store i4 -1
while it should actually be
store i8 -1
Hopefully opt and llc has improved enough so the original optimization
done by the code isn't needed anymore.
One already existing testcase is affected. It originally tested that
the memcpy was replaced with
load double
but since we now remove that rewrite it will be
load i64
instead.
Patch suggestion by Eli Friedman.
Reviewers: eli.friedman, majnemer, efriedma
Reviewed By: efriedma
Subscribers: efriedma, llvm-commits
Differential Revision: https://reviews.llvm.org/D30254
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296585
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NAKAMURA Takumi [Wed, 1 Mar 2017 05:11:41 +0000 (05:11 +0000)]
(Rewroking r296581) PDB/BinaryStreamTest.cpp: Appease mingw to avoid std::errc::no_buffer_space.
Unfortunately, mingw's libstdc++ doesn't provide winsock2 errors.
That said, we should avoid raising OS-oriented error code in our code.
For now, I suggest to define custom error from std::error_category.
See also; https://reviews.llvm.org/D20592
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296583
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NAKAMURA Takumi [Wed, 1 Mar 2017 05:11:37 +0000 (05:11 +0000)]
Revert r296581, "PDB/BinaryStreamTest.cpp: Appease mingw to avoid std::errc::no_buffer_space."
Wrong commit -- I have unstaged changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296582
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NAKAMURA Takumi [Wed, 1 Mar 2017 05:06:31 +0000 (05:06 +0000)]
PDB/BinaryStreamTest.cpp: Appease mingw to avoid std::errc::no_buffer_space.
Unfortunately, mingw's libstdc++ doesn't provide winsock2 errors.
That said, we should avoid raising OS-oriented error code in our code.
For now, I suggest to define custom error from std::error_category.
See also; https://reviews.llvm.org/D20592
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296581
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Adam Nemet [Wed, 1 Mar 2017 04:31:15 +0000 (04:31 +0000)]
[LV] These remark should have been missed remarks
The practice in LV is that we emit analysis remarks and then finally report
either a missed or applied remark on the final decision whether vectorization
is taking place. On this code path, we were closing with an analysis remark.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296578
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Mohammad Shahid [Wed, 1 Mar 2017 03:51:54 +0000 (03:51 +0000)]
[SLP] Fixes the bug due to absence of in order uses of scalars which needs to be available
for VectorizeTree() API.This API uses it for proper mask computation to be used in shufflevector IR.
The fix is to compute the mask for out of order memory accesses while building the vectorizable tree
instead of actual vectorization of vectorizable tree.
Reviewers: mkuper
Differential Revision: https://reviews.llvm.org/D30159
Change-Id: Id1e287f073fa4959713ba545fa4254db5da8b40d
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296575
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Matt Arsenault [Wed, 1 Mar 2017 03:36:04 +0000 (03:36 +0000)]
AMDGPU: Re-do update for branch-relaxation test
Modify the test so that it is still testing something
closer to what it was intended to originally.
I think the original intent was to test the situation where
there was a branch on execz and then unconditional branch
required relaxing.With the change in r296539,
there was no longer and execz branch.
Change the test so that there is now an execz branch inserted.
There is no longer an unconditional branch after the execz branch,
so this might need to be tricked in some other way to keep that
there.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296574
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Daniel Berlin [Wed, 1 Mar 2017 02:50:46 +0000 (02:50 +0000)]
clang-format GenericDomTreeConstruction.h, since the current formatting makes it look like their is a bug in the loop indentation, and there is not
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296569
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Daniel Berlin [Wed, 1 Mar 2017 01:56:41 +0000 (01:56 +0000)]
Only run the overloaded-intrinsic-name.ll test once, with FileCheck.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296564
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Daniel Berlin [Wed, 1 Mar 2017 01:49:13 +0000 (01:49 +0000)]
Keep attributes, calling convention, etc, when remangling intrinsic
Summary: Fix issue reported where intrinsic calling convention is dropped after r295253.
Reviewers: sanjoy
Subscribers: materi, llvm-commits
Differential Revision: https://reviews.llvm.org/D30422
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296563
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Zachary Turner [Wed, 1 Mar 2017 01:17:31 +0000 (01:17 +0000)]
Move constexpr arrays out of class definition.
GCC Linker doesn't seem to like this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296560
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Eugene Zelenko [Wed, 1 Mar 2017 01:14:23 +0000 (01:14 +0000)]
[DebugInfo] Fix some Include What You Use warnings; other minor fixes (NFC).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296559
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Zachary Turner [Wed, 1 Mar 2017 01:07:10 +0000 (01:07 +0000)]
Fix signed / unsigned comparison warning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296557
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Zachary Turner [Wed, 1 Mar 2017 01:04:16 +0000 (01:04 +0000)]
[PDB] Add an additional test for BinaryStreamRef.
A bug was uncovered where if you have a StreamRef whose ViewOffset
is > 0, then when you call readLongestContiguousChunk it will
succeed even when it shouldn't, and it always return you a
buffer that was taken as if the ViewOffset was 0.
Fixed this bug and added a test for it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296556
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Zachary Turner [Wed, 1 Mar 2017 01:03:53 +0000 (01:03 +0000)]
[PDB] Add tests for BinaryStream.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296555
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Adam Nemet [Wed, 1 Mar 2017 00:54:40 +0000 (00:54 +0000)]
[opt-viewer] Suggest installing the faster parser (libYAML)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296553
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Ahmed Bougacha [Wed, 1 Mar 2017 00:43:42 +0000 (00:43 +0000)]
[CodeGen] Remove dead FastISel code after SDAG emitted a tailcall.
When SDAGISel (top-down) selects a tail-call, it skips the remainder
of the block.
If, before that, FastISel (bottom-up) selected some of the (no-op) next
few instructions, we can end up with dead instructions following the
terminator (selected by SDAGISel).
We need to erase them, as we know they aren't necessary (in addition to
being incorrect).
We already do this when FastISel falls back on the tail-call itself.
Also remove the FastISel-emitted code if we fallback on the
instructions between the tail-call and the return.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296552
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Ahmed Bougacha [Wed, 1 Mar 2017 00:43:39 +0000 (00:43 +0000)]
[GlobalISel] Replace all combined G_EXTRACT uses.
Iterating on the use-list we're modifying doesn't work: after the first
iteration, the use-list iterator will point to a MachineOperand
referencing the new register. This caused us to skip the other uses to
replace.
Instead, use MRI.replaceRegWith(), which accounts for this behavior.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296551
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Paul Robinson [Wed, 1 Mar 2017 00:14:42 +0000 (00:14 +0000)]
Add missing module/license header. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296550
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Adam Nemet [Tue, 28 Feb 2017 23:59:46 +0000 (23:59 +0000)]
[opt-viewer] Handle column number 0
The asm-printer now emits remarks with function location which have
unspecified (0) source column number.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296547
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Adam Nemet [Tue, 28 Feb 2017 23:54:27 +0000 (23:54 +0000)]
Revert "(HEAD, origin/master, origin/HEAD, master) [LV] These should missed remarks"
This reverts commit r296544.
This got committed by accident.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296546
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Adam Nemet [Tue, 28 Feb 2017 23:48:58 +0000 (23:48 +0000)]
[LV] These should missed remarks
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296544
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Adrian Prantl [Tue, 28 Feb 2017 23:48:42 +0000 (23:48 +0000)]
Teach the IR verifier to reject conflicting debug info for function arguments.
Conflicting debug info for function arguments causes hard-to-debug
assertions in the DWARF backend, so the Verifier should reject it.
For performance reasons this only checks function arguments from
non-inlined debug intrinsics for now.
rdar://problem/
30520286
This reapplies r295749 after fixing PR32042.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296543
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Paul Robinson [Tue, 28 Feb 2017 23:40:46 +0000 (23:40 +0000)]
[DWARFv5] llvm-mc support for new unit header.
This is for running the assembler with -g (to emit DWARF describing
the assembler source).
Differential Revision: http://reviews.llvm.org/D30475
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296541
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Dan Gohman [Tue, 28 Feb 2017 23:37:04 +0000 (23:37 +0000)]
[WebAssembly] Convert the remaining unit tests to the new wasm-object-file target.
To facilitate this, add a new hidden command-line option to disable
the explicit-locals pass. That causes llc to emit invalid code that doesn't
have all locals converted to get_local/set_local, however it simplifies
testwriting in many cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296540
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Daniel Berlin [Tue, 28 Feb 2017 23:35:24 +0000 (23:35 +0000)]
Update AMDGPU test branch-relaxation.ll for changes after post-dom fixes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296539
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Eli Friedman [Tue, 28 Feb 2017 23:32:55 +0000 (23:32 +0000)]
[ARM] Don't generate deprecated T1 STM.
This prevents generating stm r1!, {r0, r1} on Thumb1, where value
stored for r1 is UNKONWN.
Patch by Zhaoshi Zheng.
Differential Revision: https://reviews.llvm.org/D27910
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296538
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Krzysztof Parzyszek [Tue, 28 Feb 2017 23:27:33 +0000 (23:27 +0000)]
[Hexagon] Generate extract instructions more aggressively
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296537
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Kostya Serebryany [Tue, 28 Feb 2017 23:23:48 +0000 (23:23 +0000)]
[libFuzzer] remove usage of the old coverage instrumentation
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296536
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Daniel Berlin [Tue, 28 Feb 2017 22:57:50 +0000 (22:57 +0000)]
Fix PR 24415 (at least), by making our post-dominator tree behavior sane.
Summary:
Currently, our post-dom tree tries to ignore and remove the effects of
infinite loops. It fails miserably at this, because it tries to do it
ahead of time, and thus can only detect self-loops, and any other type
of infinite loop, it pretends doesn't exist at all.
This can, in a bunch of cases, lead to wrong answers and a completely
empty post-dom tree.
Wrong answer:
```
declare void foo()
define internal void @f() {
entry:
br i1 undef, label %bb35, label %bb3.i
bb3.i:
call void @foo()
br label %bb3.i
bb35.loopexit3:
br label %bb35
bb35:
ret void
}
```
We get:
```
Inorder PostDominator Tree:
[1] <<exit node>> {0,7}
[2] %bb35 {1,6}
[3] %bb35.loopexit3 {2,3}
[3] %entry {4,5}
```
This is a trivial modification of the testcase for PR 6047
Note that we pretend bb3.i doesn't exist.
We also pretend that bb35 post-dominates entry.
While it's true that it does not exit in a theoretical sense, it's not
really helpful to try to ignore the effect and pretend that bb35
post-dominates entry. Worse, we pretend the infinite loop does
nothing (it's usually considered a side-effect), and doesn't even
exist, even when it calls a function. Sadly, this makes it impossible
to use when you are trying to move code safely. All compilers also
create virtual or real single exit nodes (including us), and connect
infinite loops there (which this patch does). In fact, others have
worked around our behavior here, to the point of building their own
post-dom trees:
https://zneak.github.io/fcd/2016/02/17/structuring.html and pointing
out the region infrastructure is near-useless for them with postdom in
this state :(
Completely empty post-dom tree:
```
define void @spam() #0 {
bb:
br label %bb1
bb1: ; preds = %bb1, %bb
br label %bb1
bb2: ; No predecessors!
ret void
}
```
Printing analysis 'Post-Dominator Tree Construction' for function 'foo':
=============================--------------------------------
Inorder PostDominator Tree:
[1] <<exit node>> {0,1}
:(
(note that even if you ignore the effects of infinite loops, bb2
should be present as an exit node that post-dominates nothing).
This patch changes post-dom to properly handle infinite loops and does
root finding during calculation to prevent empty tress in such cases.
We match gcc's (and the canonical theoretical) behavior for infinite
loops (find the backedge, connect it to the exit block).
Testcases coming as soon as i finish running this on a ton of random graphs :)
Reviewers: chandlerc, davide
Subscribers: bryant, llvm-commits
Differential Revision: https://reviews.llvm.org/D29705
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296535
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Peter Collingbourne [Tue, 28 Feb 2017 22:40:30 +0000 (22:40 +0000)]
gold-plugin: Remove unused variable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296533
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Krzysztof Parzyszek [Tue, 28 Feb 2017 22:37:01 +0000 (22:37 +0000)]
[Hexagon] Fix instruction selection for sign-extending i1 to i64
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296532
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Dean Michael Berris [Tue, 28 Feb 2017 22:01:26 +0000 (22:01 +0000)]
[XRay][Docs] Update the XRay documentation
Summary:
Update the XRay docs to mention new subcomands to the llvm-xray tool,
and details on FDR mode logging. Also list down available libraries for
use part of the LLVM distribution.
Reviewers: rSerge, pelikan, echristo, timshen, sdardis, rengolin
Subscribers: mehdi_amini, llvm-commits
Differential Revision: https://reviews.llvm.org/D30395
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296528
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Kevin Enderby [Tue, 28 Feb 2017 21:47:07 +0000 (21:47 +0000)]
Actually add error handling to unpacking the dyld compact bind and
other tables. Providing a helpful error message to what the error is and
where the error occurred based on which opcode it was associated with.
There have been handful of bug fixes dealing with bad bind info in
object files, r294021 and r249845, which only put a band aid on the
problem after a bad bind table was created after unpacking from
its compact info. In these cases a bind table should have never been
created and an error should have simply been generated.
This change puts in place the plumbing to allow checking and returning
of an error when the compact info is unpacked. This follows the model
of iterators that can fail that Lang Hanes designed when fixing the problem
for bad archives r275316 (or r275361).
This change uses one of the existing test cases that now causes an
error instead of printing <<bad library ordinal>> after a bad bind table
is created. The error uses the offset into the opcode table as shown with
the macOS dyldinfo(1) tool to indicate where the error is and which
opcode and which parameter is in error.
For example the exiting test case has this lazy binding opcode table:
% dyldinfo -opcodes test/tools/llvm-objdump/Inputs/bad-ordinal.macho-x86_64
…
lazy binding opcodes:
0x0000 BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB(0x02, 0x00000010)
0x0002 BIND_OPCODE_SET_DYLIB_ORDINAL_IMM(2)
In the test case the binary only has one library so setting the library
ordinal to the value of 2 in the BIND_OPCODE_SET_DYLIB_ORDINAL_IMM
opcode at 0x0002 above is an error. This now produces this error message:
% llvm-objdump -lazy-bind bad-ordinal.macho-x86_64
…
llvm-objdump: 'bad-ordinal.macho-x86_64': truncated or malformed object (for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB bad library ordinal: 2 (max 1) for opcode at: 0x2)
This change provides the plumbing for the error handling and one example
of an error message. Other error checks and test cases will be added in follow
on commits.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296527
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Mehdi Amini [Tue, 28 Feb 2017 21:45:59 +0000 (21:45 +0000)]
Mark some libFuzzer tests as XFAIL'd on Darwin
We're bringing up a bot on Green Dragon right now:
http://green.lab.llvm.org/green/view/Experimental/job/libFuzzer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296526
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Matt Arsenault [Tue, 28 Feb 2017 21:31:45 +0000 (21:31 +0000)]
AMDGPU: Fix types for VOP_I16_I16_I16
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296523
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Matt Arsenault [Tue, 28 Feb 2017 21:09:04 +0000 (21:09 +0000)]
AMDGPU: Add definition for v_swap_b32
This is somewhat tricky because there are two
pairs of tied operands, and it isn't allowed to be
VOP3 encoded.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296519
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Matt Arsenault [Tue, 28 Feb 2017 20:27:30 +0000 (20:27 +0000)]
AMDGPU: Add definition for v_xad_u32
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296515
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Paul Robinson [Tue, 28 Feb 2017 20:24:55 +0000 (20:24 +0000)]
[DWARFv5] Emit new unit header format.
Requesting DWARF v5 will now get you the new compile-unit and
type-unit headers. llvm-dwarfdump will also recognize them.
Differential Revision: http://reviews.llvm.org/D30206
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296514
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Matt Arsenault [Tue, 28 Feb 2017 20:15:46 +0000 (20:15 +0000)]
AMDGPU: Add ds_nop to assembler
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296513
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Matt Arsenault [Tue, 28 Feb 2017 20:15:43 +0000 (20:15 +0000)]
AMDGPU: Add definitions for ds_{read|write}_b{96|128}
It's not clear to me if this is always better than
doing ds_write2_b64 This adds the constraint of
a 128-bit register input instead of a pair of
64-bit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296512
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Stanislav Mekhanoshin [Tue, 28 Feb 2017 19:20:33 +0000 (19:20 +0000)]
[AMDGPU] Add second pass of the scheduler
If during scheduling we have identified that we cannot keep optimistic
occupancy increase critical register pressure limit and try scheduling
of the whole function again. In this case blocks with smaller pressure
will have a chance for better scheduling.
Differential Revision: https://reviews.llvm.org/D30442
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296506
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Sanjay Patel [Tue, 28 Feb 2017 18:41:49 +0000 (18:41 +0000)]
[DAGCombiner] use dyn_cast values in foldSelectOfConstants(); NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296502
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Zachary Turner [Tue, 28 Feb 2017 18:35:40 +0000 (18:35 +0000)]
Fix -Wcovered-switch-default warning.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296501
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Francis Visoiu Mistrih [Tue, 28 Feb 2017 18:34:55 +0000 (18:34 +0000)]
[LCG] Fix EXPENSIVE_CHECKS typo. NFC
Differential Revision: https://reviews.llvm.org/D30434
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296500
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Dehao Chen [Tue, 28 Feb 2017 18:09:44 +0000 (18:09 +0000)]
Add function importing info from samplepgo profile to the module summary.
Summary: For SamplePGO, the profile may contain cross-module inline stacks. As we need to make sure the profile annotation happens when all the hot inline stacks are expanded, we need to pass this info to the module importer so that it can import proper functions if necessary. This patch implemented this feature by emitting cross-module targets as part of function entry metadata. In the module-summary phase, the metadata is used to build call edges that points to functions need to be imported.
Reviewers: mehdi_amini, tejohnson
Reviewed By: tejohnson
Subscribers: davidxl, llvm-commits
Differential Revision: https://reviews.llvm.org/D30053
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296498
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James Y Knight [Tue, 28 Feb 2017 18:05:41 +0000 (18:05 +0000)]
Workaround MSVC bug when using TrailingObjects from a template.
MSVC appears to be getting confused as to whether OverloadToken is
supposed to be public or not.
This was discovered by code in Swift, and has been reported to
microsoft by hughbe:
https://connect.microsoft.com/VisualStudio/feedback/details/
3116517
Differential Revision: https://reviews.llvm.org/D29880
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296497
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Sanjay Patel [Tue, 28 Feb 2017 18:02:38 +0000 (18:02 +0000)]
[x86] add alternate IR tests for select of constants; NFC
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296496
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Zachary Turner [Tue, 28 Feb 2017 17:49:34 +0000 (17:49 +0000)]
[PDB] Add BinaryStreamError.
This migrates the stream code away from MSFError to using its
own custom Error class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296494
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Brad Smith [Tue, 28 Feb 2017 17:28:35 +0000 (17:28 +0000)]
Set default CPU for OpenBSD/arm to Cortex-A8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296493
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David Bozier [Tue, 28 Feb 2017 17:25:38 +0000 (17:25 +0000)]
Fix issue with test case. Make test x86_64 specific
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296492
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Stanislav Mekhanoshin [Tue, 28 Feb 2017 17:22:39 +0000 (17:22 +0000)]
[AMDGPU] New method to estimate register pressure
This change introduces new method to estimate register pressure in
GCNScheduler. Standard RPTracker gives huge error due to the following
reasons:
1. It does not account for live-ins or live-outs if value is not used
in the region itself. That creates a huge error in a very common case
if there are a lot of live-thu registers.
2. It does not properly count subregs.
3. It assumes a register used as an input operand can be reused as an
output. This is not always possible by itself, this is not what RA
will finally do in many cases for various reasons not limited to RA's
inability to do so, and this is not so if the value is actually a
live-thu.
In addition we can now see clear separation between live-in pressure
which we cannot change with the scheduling and tentative pressure
which we can change.
Differential Revision: https://reviews.llvm.org/D30439
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296491
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Konstantin Zhuravlyov [Tue, 28 Feb 2017 17:17:52 +0000 (17:17 +0000)]
[AMDGPU] Change amd_kernel_code_t's minor version to 1
- We do emit amd_kernel_code_t v1.1
Differential Revision: https://reviews.llvm.org/D30433
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296489
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Adrian Prantl [Tue, 28 Feb 2017 16:58:13 +0000 (16:58 +0000)]
Strip debug info when inlining into a nodebug function.
The LLVM backend cannot produce any debug info for an llvm::Function
without a DISubprogram attachment. When inlining a debug-info-carrying
function into a nodebug function, there is therefore no reason to keep
any debug info intrinsic calls or debug locations on the instructions.
This fixes a problem discovered in PR32042.
rdar://problem/
30679307
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296488
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Vedant Kumar [Tue, 28 Feb 2017 16:57:28 +0000 (16:57 +0000)]
[llvm-cov] Error-out when an unsupported format is used (PR32087)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296487
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Craig Topper [Tue, 28 Feb 2017 16:52:05 +0000 (16:52 +0000)]
[DAGISel] When checking if chain node is foldable, make sure the intermediate nodes have a single use across all results not just the result that was used to reach the chain node.
This recovers a test case that was severely broken by r296476, my making sure we don't create ADD/ADC that loads and stores when there is also a flag dependency.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296486
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Stanislav Mekhanoshin [Tue, 28 Feb 2017 16:26:27 +0000 (16:26 +0000)]
[AMDGPU] Fix read-undef flags when schedule is reverted
If two subregs of the same register are defined and we need to revert
schedule changing def order, we will end up with both instructions
having def,read-undef flags because adjustLaneLiveness() will only set
this flag but will not remove it.
Fix this by removing read-undef flags before calling adjustLaneLiveness.
Differential Revision: https://reviews.llvm.org/D30428
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296484
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David Bozier [Tue, 28 Feb 2017 16:02:37 +0000 (16:02 +0000)]
[Stack Protection] Add diagnostic information for why stack protection was applied to a function
Stack Smash Protection is not completely free, so in hot code, the overhead it causes can cause performance issues. By adding diagnostic information for which functions have SSP and why, a user can quickly determine what they can do to stop SSP being applied to a specific hot function.
This change adds a remark that is reported by the stack protection code when an instruction or attribute is encountered that causes SSP to be applied.
Patch by: James Henderson
Differential Revision: https://reviews.llvm.org/D29023
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296483
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Simon Dardis [Tue, 28 Feb 2017 15:55:23 +0000 (15:55 +0000)]
[mips] Fix 64bit slt/sltu/nor with immediates
Patch By: Alexander Richardson
Reviewers: atanasyan, theraven, sdardis
Differential Revision: https://reviews.llvm.org/D30330
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296482
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Daniel Sanders [Tue, 28 Feb 2017 15:00:27 +0000 (15:00 +0000)]
Revert r296474 - [globalisel] Change LLT constructor string into an LLT subclass that knows how to generate it.
There's a circular dependency that's only revealed when LLVM_ENABLE_MODULES=1.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296478
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Nirav Dave [Tue, 28 Feb 2017 14:24:15 +0000 (14:24 +0000)]
In visitSTORE, always use FindBetterChain, rather than only when UseAA is enabled.
Recommiting after fixup of 32-bit aliasing sign offset bug in DAGCombiner.
* Simplify Consecutive Merge Store Candidate Search
Now that address aliasing is much less conservative, push through
simplified store merging search and chain alias analysis which only
checks for parallel stores through the chain subgraph. This is cleaner
as the separation of non-interfering loads/stores from the
store-merging logic.
When merging stores search up the chain through a single load, and
finds all possible stores by looking down from through a load and a
TokenFactor to all stores visited.
This improves the quality of the output SelectionDAG and the output
Codegen (save perhaps for some ARM cases where we correctly constructs
wider loads, but then promotes them to float operations which appear
but requires more expensive constant generation).
Some minor peephole optimizations to deal with improved SubDAG shapes (listed below)
Additional Minor Changes:
1. Finishes removing unused AliasLoad code
2. Unifies the chain aggregation in the merged stores across code
paths
3. Re-add the Store node to the worklist after calling
SimplifyDemandedBits.
4. Increase GatherAllAliasesMaxDepth from 6 to 18. That number is
arbitrary, but seems sufficient to not cause regressions in
tests.
5. Remove Chain dependencies of Memory operations on CopyfromReg
nodes as these are captured by data dependence
6. Forward loads-store values through tokenfactors containing
{CopyToReg,CopyFromReg} Values.
7. Peephole to convert buildvector of extract_vector_elt to
extract_subvector if possible (see
CodeGen/AArch64/store-merge.ll)
8. Store merging for the ARM target is restricted to 32-bit as
some in some contexts invalid 64-bit operations are being
generated. This can be removed once appropriate checks are
added.
This finishes the change Matt Arsenault started in r246307 and
jyknight's original patch.
Many tests required some changes as memory operations are now
reorderable, improving load-store forwarding. One test in
particular is worth noting:
CodeGen/PowerPC/ppc64-align-long-double.ll - Improved load-store
forwarding converts a load-store pair into a parallel store and
a memory-realized bitcast of the same value. However, because we
lose the sharing of the explicit and implicit store values we
must create another local store. A similar transformation
happens before SelectionDAG as well.
Reviewers: arsenm, hfinkel, tstellarAMD, jyknight, nhaehnle
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296476
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Daniel Sanders [Tue, 28 Feb 2017 14:21:31 +0000 (14:21 +0000)]
[globalisel] Change LLT constructor string into an LLT subclass that knows how to generate it.
Summary:
This will allow future patches to inspect the details of the LLT. The implementation is now split between
the Support and CodeGen libraries to allow TableGen to use this class without introducing layering concerns.
Thanks to Ahmed Bougacha for finding a reasonable way to avoid the layering issue and providing the version of this patch without that problem.
Reviewers: t.p.northover, qcolombet, rovka, aditya_nandakumar, ab, javed.absar
Subscribers: arsenm, nhaehnle, mgorny, dberris, llvm-commits, kristof.beyls
Differential Revision: https://reviews.llvm.org/D30046
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296474
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Diana Picus [Tue, 28 Feb 2017 14:17:53 +0000 (14:17 +0000)]
[ARM] GlobalISel: Lower i32 and fp call parameters on the stack
Lower i32, float and double parameters that need to live on the stack. This
boils down to creating some G_GEPs starting from the stack pointer and storing
the values there. During the process we also keep track of the stack size and
use the final value in the ADJCALLSTACKDOWN/UP instructions.
We currently assert for smaller types, since they usually require extensions.
They will be handled in a separate patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296473
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Diana Picus [Tue, 28 Feb 2017 13:05:42 +0000 (13:05 +0000)]
[ARM] GlobalISel: Select 32-bit G_CONSTANT
Put it into a register by means of a MOVi.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296471
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Diana Picus [Tue, 28 Feb 2017 12:13:58 +0000 (12:13 +0000)]
[ARM] GlobalISel: Add mapping for G_CONSTANT
Like G_FRAME_INDEX, G_CONSTANT has one register operand and one non-register
operand.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296469
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Diana Picus [Tue, 28 Feb 2017 11:33:46 +0000 (11:33 +0000)]
[ARM] GlobalISel: Legalize 32-bit constants
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296468
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Sanne Wouda [Tue, 28 Feb 2017 10:34:48 +0000 (10:34 +0000)]
[Assembler] Add test for !srcloc references in assembler diags
Summary:
clang adds !srcloc metadata to inline assembly in LLVM bitcode generated
for inline assembly in C. The value of this !srcloc is passed to the
diagnostics handler if the inline assembly generates a diagnostic.
clang is able to turn this cookie back to a location in the C source
file.
To test this functionality without a dependency, make llc print the
!srcloc metadata if it is present. The added test uses this mechanism
to test that the correct !srclocs are passed to the diag handler.
Reviewers: rengolin, rnk, echristo, grosbach, mehdi_amini
Reviewed By: mehdi_amini
Subscribers: mehdi_amini, llvm-commits
Differential Revision: https://reviews.llvm.org/D30167
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296465
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NAKAMURA Takumi [Tue, 28 Feb 2017 10:15:25 +0000 (10:15 +0000)]
Reformat a blank line.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296464
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NAKAMURA Takumi [Tue, 28 Feb 2017 10:15:18 +0000 (10:15 +0000)]
Revert r296442 (and r296443), "Allow externally dlopen-ed libraries to be registered as permanent libraries."
It broke clang/test/Analysis/checker-plugins.c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296463
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Diana Picus [Tue, 28 Feb 2017 10:14:38 +0000 (10:14 +0000)]
[ARM] GlobalISel: Select G_GEP
At this point, G_GEP is just an add, so we treat it exactly like a G_ADD.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296462
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Oliver Stannard [Tue, 28 Feb 2017 10:04:36 +0000 (10:04 +0000)]
[ARM] Diagnose PC-writing instructions in IT blocks
In Thumb2, instructions which write to the PC are UNPREDICTABLE if they are in
an IT block but not the last instruction in the block.
Previously, we only diagnosed this for LDM instructions, this patch extends the
diagnostic to cover all of the relevant instructions.
Differential Revision: https://reviews.llvm.org/D30398
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296459
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Diana Picus [Tue, 28 Feb 2017 09:35:10 +0000 (09:35 +0000)]
[ARM] GlobalISel: Add reg bank mapping for G_GEP
This should be the same as the mapping for G_ADD etc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296455
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Diana Picus [Tue, 28 Feb 2017 09:02:42 +0000 (09:02 +0000)]
[ARM] GlobalISel: Legalize G_GEP with 32-bit offsets
At the moment we're only interested in GEPs for putting call parameters on the
stack, so we'll stick to 32-bit offsets.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296452
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Artyom Skrobov [Tue, 28 Feb 2017 08:58:40 +0000 (08:58 +0000)]
Relate the CHECK: lines to the functions that they're checking [NFC]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296450
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Vadzim Dambrouski [Tue, 28 Feb 2017 08:27:43 +0000 (08:27 +0000)]
Test commit, fix typo, NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296447
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Chandler Carruth [Tue, 28 Feb 2017 08:04:20 +0000 (08:04 +0000)]
[IR] Add range accessors for the indices of a GEP instruction.
These were noticed as missing in a code review. Add them and the boring
unit test to make sure they compile and DTRT.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296444
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Vassil Vassilev [Tue, 28 Feb 2017 07:26:21 +0000 (07:26 +0000)]
Fix Win bots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296443
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Vassil Vassilev [Tue, 28 Feb 2017 07:11:59 +0000 (07:11 +0000)]
Allow externally dlopen-ed libraries to be registered as permanent libraries.
This is also useful in cases when llvm is in a shared library. First we dlopen
the llvm shared library and then we register it as a permanent library in order
to keep the JIT and other services working.
Patch reviewed by Vedant Kumar (D29955)!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296442
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