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David Majnemer [Sun, 4 Jan 2015 07:06:53 +0000 (07:06 +0000)]
ValueTracking: ComputeNumSignBits should tolerate misshapen phi nodes
PHI nodes can have zero operands in the middle of a transform. It is
expected that utilities in Analysis don't freak out when this happens.
Note that it is considered invalid to allow these misshapen phi nodes to
make it to another pass.
This fixes PR22086.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225126
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Lang Hames [Sun, 4 Jan 2015 01:20:55 +0000 (01:20 +0000)]
[APFloat][ADT] Fix sign handling logic for FMA results that truncate to zero.
This patch adds a check for underflow when truncating results back to lower
precision at the end of an FMA. The additional sign handling logic in
APFloat::fusedMultiplyAdd should only be performed when the result of the
addition step of the FMA (in full precision) is exactly zero, not when the
result underflows to zero.
Unit tests for this case and related signed zero FMA results are included.
Fixes <rdar://problem/
18925551>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225123
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Saleem Abdulrasool [Sat, 3 Jan 2015 21:35:09 +0000 (21:35 +0000)]
llvm-readobj: add support to dump COFF export tables
This enhances llvm-readobj to print out the COFF export table, similar to the
-coff-import option. This is useful for testing in lld.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225120
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Saleem Abdulrasool [Sat, 3 Jan 2015 21:35:00 +0000 (21:35 +0000)]
ARM: permit tail calls to weak externals on COFF
Weak externals are resolved statically, so we can actually generate the tail
call on PE/COFF targets without breaking the requirements. It is questionable
whether we want to propagate the current behaviour for MachO as the requirements
are part of the ARM ELF specifications, and it seems that prior to the SVN
r215890, we would have tail'ed the call. For now, be conservative and only
permit it on PE/COFF where the call will always be fully resolved.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225119
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Hal Finkel [Sat, 3 Jan 2015 17:58:24 +0000 (17:58 +0000)]
[PowerPC/BlockPlacement] Allow target to provide a per-loop alignment preference
The existing code provided for specifying a global loop alignment preference.
However, the preferred loop alignment might depend on the loop itself. For
recent POWER cores, loops between 5 and 8 instructions should have 32-byte
alignment (while the others are better with 16-byte alignment) so that the
entire loop will fit in one i-cache line.
To support this, getPrefLoopAlignment has been made virtual, and can be
provided with an optional MachineLoop* so the target can inspect the loop
before answering the query. The default behavior, as before, is to return the
value set with setPrefLoopAlignment. MachineBlockPlacement now queries the
target for each loop instead of only once per function. There should be no
functional change for other targets.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225117
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Hal Finkel [Sat, 3 Jan 2015 14:58:25 +0000 (14:58 +0000)]
[PowerPC] Use 16-byte alignment for modern cores for functions/loops
Most modern PowerPC cores prefer that functions and loops start on
16-byte-aligned boundaries (*), so instruct block placement, etc. to make this
happen. The branch selector has also been adjusted so account for the extra
nops that might now be inserted before loop headers.
(*) Some cores actually prefer other alignments for small loops, but that will
be addressed in a follow-up commit.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225115
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Craig Topper [Sat, 3 Jan 2015 08:16:34 +0000 (08:16 +0000)]
Minor cleanup to all the switches after MatchInstructionImpl in all the AsmParsers.
Make sure they all have llvm_unreachable on the default path out of the switch. Remove unnecessary "default: break". Remove a 'return' after unreachable. Fix some indentation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225114
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Craig Topper [Sat, 3 Jan 2015 08:16:29 +0000 (08:16 +0000)]
Fix some formatting in tablegen output.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225113
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Craig Topper [Sat, 3 Jan 2015 08:16:14 +0000 (08:16 +0000)]
Replace some 'unreachable' comments with llvm_unreachable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225112
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David Majnemer [Sat, 3 Jan 2015 02:33:25 +0000 (02:33 +0000)]
ValueTracking: Make computeKnownBits for Arguments a little more clear
We would sometimes leave the out-param APInts untouched while going
through computeKnownBits. While I don't know of a way to trigger a bug
involving this in practice, it goes against the overall design of
computeKnownBits.
Found via code inspection.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225109
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Hal Finkel [Sat, 3 Jan 2015 01:16:37 +0000 (01:16 +0000)]
[PowerPC] Add support for the CMPB instruction
Newer POWER cores, and the A2, support the cmpb instruction. This instruction
compares its operands, treating each of the 8 bytes in the GPRs separately,
returning a 'mask' result of 0 (for false) or -1 (for true) in each byte.
Code generation support is added, in the form of a PPCISelDAGToDAG
DAG-preprocessing routine, that recognizes patterns close to what the
instruction computes (either exactly, or related by a constant masking
operation), and generates the cmpb instruction (along with any necessary
constant masking operation). This can be expanded if use cases arise.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225106
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Kostya Serebryany [Sat, 3 Jan 2015 00:54:43 +0000 (00:54 +0000)]
[asan] simplify the tracing code, make it use the same guard variables as coverage
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225103
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Craig Topper [Sat, 3 Jan 2015 00:00:20 +0000 (00:00 +0000)]
[X86] Disassembler support for move to/from %rax with a 32-bit memory offset is REX.W and AdSize prefix are both present.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225099
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Craig Topper [Sat, 3 Jan 2015 00:00:14 +0000 (00:00 +0000)]
[X86] Use 32-bit sign extended immediate for 64-bit LOCK_ArithBinOp with sign extended immediate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225098
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Chandler Carruth [Fri, 2 Jan 2015 23:34:39 +0000 (23:34 +0000)]
[PM] Add proper documentation for the ModulePassManager and
FunctionPassManager. These never got documented, likely due to the
clutter of this header file. This fixes another problem people noticed
when they started trying to use the new pass manager.
I've also used this to document the aspirational constraints I would
like to hold passes to. I don't really have a better place to document
such things at this point, but eventually will probably create a proper
.rst file and page for the LLVM pass infrastructure that carries such
high-level concerns.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225097
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Chandler Carruth [Fri, 2 Jan 2015 23:25:16 +0000 (23:25 +0000)]
[PM] Actually include the correct file name. Sorry for the breakage.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225096
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Chandler Carruth [Fri, 2 Jan 2015 23:16:59 +0000 (23:16 +0000)]
[PM] Lift the majority of the template boilerplate used to implement the
concept-based polymorphism in the pass manager to a separate header.
I got feedback from someone reading the code and trying to use it that
this was really making it hard to dive in and start using these APIs and
that makes a lot of sense.
This only requires a moderate amount of gymnastics to separate in this
way, namely rinsing the PreservedAnalysis object through a template
argument in a few places so that it is dependent and we only examine it
on instantiation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225094
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Chandler Carruth [Fri, 2 Jan 2015 22:51:44 +0000 (22:51 +0000)]
[PM] Fix some formatting where clang-format has improved recently.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225092
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Philip Reames [Fri, 2 Jan 2015 19:46:49 +0000 (19:46 +0000)]
Reformat statepoint documentation and fix a couple of typos
Patch by Ramkumar Ramachandra <artagnon@gmail.com>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225084
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Andrea Di Biagio [Fri, 2 Jan 2015 10:47:46 +0000 (10:47 +0000)]
Improved comments. No functional change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225080
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Craig Topper [Fri, 2 Jan 2015 07:36:23 +0000 (07:36 +0000)]
[X86] Bring some better consistency to the naming of the move to/from %al/ax/eax/rax with memory offset.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225078
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David Majnemer [Fri, 2 Jan 2015 07:29:47 +0000 (07:29 +0000)]
InstCombine: Detect when llvm.umul.with.overflow always overflows
We know overflow always occurs if both ~LHSKnownZero * ~RHSKnownZero
and LHSKnownOne * RHSKnownOne overflow.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225077
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David Majnemer [Fri, 2 Jan 2015 07:29:43 +0000 (07:29 +0000)]
Analysis: Reformulate WillNotOverflowUnsignedMul for reusability
WillNotOverflowUnsignedMul's smarts will live in ValueTracking as
computeOverflowForUnsignedMul. It now returns a tri-state result:
never overflows, always overflows and sometimes overflows.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225076
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Craig Topper [Fri, 2 Jan 2015 07:02:25 +0000 (07:02 +0000)]
[X86] Make the instructions that use AdSize16/32/64 co-exist together without using mode predicates.
This is necessary to allow the disassembler to be able to handle AdSize32 instructions in 64-bit mode when address size prefix is used.
Eventually we should probably also support 'addr32' and 'addr16' in the assembler to override the address size on some of these instructions. But for now we'll just use special operand types that will lookup the current mode size to select the right instruction.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225075
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Chandler Carruth [Fri, 2 Jan 2015 03:55:54 +0000 (03:55 +0000)]
[SROA] Teach SROA to be more aggressive in splitting now that we have
a pre-splitting pass over loads and stores.
Historically, splitting could cause enough problems that I hamstrung the
entire process with a requirement that splittable integer loads and
stores must cover the entire alloca. All smaller loads and stores were
unsplittable to prevent chaos from ensuing. With the new pre-splitting
logic that does load/store pair splitting I introduced in r225061, we
can now very nicely handle arbitrarily splittable loads and stores. In
order to fully benefit from these smarts, we need to mark all of the
integer loads and stores as splittable.
However, we don't actually want to rewrite partitions with all integer
loads and stores marked as splittable. This will fail to extract scalar
integers from aggregates, which is kind of the point of SROA. =] In
order to resolve this, what we really want to do is only do
pre-splitting on the alloca slices with integer loads and stores fully
splittable. This allows us to uncover all non-integer uses of the alloca
that would benefit from a split in an integer load or store (and where
introducing the split is safe because it is just memory transfer from
a load to a store). Once done, we make all the non-whole-alloca integer
loads and stores unsplittable just as they have historically been,
repartition and rewrite.
The result is that when there are integer loads and stores anywhere
within an alloca (such as from a memcpy of a sub-object of a larger
object), we can split them up if there are non-integer components to the
aggregate hiding beneath. I've added the challenging test cases to
demonstrate how this is able to promote to scalars even a case where we
have even *partially* overlapping loads and stores.
This restores the single-store behavior for small arrays of i8s which is
really nice. I've restored both the little endian testing and big endian
testing for these exactly as they were prior to r225061. It also forced
me to be more aggressive in an alignment test to actually defeat SROA.
=] Without the added volatiles there, we actually split up the weird i16
loads and produce nice double allocas with better alignment.
This also uncovered a number of bugs where we failed to handle
splittable load and store slices which didn't have a begininng offset of
zero. Those fixes are included, and without them the existing test cases
explode in glorious fireworks. =]
I've kept support for leaving whole-alloca integer loads and stores as
splittable even for the purpose of rewriting, but I think that's likely
no longer needed. With the new pre-splitting, we might be able to remove
all the splitting support for loads and stores from the rewriter. Not
doing that in this patch to try to isolate any performance regressions
that causes in an easy to find and revert chunk.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225074
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Chandler Carruth [Fri, 2 Jan 2015 02:47:38 +0000 (02:47 +0000)]
[SROA] Make the computation of adjusted pointers not leak GEP
instructions.
I noticed this when working on dialing up how aggressively we can
pre-split loads and stores. My test case wasn't passing because dead
GEPs into the allocas persisted when they were built by this routine.
This isn't terribly harmful, we still rewrote and promoted the alloca
and I can't conceive of how to cause this to happen in a case where we
will keep the exact same alloca but rewrite and promote the uses of it.
If that ever happened, we'd get an assert out of mem2reg.
So I don't have a direct test case yet, but the subsequent commit's test
case wouldn't pass without this. There are other problems fixed by this
patch that I spotted purely by inspection such as the fact that
getAdjustedPtr could have actually deleted dead base pointers. I don't
know how to get a base pointer to go into getAdjustedPtr today, so
I think this bug could never have manifested (and I certainly can't
write a test case for it) but, it wasn't the intent of the code. The
code really just wanted to GC the new instructions built. That can be
done more directly by comparing with the base pointer which is the only
non-new instruction that this code can return.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225073
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Chandler Carruth [Fri, 2 Jan 2015 00:34:29 +0000 (00:34 +0000)]
[SROA] Add a test case for r225068 / PR22080.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225070
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Chandler Carruth [Fri, 2 Jan 2015 00:10:22 +0000 (00:10 +0000)]
[SROA] Fix the loop exit placement to be prior to indexing the splits
array. This prevents it from walking out of bounds on the splits array.
Bug found with the existing tests by ASan and by the MSVC debug build.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225069
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Chandler Carruth [Thu, 1 Jan 2015 23:26:16 +0000 (23:26 +0000)]
[SROA] Fix two total think-os in r225061 that should have been caught on
a +asserts bootstrap, but my bootstrap had asserts off. Oops.
Anyways, in some places it is reasonable to cast (as a sanity check) the
pointer operand to a load or store to an instruction within SROA --
namely when the pointer operand is expected to be derived from an
alloca, and thus always an instruction. However, the pre-splitting code
also deals with loads and stores to non-alloca pointers and there we
need to just use the Value*. Nothing about the code relied on the
instruction cast, it was only there essentially as an invariant
assertion. Remove the two that don't actually hold.
This should fix the proximate issue in PR22080, but I'm also doing an
asserts bootstrap myself to see if there are other issues lurking.
I'll craft a reduced test case in a moment, but I wanted to get the tree
healthy as quickly as possible.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225068
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Hal Finkel [Thu, 1 Jan 2015 19:33:59 +0000 (19:33 +0000)]
[PowerPC] use UINT64_C instead of ul
Attempting to fix PR22078 (building on 32-bit systems) by replacing my careless
use of 1ul to be a uint64_t constant with UINT64_C(1).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225066
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Michael Gottesman [Thu, 1 Jan 2015 13:54:05 +0000 (13:54 +0000)]
Revert "Just use a using directive in SmallMapVector instead of inheriting from MapVector itself."
This reverts commit r225059. I think MSVC 2012 has a problem with this. This is
an attempt to fix one of the MSVC 2012 bots.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225065
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Chandler Carruth [Thu, 1 Jan 2015 13:01:25 +0000 (13:01 +0000)]
Revert r225053: Add an ArrayRef upcasting constructor from ArrayRef<U*> -> ArrayRef<T*> where T is a base of U.
This appears to have broken at least the windows build bots due to
compile errors in the predicate that didn't simply supress the overload.
I'm not sure what the fix is, and the bots have been broken for a long
time now so I'm just reverting until Michael can figure out a fix.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225064
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Chandler Carruth [Thu, 1 Jan 2015 12:56:47 +0000 (12:56 +0000)]
[SROA] Switch to using a more direct debug logging technique in one part
of my new load and store splitting, and fix a bug where it logged
a totally irrelevant slice rather than the actual slice in question.
The logging here previously worked because we used to place new slices
onto the back of the core sequence, but that caused other problems.
I updated the actual code to store new slices in their own vector but
didn't update the logging. There isn't a good way to reuse the logging
any more, and frankly it wasn't needed. We can directly log this bit
more easily.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225063
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Chandler Carruth [Thu, 1 Jan 2015 12:01:03 +0000 (12:01 +0000)]
[SROA] Fix formatting with clang-format which I managed to fail to do
prior to committing r225061. Sorry for that.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225062
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Chandler Carruth [Thu, 1 Jan 2015 11:54:38 +0000 (11:54 +0000)]
[SROA] Teach SROA how to much more intelligently handle split loads and
stores.
When there are accesses to an entire alloca with an integer
load or store as well as accesses to small pieces of the alloca, SROA
splits up the large integer accesses. In order to do that, it uses bit
math to merge the small accesses into large integers. While this is
effective, it produces insane IR that can cause significant problems in
the rest of the optimizer:
- It can cause load and store mismatches with GVN on the non-alloca side
where we end up loading an i64 (or some such) rather than loading
specific elements that are stored.
- We can't always get rid of the integer bit math, which is why we can't
always fix the loads and stores to work well with GVN.
- This is especially bad when we have operations that mix poorly with
integer bit math such as floating point operations.
- It will block things like the vectorizer which might be able to handle
the scalar stores that underly the aggregate.
At the same time, we can't just directly split up these loads and stores
in all cases. If there is actual integer arithmetic involved on the
values, then using integer bit math is actually the perfect lowering
because we can often combine it heavily with the surrounding math.
The solution this patch provides is to find places where SROA is
partitioning aggregates into small elements, and look for splittable
loads and stores that it can split all the way to some other adjacent
load and store. These are uniformly the cases where failing to split the
loads and stores hurts the optimizer that I have seen, and I've looked
extensively at the code produced both from more and less aggressive
approaches to this problem.
However, it is quite tricky to actually do this in SROA. We may have
loads and stores to the same alloca, or other complex patterns that are
hard to handle. This complexity leads to the somewhat subtle algorithm
implemented here. We have to do this entire process as a separate pass
over the partitioning of the alloca, and split up all of the loads prior
to splitting the stores so that we can handle safely the cases of
overlapping, including partially overlapping, loads and stores to the
same alloca. We also have to reconstitute the post-split slice
configuration so we can avoid iterating again over all the alloca uses
(the slow part of SROA). But we also have to ensure that when we split
up loads and stores to *other* allocas, we *do* re-iterate over them in
SROA to adapt to the more refined partitioning now required.
With this, I actually think we can fix a long-standing TODO in SROA
where I avoided splitting as many loads and stores as probably should be
splittable. This limitation historically mitigated the fallout of all
the bad things mentioned above. Now that we have more intelligent
handling, I plan to remove the FIXME and more aggressively mark integer
loads and stores as splittable. I'll do that in a follow-up patch to
help with bisecting any fallout.
The net result of this change should be more fine-grained and accurate
scalars being formed out of aggregates. At the very least, Clang now
generates perfect code for this high-level test case using
std::complex<float>:
#include <complex>
void g1(std::complex<float> &x, float a, float b) {
x += std::complex<float>(a, b);
}
void g2(std::complex<float> &x, float a, float b) {
x -= std::complex<float>(a, b);
}
void foo(const std::complex<float> &x, float a, float b,
std::complex<float> &x1, std::complex<float> &x2) {
std::complex<float> l1 = x;
g1(l1, a, b);
std::complex<float> l2 = x;
g2(l2, a, b);
x1 = l1;
x2 = l2;
}
This code isn't just hypothetical either. It was reduced out of the hot
inner loops of essentially every part of the Eigen math library when
using std::complex<float>. Those loops would consistently and
pervasively hop between the floating point unit and the integer unit due
to bit math extraction and insertion of floating point values that were
"stored" in a 64-bit integer register around the loop backedge.
So far, this change has passed a bootstrap and I have done some other
testing and so far, no issues. That doesn't mean there won't be though,
so I'll be prepared to help with any fallout. If you performance swings
in particular, please let me know. I'm very curious what all the impact
of this change will be. Stay tuned for the follow-up to also split more
integer loads and stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225061
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Michael Gottesman [Thu, 1 Jan 2015 08:05:41 +0000 (08:05 +0000)]
Just use a using directive in SmallMapVector instead of inheriting from MapVector itself.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225059
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Hal Finkel [Thu, 1 Jan 2015 02:53:29 +0000 (02:53 +0000)]
[PowerPC] Improve instruction selection bit-permuting operations (64-bit)
This is the second installment of improvements to instruction selection for "bit
permutation" instruction sequences. r224318 added logic for instruction
selection for 32-bit bit permutation sequences, and this adds lowering for
64-bit sequences. The 64-bit sequences are more complicated than the 32-bit
ones because:
a) the 64-bit versions of the 32-bit rotate-and-mask instructions
work by replicating the lower 32-bits of the value-to-be-rotated into the
upper 32 bits -- and integrating this into the cost modeling for the various
bit group operations is non-trivial
b) unlike the 32-bit instructions in 32-bit mode, the rotate-and-mask instructions
cannot, in one instruction, specify the
mask starting index, the mask ending index, and the rotation factor. Also,
forming arbitrary 64-bit constants is more complicated than in 32-bit mode
because the number of instructions necessary is value dependent.
Plus, support for 'late masking' was added: it is sometimes more efficient to
treat the overall value as if it had no mandatory zero bits when planning the
bit-group insertions, and then mask them in at the very end. Unfortunately, as
the structure of the bit groups is different in the two cases, the more
feasible implementation technique was to generate both instruction sequences,
and then pick the shorter one.
And finally, we now generate reasonable code for i64 bswap:
rldicl 5, 3, 16, 0
rldicl 4, 3, 8, 0
rldicl 6, 3, 24, 0
rldimi 4, 5, 8, 48
rldicl 5, 3, 32, 0
rldimi 4, 6, 16, 40
rldicl 6, 3, 48, 0
rldimi 4, 5, 24, 32
rldicl 5, 3, 56, 0
rldimi 4, 6, 40, 16
rldimi 4, 5, 48, 8
rldimi 4, 3, 56, 0
vs. what we used to produce:
li 4, 255
rldicl 5, 3, 24, 40
rldicl 6, 3, 40, 24
rldicl 7, 3, 56, 8
sldi 8, 3, 8
sldi 10, 3, 24
sldi 12, 3, 40
rldicl 0, 3, 8, 56
sldi 9, 4, 32
sldi 11, 4, 40
sldi 4, 4, 48
andi. 5, 5, 65280
andis. 6, 6, 255
andis. 7, 7, 65280
sldi 3, 3, 56
and 8, 8, 9
and 4, 12, 4
and 9, 10, 11
or 6, 7, 6
or 5, 5, 0
or 3, 3, 4
or 7, 9, 8
or 4, 6, 5
or 3, 3, 7
or 3, 3, 4
which is 12 instructions, instead of 25, and seems optimal (at least in terms
of code size).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225056
91177308-0d34-0410-b5e6-
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Michael Gottesman [Wed, 31 Dec 2014 23:33:24 +0000 (23:33 +0000)]
Add 2x constructors for TinyPtrVector, one that takes in one elemenet and the other that takes in an ArrayRef<EltTy>
Currently one can only construct an empty TinyPtrVector. These are just missing
elements of the API.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225055
91177308-0d34-0410-b5e6-
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Michael Gottesman [Wed, 31 Dec 2014 23:33:21 +0000 (23:33 +0000)]
Add a SmallMapVector class that is a MapVector with a Map of SmallDenseMap and a Vector of SmallVector.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225054
91177308-0d34-0410-b5e6-
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Michael Gottesman [Wed, 31 Dec 2014 23:33:18 +0000 (23:33 +0000)]
Add an ArrayRef upcasting constructor from ArrayRef<U*> -> ArrayRef<T*> where T is a base of U.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225053
91177308-0d34-0410-b5e6-
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Sanjay Patel [Wed, 31 Dec 2014 22:14:05 +0000 (22:14 +0000)]
InstCombine: fsub nsz 0, X ==> fsub nsz -0.0, X
Some day the backend may handle instruction-level fast math flags and make
this transform unnecessary, but it's still better practice to use the canonical
representation of fneg when possible (use a -0.0).
This is a partial fix for PR20870 ( http://llvm.org/bugs/show_bug.cgi?id=20870 ).
See also http://reviews.llvm.org/D6723.
Differential Revision: http://reviews.llvm.org/D6731
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225050
91177308-0d34-0410-b5e6-
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Rafael Espindola [Wed, 31 Dec 2014 17:19:34 +0000 (17:19 +0000)]
Add r224985 back with a fix.
The issues was that AArch64 has additional restrictions on when local
relocations can be used. We have to take those into consideration when
deciding to put a L symbol in the symbol table or not.
Original message:
Remove doesSectionRequireSymbols.
In an assembly expression like
bar:
.long L0 + 1
the intended semantics is that bar will contain a pointer one byte past L0.
In sections that are merged by content (strings, 4 byte constants, etc), a
single position in the section doesn't give the linker enough information.
For example, it would not be able to tell a relocation must point to the
end of a string, since that would look just like the start of the next.
The solution used in ELF to use relocation with symbols if there is a non-zero
addend.
In MachO before this patch we would just keep all symbols in some sections.
This would miss some cases (only cstrings on x86_64 were implemented) and was
inefficient since most relocations have an addend of 0 and can be represented
without the symbol.
This patch implements the non-zero addend logic for MachO too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225048
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Wed, 31 Dec 2014 17:14:35 +0000 (17:14 +0000)]
Reverting 225045 and 225043 and XFAIL multiline.ll on hexagon
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225047
91177308-0d34-0410-b5e6-
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Rafael Espindola [Wed, 31 Dec 2014 16:58:05 +0000 (16:58 +0000)]
Add a test for the recent compiler-rt build failure.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225046
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Wed, 31 Dec 2014 16:20:00 +0000 (16:20 +0000)]
[Hexagon] Removing assertion to appease buildbot until I can reproduce the problem
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225045
91177308-0d34-0410-b5e6-
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Rafael Espindola [Wed, 31 Dec 2014 16:06:48 +0000 (16:06 +0000)]
Revert "Remove doesSectionRequireSymbols."
This reverts commit r224985.
I am investigating why it made an Apple bot unhappy.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225044
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Colin LeMahieu [Wed, 31 Dec 2014 15:57:38 +0000 (15:57 +0000)]
[Hexagon] Changing an llvm_unreachable to an assertion and returning 0. Relocations aren't implemented yet but we don't need to abort for this in release builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225043
91177308-0d34-0410-b5e6-
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Craig Topper [Wed, 31 Dec 2014 07:24:23 +0000 (07:24 +0000)]
[X86] Update disassembler tests for absolute move instructions to check the encodings. This provides testing for r225036. 64-bit mode is still broken.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225037
91177308-0d34-0410-b5e6-
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Craig Topper [Wed, 31 Dec 2014 07:07:31 +0000 (07:07 +0000)]
[X86] Fix disassembly of absolute moves to work correctly in 16 and 32-bit modes with all 4 combinations of OpSize and AdSize prefixes being present or not.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225036
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Craig Topper [Wed, 31 Dec 2014 07:07:11 +0000 (07:07 +0000)]
[x86] Simplify detection of jcxz/jecxz/jrcxz in disassembler.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225035
91177308-0d34-0410-b5e6-
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David Majnemer [Wed, 31 Dec 2014 04:21:41 +0000 (04:21 +0000)]
InstCombine: try to transform A-B < 0 into A < B
We are allowed to move the 'B' to the right hand side if we an prove
there is no signed overflow and if the comparison itself is signed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225034
91177308-0d34-0410-b5e6-
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Alexey Samsonov [Wed, 31 Dec 2014 00:40:28 +0000 (00:40 +0000)]
Revert "merge consecutive stores of extracted vector elements"
This reverts commit r224611. This change causes crashes
in X86 DAG->DAG Instruction Selection.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225031
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Wed, 31 Dec 2014 00:08:34 +0000 (00:08 +0000)]
[Hexagon] Adding accumulating add/sub, doubleword logic-not variants, doubleword bitfield extract, word parity, accumulating multiplies with saturation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225024
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David Blaikie [Tue, 30 Dec 2014 23:33:55 +0000 (23:33 +0000)]
Fix a test case to not depend on asm comment syntax, so as to be portable
Too many different comment characters - instead of trying to account for
them all, instead disable the comments and just check for end-of-line
instead.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225020
91177308-0d34-0410-b5e6-
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David Blaikie [Tue, 30 Dec 2014 23:23:58 +0000 (23:23 +0000)]
Generalize even further, for ARM comment syntax (@)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225019
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 23:22:39 +0000 (23:22 +0000)]
[Hexagon] Adding double-logic on predicate instructions.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225018
91177308-0d34-0410-b5e6-
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David Blaikie [Tue, 30 Dec 2014 23:21:57 +0000 (23:21 +0000)]
Generalize test case to handle different asm syntax (# or // comments)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225017
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 23:04:21 +0000 (23:04 +0000)]
[Hexagon] Adding newvalue compare and jumps.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225015
91177308-0d34-0410-b5e6-
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Peter Collingbourne [Tue, 30 Dec 2014 22:52:33 +0000 (22:52 +0000)]
RTDyldMemoryManager.cpp: Make the reference to __morestack weak.
This fixes the DSO build for now. Eventually we should develop some
other mechanism to make this work correctly with DSOs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225014
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David Blaikie [Tue, 30 Dec 2014 22:47:13 +0000 (22:47 +0000)]
DebugInfo: Omit is_stmt from line table entries on the same line.
GCC does this for non-zero discriminators and since GCC doesn't produce
column info, that was the only place it comes up there. For LLVM, since
we can emit discriminators and/or column info, it makes more sense to
invert the condition and just test for changes in line number.
This should resolve at least some of the GDB 7.5 test suite failures
created by recent Clang changes that increase the location fidelity
(which, since Clang defaults to including column info on Linux by
default created a bunch of cases that confused GDB).
In theory we could do this better/differently by grouping actual source
statements together in a similar manner to the way lexical scopes are
handled but given that GDB isn't really in a position to consume that (&
users are probably somewhat used to different lines being different
'statements') this seems the safest and cheapest change. (I'm concerned
that doing this 'right' would bloat the debugloc data even further -
something Duncan's working hard to address)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225011
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Colin LeMahieu [Tue, 30 Dec 2014 22:34:08 +0000 (22:34 +0000)]
[Hexagon] Adding postincrement register newvalue stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225010
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 22:28:31 +0000 (22:28 +0000)]
[Hexagon] Removing old newvalue store variants. Adding postincrement immediate newvalue stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225009
91177308-0d34-0410-b5e6-
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Zoran Jovanovic [Tue, 30 Dec 2014 22:04:16 +0000 (22:04 +0000)]
[mips][microMIPS] Relocate with symbol for micromips symbols
Differential Revision: http://reviews.llvm.org/D6796
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225008
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Colin LeMahieu [Tue, 30 Dec 2014 22:00:26 +0000 (22:00 +0000)]
[Hexagon] Adding indexed store new-value variants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225007
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 21:01:38 +0000 (21:01 +0000)]
[Hexagon] Adding indexed store of immediates.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225006
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 20:42:23 +0000 (20:42 +0000)]
[Hexagon] Adding indexed stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225005
91177308-0d34-0410-b5e6-
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Peter Collingbourne [Tue, 30 Dec 2014 20:05:19 +0000 (20:05 +0000)]
x86_64: Fix calls to __morestack under the large code model.
Under the large code model, we cannot assume that __morestack lives within
2^31 bytes of the call site, so we cannot use pc-relative addressing. We
cannot perform the call via a temporary register, as the rax register may
be used to store the static chain, and all other suitable registers may be
either callee-save or used for parameter passing. We cannot use the stack
at this point either because __morestack manipulates the stack directly.
To avoid these issues, perform an indirect call via a read-only memory
location containing the address.
This solution is not perfect, as it assumes that the .rodata section
is laid out within 2^31 bytes of each function body, but this seems to
be sufficient for JIT.
Differential Revision: http://reviews.llvm.org/D6787
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225003
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Kostya Serebryany [Tue, 30 Dec 2014 19:29:28 +0000 (19:29 +0000)]
[asan] change _sanitizer_cov_module_init to accept int* instead of int**
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224999
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Michael Kuperstein [Tue, 30 Dec 2014 19:23:48 +0000 (19:23 +0000)]
[COFF] Don't try to add quotes to already quoted linker directives
If a linker directive is already quoted, don't try to quote it again, otherwise it creates a mess.
This pops up in places like:
#pragma comment(linker,"\"/foo bar'\"")
Differential Revision: http://reviews.llvm.org/D6792
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224998
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Colin LeMahieu [Tue, 30 Dec 2014 18:58:47 +0000 (18:58 +0000)]
[Hexagon] Adding reg-reg indexed load forms.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224997
91177308-0d34-0410-b5e6-
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Peter Collingbourne [Tue, 30 Dec 2014 18:22:06 +0000 (18:22 +0000)]
The __morestack function is only available on i386 and x86_64 architectures.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224994
91177308-0d34-0410-b5e6-
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Peter Collingbourne [Tue, 30 Dec 2014 18:06:52 +0000 (18:06 +0000)]
Make the __morestack function available to the JIT memory manager under Linux.
This function's implementation lives in libgcc, a static library, so we need
to expose it explicitly, like the other such functions.
Differential Revision: http://reviews.llvm.org/D6788
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224993
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 17:53:54 +0000 (17:53 +0000)]
[Hexagon] Dropping old combine instructions without encodings.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224992
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 17:39:24 +0000 (17:39 +0000)]
[Hexagon] Adding compare byte/halfword reg-reg/reg-imm forms. Adding compare to general register reg-imm form.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224991
91177308-0d34-0410-b5e6-
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Colin LeMahieu [Tue, 30 Dec 2014 15:44:17 +0000 (15:44 +0000)]
[Hexagon] Updating constant extender def, adding alu-not instructions, compare to general register, and inverted compares.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224989
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Elena Demikhovsky [Tue, 30 Dec 2014 14:28:14 +0000 (14:28 +0000)]
Some code improvements in Masked Load/Store.
No functional changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224986
91177308-0d34-0410-b5e6-
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Rafael Espindola [Tue, 30 Dec 2014 13:13:27 +0000 (13:13 +0000)]
Remove doesSectionRequireSymbols.
In an assembly expression like
bar:
.long L0 + 1
the intended semantics is that bar will contain a pointer one byte past L0.
In sections that are merged by content (strings, 4 byte constants, etc), a
single position in the section doesn't give the linker enough information.
For example, it would not be able to tell a relocation must point to the
end of a string, since that would look just like the start of the next.
The solution used in ELF to use relocation with symbols if there is a non-zero
addend.
In MachO before this patch we would just keep all symbols in some sections.
This would miss some cases (only cstrings on x86_64 were implemented) and was
inefficient since most relocations have an addend of 0 and can be represented
without the symbol.
This patch implements the non-zero addend logic for MachO too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224985
91177308-0d34-0410-b5e6-
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Elena Demikhovsky [Tue, 30 Dec 2014 10:17:21 +0000 (10:17 +0000)]
reverted prev commit (it was a mistake)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224984
91177308-0d34-0410-b5e6-
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Elena Demikhovsky [Tue, 30 Dec 2014 10:13:38 +0000 (10:13 +0000)]
v
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224983
91177308-0d34-0410-b5e6-
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Philip Reames [Tue, 30 Dec 2014 05:55:58 +0000 (05:55 +0000)]
Add IRBuilder routines for gc.statepoints, gc.results, and gc.relocates
Nothing particularly interesting, just adding infrastructure for use by in tree users and out of tree users.
Note: These were extracted out of a working frontend, but they have not been well tested in isolation.
Differential Revision: http://reviews.llvm.org/D6807
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224981
91177308-0d34-0410-b5e6-
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Rafael Espindola [Tue, 30 Dec 2014 05:09:17 +0000 (05:09 +0000)]
Simplify test a bit.
It looks like the original intent was to check which symbols were created.
With macho-dump the sections were being checked just to match which symbol
was in which section.
llvm-objdump prints the section a symbol is in.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224980
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Peter Zotov [Tue, 30 Dec 2014 03:24:14 +0000 (03:24 +0000)]
[OCaml] Fix bitrot in tests.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224979
91177308-0d34-0410-b5e6-
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Peter Zotov [Tue, 30 Dec 2014 03:24:11 +0000 (03:24 +0000)]
[lit] Make config.llvm_lib_dir available on cmake, too.
The OCaml tests require config.llvm_lib_dir to determine
the OCaml package search path.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224978
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Peter Zotov [Tue, 30 Dec 2014 03:24:07 +0000 (03:24 +0000)]
[OCaml] [cmake] Use LLVM_LIBRARY_DIR instead of LLVM_LIBRARY_OUTPUT_INTDIR.
The latter variable is internal.
Original patch by Ramkumar Ramachandra <artagnon@gmail.com>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224977
91177308-0d34-0410-b5e6-
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Craig Topper [Tue, 30 Dec 2014 02:35:56 +0000 (02:35 +0000)]
Testcases for r224939.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224976
91177308-0d34-0410-b5e6-
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Rafael Espindola [Tue, 30 Dec 2014 01:34:06 +0000 (01:34 +0000)]
Convert test to llvm-readobj. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224973
91177308-0d34-0410-b5e6-
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Philip Reames [Mon, 29 Dec 2014 23:55:33 +0000 (23:55 +0000)]
Semantic tests for memory invalidation at statepoints
These are simply a collection of tests intended to show that information about the contents of gc references in the heap is lost at a statepoint. I've tried to write them so that they don't disallow correct transformations, while still being fairly easy to understand.
p.s. Ideas for additional tests are welcome.
Differential Revision: http://reviews.llvm.org/D6491
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224971
91177308-0d34-0410-b5e6-
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Philip Reames [Mon, 29 Dec 2014 23:27:30 +0000 (23:27 +0000)]
Carry facts about nullness and undef across GC relocation
This change implements four basic optimizations:
If a relocated value isn't used, it doesn't need to be relocated.
If the value being relocated is null, relocation doesn't change that. (Technically, this might be collector specific. I don't know of one which it doesn't work for though.)
If the value being relocated is undef, the relocation is meaningless.
If the value being relocated was known nonnull, the relocated pointer also isn't null. (Since it points to the same source language object.)
I outlined other planned work in comments.
Differential Revision: http://reviews.llvm.org/D6600
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224968
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Philip Reames [Mon, 29 Dec 2014 23:00:57 +0000 (23:00 +0000)]
Refine the notion of MayThrow in LICM to include a header specific version
In LICM, we have a check for an instruction which is guaranteed to execute and thus can't introduce any new faults if moved to the preheader. To handle a function which might unconditionally throw when first called, we check for any potentially throwing call in the loop and give up.
This is unfortunate when the potentially throwing condition is down a rare path. It prevents essentially all LICM of potentially faulting instructions where the faulting condition is checked outside the loop. It also greatly diminishes the utility of loop unswitching since control dependent instructions - which are now likely in the loops header block - will not be lifted by subsequent LICM runs.
define void @nothrow_header(i64 %x, i64 %y, i1 %cond) {
; CHECK-LABEL: nothrow_header
; CHECK-LABEL: entry
; CHECK: %div = udiv i64 %x, %y
; CHECK-LABEL: loop
; CHECK: call void @use(i64 %div)
entry:
br label %loop
loop: ; preds = %entry, %for.inc
%div = udiv i64 %x, %y
br i1 %cond, label %loop-if, label %exit
loop-if:
call void @use(i64 %div)
br label %loop
exit:
ret void
}
The current patch really only helps with non-memory instructions (i.e. divs, etc..) since the maythrow call down the rare path will be considered to alias an otherwise hoistable load. The one exception is that it does kick in for loads which are known to be invariant without regard to other possible stores, i.e. those marked with either !invarant.load metadata of tbaa 'is constant memory' metadata.
Differential Revision: http://reviews.llvm.org/D6725
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224965
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Chandler Carruth [Mon, 29 Dec 2014 22:50:30 +0000 (22:50 +0000)]
[go] Teach the go cmake build functions to funnel the include directories down into the cgo-setup variables of llvm-go.
Summary:
This in turn allows us to use #includes with cgo that rely on CMake
provided include directories which is particularly useful for handling
generated headers that aren't reasonable to put in an "installable"
location.
Differential Revision: http://reviews.llvm.org/D6798
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224962
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Philip Reames [Mon, 29 Dec 2014 22:46:21 +0000 (22:46 +0000)]
Loading from null is valid outside of addrspace 0
This patches fixes a miscompile where we were assuming that loading from null is undefined and thus we could assume it doesn't happen. This transform is perfectly legal in address space 0, but is not neccessarily legal in other address spaces.
We really should introduce a hook to control this property on a per target per address space basis. We may be loosing valuable optimizations in some address spaces by being too conservative.
Original patch by Thomas P Raoux (submitted to llvm-commits), tests and formatting fixes by me.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224961
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Rafael Espindola [Mon, 29 Dec 2014 22:14:35 +0000 (22:14 +0000)]
Convert test to llvm-readobj. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224959
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Colin LeMahieu [Mon, 29 Dec 2014 21:33:45 +0000 (21:33 +0000)]
[Hexagon] Adding allocframe, post-increment circular immediate stores, post-increment circular register stores, and bit reversed post-increment stores.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224957
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Colin LeMahieu [Mon, 29 Dec 2014 21:18:02 +0000 (21:18 +0000)]
[Hexagon] Fixing 224952 where an addressing mode update was missed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224955
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Alexey Samsonov [Mon, 29 Dec 2014 20:59:02 +0000 (20:59 +0000)]
Remove unnecessary StringRef->std::string conversion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224953
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Colin LeMahieu [Mon, 29 Dec 2014 20:44:51 +0000 (20:44 +0000)]
[Hexagon] Adding post-increment register form stores and register-immediate form stores with tests.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224952
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Colin LeMahieu [Mon, 29 Dec 2014 20:00:43 +0000 (20:00 +0000)]
[Hexagon] Replacing the remaining postincrement stores with versions that have encoding bits.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224951
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Rafael Espindola [Mon, 29 Dec 2014 19:50:32 +0000 (19:50 +0000)]
Convert test to FileCheck. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224950
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Colin LeMahieu [Mon, 29 Dec 2014 19:42:14 +0000 (19:42 +0000)]
[Hexagon] Renaming old multiclass for removal. Adding post-increment store classes and instruction defs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224949
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Chandler Carruth [Mon, 29 Dec 2014 19:36:05 +0000 (19:36 +0000)]
[py3] Teach the CMake build to reject Python versions older than 2.7.
Continue to require Python 2 however as recent experiments suggest
LLDB's build requires it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224948
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