Hal Finkel [Mon, 31 Aug 2015 18:38:55 +0000 (18:38 +0000)]
[DAGCombine] Remove some old dead code for forming SETCC nodes
This code was dead when it was committed in r23665 (Oct 7, 2005), and before it
reaches its 10th anniversary, it really should go. We can always bring it back
if we'd like, but it forms more SETCC nodes, and the way we do legality
checking on SETCC nodes is wrong in a number of places, and removing this means
fewer places to fix. NFC.
Philip Reames [Mon, 31 Aug 2015 18:31:48 +0000 (18:31 +0000)]
[LazyValueInfo] Look through Phi nodes when trying to prove a predicate
If asked to prove a predicate about a value produced by a PHI node, LazyValueInfo was unable to do so even if the predicate was known to be true for each input to the PHI. This prevented JumpThreading from eliminating a provably redundant branch.
The problematic test case looks something like this:
ListNode *p = ...;
while (p != null) {
if (!p) return;
x = g->x; // unrelated
p = p->next
}
The null check at the top of the loop is redundant since the value of 'p' is null checked on entry to the loop and before executing the backedge. This resulted in us a) executing an extra null check per iteration and b) not being able to LICM unrelated loads after the check since we couldn't prove they would execute or that their dereferenceability wasn't effected by the null check on the first iteration.
Kit Barton [Mon, 31 Aug 2015 18:26:45 +0000 (18:26 +0000)]
Rework of the new interface for shrink wrapping
Based on comments from Hal
(http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20150810/292978.html),
I've changed the interface to add a callback mechanism to the
TargetFrameLowering class to query whether the specific target
supports shrink wrapping. By default, shrink wrapping is disabled by
default. Each target can override the default behaviour using the
TargetFrameLowering::targetSupportsShrinkWrapping() method. Shrink
wrapping can still be explicitly enabled or disabled from the command
line, using the existing -enable-shrink-wrap=<true|false> option.
Matthias Braun [Mon, 31 Aug 2015 18:25:15 +0000 (18:25 +0000)]
AArch64: Fix loads to lower NEON vector lanes using GPR registers
The ISelLowering code turned insertion turned the element for the
lowest lane of a BUILD_VECTOR into an INSERT_SUBREG, this prohibited
the patterns for SCALAR_TO_VECTOR(Load) to match later. Restrict this
to cases without a load argument.
Matthias Braun [Mon, 31 Aug 2015 18:25:11 +0000 (18:25 +0000)]
X86: Fix FastISel SSESelect register class
X86FastISel has been using the wrong register class for VBLENDVPS which
produces a VR128 and needs an extra copy to the target register. The
problem was already hit by the existing test cases when using
> llvm-lit -Dllc="llc -verify-machineinstr"
[BitcodeReader] Ensure we can read constant vector selects with an i1 condition
Summary:
Constant vectors weren't allowed to have an i1 condition in the
BitcodeReader. Make sure we have the same restrictions that are
documented, not more.
Karl Schimpf [Mon, 31 Aug 2015 17:55:32 +0000 (17:55 +0000)]
Build a lib/Fuzzer version for llvm-as.
Summary:
This CL is associated with a fuzzing effort to find bugs in LLVM. The
first step is to fuzz llvm-as to find potential issues in generating
IR. Both afl-fuzz and LLVM's lib/Fuzzer are being used.
This CL introduces the executable that implements the in-process
fuzzer using LLVM's lib/Fuzzer. The motivation for using lib/Fuzzer is
based on time comparisons between afl-fuzz and lib/Fuzzer. Early
results show that per-process, the lib/Fuzzer implemenation of llvm-as
(i.e. this CL) generates over 30 times the number of mutations found
by afl-fuzz, per hour runtime. The speedup is due to the removal of
overhead of forking a process, and loading the executable into memory.
I placed this under the tools directory, since it is an executable. It
is also only conditionally built if (using cmake) the flag
LLVM_USEE_SANITIZE_COVERAGE is used, so that it isn't built by
default.
Vedant Kumar [Mon, 31 Aug 2015 17:44:53 +0000 (17:44 +0000)]
[MC/AsmParser] Avoid setting MCSymbol.IsUsed in some cases
Avoid marking some MCSymbols as used in MC/AsmParser.cpp when no uses
exist. This fixes a bug in parseAssignmentExpression() which
inadvertently sets IsUsed, thereby triggering:
"invalid re-assignment of non-absolute variable"
on otherwise valid code. No other functionality change intended.
The original version of this patch touched many calls to MCSymbol
accessors. On rafael's advice, I have stripped this patch down a bit.
As a follow-up, I intend to find the call sites which intentionally set
IsUsed and force them to do so explicitly.
Naomi Musgrave [Mon, 31 Aug 2015 15:57:40 +0000 (15:57 +0000)]
Repress sanitization on User dtor. Modify msan macros for applying attribute
to repress sanitization. Move attribute for repressing sanitization to
operator delete for User, MDNode.
Summary: In response to bug 24578, reported against failing LLVM test.
Hal Finkel [Mon, 31 Aug 2015 07:51:36 +0000 (07:51 +0000)]
[AggressiveAntiDepBreaker] Check for EarlyClobber on defining instruction
AggressiveAntiDepBreaker was doing some EarlyClobber checking, but was not
checking that the register being potentially renamed was defined by an
early-clobber def where there was also a use, in that instruction, of the
register being considered as the target of the rename. Fixes PR24014.
Jingyue Wu [Mon, 31 Aug 2015 06:10:27 +0000 (06:10 +0000)]
[JumpThreading] make jump threading respect convergent annotation.
Summary:
JumpThreading shouldn't duplicate a convergent call, because that would move a convergent call into a control-inequivalent location. For example,
if (cond) {
...
} else {
...
}
convergent_call();
if (cond) {
...
} else {
...
}
should not be optimized to
if (cond) {
...
convergent_call();
...
} else {
...
convergent_call();
...
}
Frederic Riss [Mon, 31 Aug 2015 05:09:32 +0000 (05:09 +0000)]
[dsymutil] Do not crash on empty debug_range range.
The fix is trivial (The actual patch is 2 lines, but as it changes
indentation it looks like more).
clang does not produce this kind of (slightly bogus) debug info
anymore, thus I had to rely on a hand-crafted assembly test to trigger
that case.
Frederic Riss [Mon, 31 Aug 2015 01:43:14 +0000 (01:43 +0000)]
[dsymutil] Fix handling of inlined_subprogram low_pcs
The value of an inlined subprogram low_pc attribute should not
get relocated, but it can happen that it matches the enclosing
function's start address and thus gets the generic treatment.
Special case it to avoid applying the PC offset twice.
Support: Support LLVM_ENABLE_THREADS=0 in llvm/Support/thread.h.
Specifically, the header now provides llvm::thread, which is either a
typedef of std::thread or a replacement that calls the function synchronously
depending on the value of LLVM_ENABLE_THREADS.
Hal Finkel [Sun, 30 Aug 2015 22:12:50 +0000 (22:12 +0000)]
[PowerPC] Fixup SELECT_CC (and SETCC) patterns with i1 comparison operands
There were really two problems here. The first was that we had the truth tables
for signed i1 comparisons backward. I imagine these are not very common, but if
you have:
setcc i1 x, y, LT
this has the '0 1' and the '1 0' results flipped compared to:
setcc i1 x, y, ULT
because, in the signed case, '1 0' is really '-1 0', and the answer is not the
same as in the unsigned case.
The second problem was that we did not have patterns (at all) for the unsigned
comparisons select_cc nodes for i1 comparison operands. This was the specific
cause of PR24552. These had to be added (and a missing Altivec promotion added
as well) to make sure these function for all types. I've added a bunch more
test cases for these patterns, and there are a few FIXMEs in the test case
regarding code-quality.
Renato Golin [Sun, 30 Aug 2015 10:05:30 +0000 (10:05 +0000)]
Revert "New interface function is added to VectorUtils Value *getSplatValue(Value *Val);"
This reverts commit r246371, as it cause a rather obscure bug in AArch64
test-suite paq8p (time outs, seg-faults). I'll investigate it before
reapplying.
Chandler Carruth [Sun, 30 Aug 2015 09:54:34 +0000 (09:54 +0000)]
Stop calling the flat out insane ARM target parsing code unless the
architecture string is something quite weird. Similarly delay calling
the BPF parsing code, although that is more reasonable.
To understand why I was motivated to make this change, it cuts the time
for running the ADT TripleTest unittests by a factor of two in
non-optimized builds (the developer default) and reduces my 'check-llvm'
time by a full 15 seconds. The implementation of parseARMArch is *that*
slow. I tried to fix it in the prior series of commits, but frankly,
I have no idea how to finish fixing it. The entire premise of the
function (to allow 'v7a-unknown-linux' or some such to parse as an
'arm-unknown-linux' triple) seems completely insane to me, but I'll let
the ARM folks sort that out. At least it is now out of the critical path
of every developer working on LLVM. It also will likely make some other
folks' code significantly faster as I've heard reports of 2% of time
spent in triple parsing even in optimized builds!
I'm not done making this code faster, but I am done trying to improve
the ARM target parsing code.
Chandler Carruth [Sun, 30 Aug 2015 07:51:04 +0000 (07:51 +0000)]
Teach the target parsing framework to directly compute the length of all
of its strings when expanding the string literals from the macros, and
push all of the APIs to be StringRef instead of C-string APIs.
This (remarkably) removes a very non-trivial number of strlen calls. It
even deletes code and complexity from one of the primary users -- Clang.
Hal Finkel [Sun, 30 Aug 2015 07:50:35 +0000 (07:50 +0000)]
[PowerPC/MIR Serialization] Target flags serialization support
Add support for MIR serialization of PowerPC-specific operand target flags
(based on the generic infrastructure added in r244185 and r245383).
I won't even pretend that this is good test coverage, but this includes the
regression test associated with r246372. Adding an MIR test for that fix is far
superior to adding an IR-level test because particular instruction-scheduling
decisions are necessary in order to expose the bug, and using an MIR test we
can start the pipeline post-scheduling.
Hal Finkel [Sun, 30 Aug 2015 07:44:05 +0000 (07:44 +0000)]
[PowerPC] Don't assume ADDISdtprelHA's source is r3
Even through ADDISdtprelHA generally has r3 as its source register, it is
possible for the instruction scheduler to move things around such that some
other register is the source. We need to print the actual source register, not
always r3. Fixes PR24394.
The test case will come in a follow-up commit because it depends on MIR
target-flags parsing.
New interface function is added to VectorUtils
Value *getSplatValue(Value *Val);
It complements the CreateVectorSplat(), which creates 2 instructions - insertelement and shuffle with all-zero mask.
The new function recognizes the pattern - insertelement+shuffle and returns the splat value (or nullptr).
It also returns a splat value form ConstantDataVector, for completeness.
Chandler Carruth [Sun, 30 Aug 2015 05:27:31 +0000 (05:27 +0000)]
Refactor the ARM target parsing to use a def file with macros to expand
the necessary tables.
This will allow me to restructure the code and structures using this to
be significantly more efficient. It also removes the duplication of the
list of several enumerators. It also enshrines that the order of
enumerators match the order of the entries in the tables, something the
implementation code actually uses.
Chandler Carruth [Sun, 30 Aug 2015 02:17:15 +0000 (02:17 +0000)]
[Triple] Use clang-format to normalize the formatting of the ARM target
parsing logic prior to making substantial changes to it.
This parsing logic is incredibly wasteful, so I'm planning to rewrite
it. Just unittesting the triple parsing logic spends well over 80% of
its time in the ARM parsing logic, and others have measured significant
time spent here in real production compiles.
Chandler Carruth [Sun, 30 Aug 2015 02:09:48 +0000 (02:09 +0000)]
[Triple] Stop abusing a class to have only static methods and just use
the namespace that we are already using for the enums that are produced
by the parsing.
James Molloy [Sat, 29 Aug 2015 10:49:11 +0000 (10:49 +0000)]
[ARM] Hoist fabs/fneg above a conversion to float.
This is especially visible in softfp mode, for example in the implementation of libm fabs/fneg functions. If we have:
%1 = vmovdrr r0, r1
%2 = fabs %1
then move the fabs before the vmovdrr:
%1 = and r1, #0x7FFFFFFF
%2 = vmovdrr r0, r1
This is never a lose, and could be a serious win because the vmovdrr may be followed by a vmovrrd, which would enable us to remove the conversion into FPRs completely.
We already do this for f32, but not for f64. Tests are added for both.
Matt Arsenault [Sat, 29 Aug 2015 07:16:50 +0000 (07:16 +0000)]
AMDGPU: Add sdst operand to VOP2b instructions
The VOP3 encoding of these allows any SGPR pair for the i1
output, but this was forced before to always use vcc.
This doesn't yet try to use this, but does add the operand
to the definitions so the main change is adding vcc to the
output of the VOP2 encoding.
Matt Arsenault [Sat, 29 Aug 2015 06:48:46 +0000 (06:48 +0000)]
AMDGPU: Fix dropping mem operands when moving to VALU
Without a memory operand, mayLoad or mayStore instructions
are treated as hasUnorderedMemRef, which results in much worse
scheduling.
We really should have a verifier check that any
non-side effecting mayLoad or mayStore has a memory operand.
There are a few instructions (interp and images) which I'm
not sure what / where to add these.
Tom Stellard [Sat, 29 Aug 2015 01:58:21 +0000 (01:58 +0000)]
AMDGPU/SI: Fix some invaild assumptions when folding 64-bit immediates
Summary:
We were assuming tha if the use operand had a sub-register that
the immediate was 64-bits, but this was breaking the case of
folding a 64-bit immediate into another 64-bit instruction.
DI: Update tests before adding !dbg subprogram attachments
I'm working on adding !dbg attachments to functions (PR23367), which
we'll use to determine the canonical subprogram for a function (instead
of the `subprograms:` array in the compile units). This updates a few
old tests in preparation.
Transforms/Mem2Reg/ConvertDebugInfo2.ll had an old-style grep+count
based test that would start to fail because I've added an extra line
with `!dbg`. Instead, explicitly `CHECK` for what I think the test
actually cares about.
All three testcases have subprograms with a valid `function:` reference
-- which means my upgrade script will add a `!dbg` attachment -- but
that aren't referenced from any compile unit. I suspect these testcases
were handreduced over-zealously (or have bitrotted?). Add a reference
from the compile unit so that upcoming Verifier checks won't fail here.
DI: Set DILexicalBlock columns >= 65536 to 0/unknown
This fixes PR24621 and matches what we do for `DILocation`. Although
the limit seems somewhat artificial, there are places in the backend
that also assume 16-bit columns, so we may as well just be consistent
about the limits.
Add `Function::setSubprogram()` and `Function::getSubprogram()`,
convenience methods to forward to `setMetadata()` and `getMetadata()`,
respectively, and deal in `DISubprogram` instead of `MDNode`.
Also add a verifier check to enforce that `!dbg` attachments are always
subprograms.
Originally (when I had the llvm-dev discussion back in April) I thought
I'd store a pointer directly on `llvm::Function` for these attachments
-- we frequently have debug info, and that's much cheaper than using map
in the context if there are no other function-level attachments -- but
for now I'm just using the generic infrastructure. Let's add the extra
complexity only if this shows up in a profile.
Currently the DWARF backend requires that subprograms have a type, and
the type is ignored if it has an empty type array. The long term
direction here -- see PR23079 -- is instead to skip the type entirely if
there's no valid type.
It turns out we have cases in tree of missing types on subprograms, but
since they're not referenced by compile units, the backend never crashes
on them. One option would be to add a Verifier check that subprograms
have types, and fix the bitrot. However, this is a fair bit of churn
(20-30 testcases) that would be reversed anyway by PR23079.
I found this inconsistency because of a WIP patch and upgrade script for
PR23367 that started crashing on test/DebugInfo/2010-10-01-crash.ll.
This commit updates the testcase to reference the subprogram from the
compile unit, and fixes the resulting crash (in line with the direction
of PR23079). This also updates `DIBuilder` to stop assuming a non-null
pointer for the subroutine types.
David Majnemer [Fri, 28 Aug 2015 21:13:39 +0000 (21:13 +0000)]
Revert r246232 and r246304.
This reverts isSafeToSpeculativelyExecute's use of ReadNone until we
split ReadNone into two pieces: one attribute which reasons about how
the function reasons about memory and another attribute which determines
how it may be speculated, CSE'd, trap, etc.
As a follow-up to r246098, require `DISubprogram` definitions
(`isDefinition: true`) to be 'distinct'. Specifically, add an assembler
check, a verifier check, and bitcode upgrading logic to combat testcase
bitrot after the `DIBuilder` change.
While working on the testcases, I realized that
test/Linker/subprogram-linkonce-weak-odr.ll isn't relevant anymore. Its
purpose was to check for a corner case in PR22792 where two subprogram
definitions match exactly and share the same metadata node. The new
verifier check, requiring that subprogram definitions are 'distinct',
precludes that possibility.
I updated almost all the IR with the following script:
Petar Jovanovic [Fri, 28 Aug 2015 18:02:53 +0000 (18:02 +0000)]
[mips64][mcjit] Add N64R6 relocations tests and fix N64R2 tests
This patch adds a test for MIPS64R6 relocations, it corrects check
expressions for R_MIPS_26 and R_MIPS_PC16 relocations in MIPS64R2 test, and
it adds run for big endian in MIPS64R2 test.
Matt Arsenault [Fri, 28 Aug 2015 17:31:28 +0000 (17:31 +0000)]
Make MergeConsecutiveStores look at other stores on same chain
When combiner AA is enabled, look at stores on the same chain.
Non-aliasing stores are moved to the same chain so the existing
code fails because it expects to find an adajcent store on a consecutive
chain.
Because of how DAGCombiner tries these store combines,
MergeConsecutiveStores doesn't see the correct set of stores on the chain
when it visits the other stores. Each store individually has its chain
fixed before trying to merge consecutive stores, and then tries to merge
stores from that point before the other stores have been processed to
have their chains fixed. To fix this, attempt to use FindBetterChain
on any possibly neighboring stores in visitSTORE.
Suppose you have 4 32-bit stores that should be merged into 1 vector
store. One store would be visited first, fixing the chain. What happens is
because not all of the store chains have yet been fixed, 2 of the stores
are merged. The other 2 stores later have their chains fixed,
but because the other stores were already merged, they have different
memory types and merging the two different sized stores is not
supported and would be more difficult to handle.
JF Bastien [Fri, 28 Aug 2015 16:49:09 +0000 (16:49 +0000)]
Remove Merge Functions pointer comparisons
Summary:
This patch removes two remaining places where pointer value comparisons
are used to order functions: comparing range annotation metadata, and comparing
block address constants. (These are both rare cases, and so no actual
non-determinism was observed from either case).
The fix for range metadata is simple: the annotation always consists of a pair
of integers, so we just order by those integers.
The fix for block addresses is more subtle. Two constants are the same if they
are the same basic block in the same function, or if they refer to corresponding
basic blocks in each respective function. Note that in the first case, merging
is trivially correct. In the second, the correctness of merging relies on the
fact that the the values of block addresses cannot be compared. This change is
actually an enhancement, as these functions could not previously be merged (see
merge-block-address.ll).
There is still a problem with cross function block addresses, in that constants
pointing to a basic block in a merged function is not updated.
This also more robustly compares floating point constants by all fields of their
semantics, and fixes a dyn_cast/cast mixup.
A readnone tailcall may still have a chain of computation which follows
it that would invalidate a tailcall lowering. Don't skip the analysis
in such cases.
Rui Ueyama [Fri, 28 Aug 2015 07:40:30 +0000 (07:40 +0000)]
Re-apply r246276 - Object: Teach llvm-ar to create symbol table for COFF short import files
This patch includes a fix for a llvm-readobj test. With this patch,
the tool does no longer print out COFF headers for the short import
file, but that's probably desirable because the header for the short
import file is dummy.
Rui Ueyama [Fri, 28 Aug 2015 05:47:46 +0000 (05:47 +0000)]
Object: Teach llvm-ar to create symbol table for COFF short import files.
COFF short import files are special kind of files that contains only
DLL-exported symbol names. That's different from object files because
it has no data except symbol names.
This change implements a SymbolicFile interface for the short import
files so that symbol names can be accessed through that interface.
llvm-ar is now able to read the file and create symbol table entries
for short import files.
Ahmed Bougacha [Fri, 28 Aug 2015 01:49:59 +0000 (01:49 +0000)]
[CodeGen] Support (and default to) expanding READCYCLECOUNTER to 0.
For targets that didn't support this, this will let us respect the
langref instead of failing to select.
Note that we don't need to change the 32-bit x86/PPC lowerings (to
account for the result type/# difference) because they're both
custom and bypass type legalization.
Joseph Tremoulet [Fri, 28 Aug 2015 01:12:35 +0000 (01:12 +0000)]
[WinEH] Update coloring to handle nested cases cleanly
Summary:
Change the coloring algorithm in WinEHPrepare to visit a funclet's exits
in its parents' contexts and so properly classify the continuations of
nested funclets.
Also change the placement of cloned blocks to be deterministic and to
maintain the relative order of each funclet's blocks.
Add a lit test showing various patterns that require cloning, the last
several of which don't have CHECKs yet because they require cloning
entire funclets which is NYI.
Piotr Padlewski [Fri, 28 Aug 2015 01:01:57 +0000 (01:01 +0000)]
Constant propagation after hiting llvm.assume
After hitting @llvm.assume(X) we can:
- propagate equality that X == true
- if X is icmp/fcmp (with eq operation), and one of operand
is constant we can change all variables with constants in the same BasicBlock
Prior to this patch, we hadn't been marking StratifiedSets with the
appropriate StratifiedAttrs when handling the result of no-args call
instructions. This caused us to report NoAlias when handed, for
example, an escaped alloca and a result from an opaque function. Now we
properly mark the return value of said functions.
Thanks again to Chandler, Richard, and Nick for pinging me about this.
CodeGen: Introduce splitCodeGen and teach LTOCodeGenerator to use it.
llvm::splitCodeGen is a function that implements the core of parallel LTO
code generation. It uses llvm::SplitModule to split the module into linkable
partitions and spawning one code generation thread per partition. The function
produces multiple object files which can be linked in the usual way.
This has been threaded through to LTOCodeGenerator (and llvm-lto for testing
purposes). Separate patches will add parallel LTO support to the gold plugin
and lld.
projects / llvm / log