LoopRotate: When reconstructing loop simplify form don't split edges
from indirectbrs.
Yet another chapter in the endless story. While this looks like we leave
the loop in a non-canonical state this replicates the logic in
LoopSimplify so it doesn't diverge from the canonical form in any way.
PR21968
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MC: Allow multiple comma-separated expressions on the .uleb128
directive.
For compatiblity with GNU as. Binutils documents this as
'.uleb128 expressions'. Subtle, isn't it?
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Filip Pizlo pointed out that this changes the C API.
It's too late in the release process to figure out how we want to
handle this. Reverting the patch is essentially a way of buying time:
we don't change the API at the source level for now, we're not
trying to fix it with a last-minute patch with a risk of unintended
effects, and we preserve our options for fixing this in 3.6.1.
This is not ideal, but I think it's the best compromise at this stage.
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r229731 | sanjoy | 2015-02-18 11:32:25 -0800 (Wed, 18 Feb 2015) | 10 lines
Partial fix for bug 22589
Don't spend the entire iteration space in the scalar loop prologue if
computing the trip count overflows. This change also gets rid of the
backedge check in the prologue loop and the extra check for
overflowing trip-count.
Differential Revision: http://reviews.llvm.org/D7715
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r229352 | majnemer | 2015-02-15 20:02:09 -0800 (Sun, 15 Feb 2015) | 8 lines
IR: Properly return nullptr when getAggregateElement is out-of-bounds
We didn't properly handle the out-of-bounds case for
ConstantAggregateZero and UndefValue. This would manifest as a crash
when the constant folder was asked to fold a load of a constant global
whose struct type has no operands.
This fixes PR22595.
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r229529 | rnk | 2015-02-17 12:02:34 -0800 (Tue, 17 Feb 2015) | 8 lines
Expose LLVM_VERSION_PATCH in llvm-config.h
There was no reason to keep this private in config.h, and users
requested that it be available in PR22615.
Also fix a bug where patch versions of '0' would cause the macro to
remain undefined. The "#cmakedefine" command only creates a macro if the
named variable would be considered true in the context of an if().
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r229495 | delena | 2015-02-17 05:10:05 -0800 (Tue, 17 Feb 2015) | 8 lines
Fixed a bug in store sinking.
The problem was in store-sink barrier check.
Store sink barrier should be checked for ModRef (read-write) mode.
http://llvm.org/bugs/show_bug.cgi?id=22613
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r226808 | delena | 2015-01-22 04:07:59 -0800 (Thu, 22 Jan 2015) | 10 lines
Fixed a bug in type legalizer for masked load/store intrinsics.
The problem occurs when after vectorization we have type
<2 x i32>. This type is promoted to <2 x i64> and then requires
additional efforts for expanding loads and truncating stores.
I added EXPAND / TRUNCATE attributes to the masked load/store
SDNodes. The code now contains additional shuffles.
I've prepared changes in the cost estimation for masked memory
operations, it will be submitted separately.
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r226791 | delena | 2015-01-22 00:20:06 -0800 (Thu, 22 Jan 2015) | 7 lines
Fixed a bug in masked load/store in reversed loop.
Added a test.
The bug was submitted to bugzilla:
http://llvm.org/bugs/show_bug.cgi?id=22225
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r229421 | dexonsmith | 2015-02-16 11:18:01 -0800 (Mon, 16 Feb 2015) | 33 lines
Bitcode: Fix major regression: large files w/ debug info
The metadata/value split introduced a major regression reading large
bitcode files that contain debug info (or other cyclic (non-self
reference) metadata graphs). For the first time in a while, I dropped
from libLTO.dylib down to `llvm-lto` with a non-trivial bitcode file
(~350MB), and I hit this when reading the result of ld64's `-save-temps`
in `llvm-lto`.
Here's pseudo-code for what was going on:
read-main-metadata-block:
for each md:
if has-fwd-ref: // Only true for cyclic graphs.
any-fwd-refs <- true
if any-fwd-refs:
foreach md:
resolve-cycles(md) // Handle cycles.
foreach function:
read-function-metadata-block: // Such as !alias, !loop
if any-fwd-refs:
foreach md: // (all metadata, not just this block)
resolve-cycles(md) // A no-op, but the loop is expensive!!
This commit resets the `AnyFwdRefs` flag to `false`. This on its own
was enough to change my Release+Asserts `llvm-lto` time for reading this
bitcode from over 20 minutes (I gave up on it) to 20 seconds. I've gone
further by tracking the min/max metadata forward-references in a
metadata block. This protects against a schema that has lots of
functions that each reference their own metadata cycle.
Unfortunately, this regression is in the 3.6 branch as well.
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r229029 | chandlerc | 2015-02-12 18:30:01 -0800 (Thu, 12 Feb 2015) | 16 lines
[IC] Fix a bug with the instcombine canonicalizing of loads and
propagating of metadata.
We were propagating !nonnull metadata even when the newly formed load is
no longer of a pointer type. This is clearly broken and results in LLVM
failing the verifier and aborting. This patch just restricts the
propagation of !nonnull metadata to when we actually have a pointer
type.
This bug report and the initial version of this patch was provided by
Charles Davis! Many thanks for finding this!
We still need to add logic to round-trip the metadata correctly if we
combine from pointer types to integer types and then back by using range
metadata for the integer type loads. But this is the minimal and safe
version of the patch, which is important so we can backport it into 3.6.
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r228969 | hfinkel | 2015-02-12 14:43:52 -0800 (Thu, 12 Feb 2015) | 7 lines
[SDAG] Don't try to use FP_EXTEND/FP_ROUND for int<->fp promotions
The PowerPC backend has long promoted some floating-point vector operations
(such as select) to integer vector operations. Unfortunately, this behavior was
broken by r216555. When using FP_EXTEND/FP_ROUND for promotions, we must check
that both the old and new types are floating-point types. Otherwise, we must
use BITCAST as we did prior to r216555 for everything.
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r226616 | adrian | 2015-01-20 14:37:25 -0800 (Tue, 20 Jan 2015) | 2 lines
DebugLocs without a scope should fail the verification.
Follow-up to r226588.
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r226588 | adrian | 2015-01-20 10:03:37 -0800 (Tue, 20 Jan 2015) | 1 line
Add an assertion and prefer a crash over an infinite loop.
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r228979 | majnemer | 2015-02-12 15:26:26 -0800 (Thu, 12 Feb 2015) | 8 lines
X86: Don't crash if we can't decode the pshufb mask
Constant pool entries are uniqued by their contents regardless of their
type. This means that a pshufb can have a shuffle mask which isn't a
simple array of bytes.
The code path which attempts to decode the mask didn't check for
failure, causing PR22559.
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r228957 | bsteinbr | 2015-02-12 13:04:22 -0800 (Thu, 12 Feb 2015) | 14 lines
Fix a crash in the assumption cache when inlining indirect function calls
Summary:
Instances of the AssumptionCache are per function, so we can't re-use
the same AssumptionCache instance when recursing in the CallAnalyzer to
analyze a different function. Instead we have to pass the
AssumptionCacheTracker to the CallAnalyzer so it can get the right
AssumptionCache on demand.
Reviewers: hfinkel
Subscribers: llvm-commits, hans
Differential Revision: http://reviews.llvm.org/D7533
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r228842 | jvoung | 2015-02-11 08:12:50 -0800 (Wed, 11 Feb 2015) | 17 lines
Gold-plugin: Broaden scope of get/release_input_file to scope of Module.
Summary:
Move calls to get_input_file and release_input_file out of
getModuleForFile(). Otherwise release_input_file may end up
unmapping a view of the file while the view is still being
used by the Module (on 32-bit hosts).
Fix for PR22482.
Test Plan: Add test using --no-map-whole-files.
Reviewers: rafael, nlewycky
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D7539
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r228899 | chandlerc | 2015-02-11 18:30:56 -0800 (Wed, 11 Feb 2015) | 28 lines
[slp] Fix a nasty bug in the SLP vectorizer that Joerg pointed out.
Apparently some code finally started to tickle this after my
canonicalization changes to instcombine.
The bug stems from trying to form a vector type out of scalars that
aren't compatible at all. In this example, from x86_mmx values. The code
in the vectorizer that checks for reasonable types whas checking for
aggregates or vectors, but there are lots of other types that should
just never reach the vectorizer.
Debugging this was made more confusing by the lie in an assert in
VectorType::get() -- it isn't that the types are *primitive*. The types
must be integer, pointer, or floating point types. No other types are
allowed.
I've improved the assert and added a helper to the vectorizer to handle
the element type validity checks. It now re-uses the VectorType static
function and then further excludes weird target-specific types that we
probably shouldn't be touching here (x86_fp80 and ppc_fp128). Neither of
these are really reachable anyways (neither 80-bit nor 128-bit things
will get vectorized) but it seems better to just eagerly exclude such
nonesense.
I've added a test case, but while it definitely covers two of the paths
through this code there may be more paths that would benefit from test
coverage. I'm not familiar enough with the SLP vectorizer to synthesize
test cases for all of these, but was able to update the code itself by
inspection.
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r225904 | rnk | 2015-01-13 17:05:27 -0800 (Tue, 13 Jan 2015) | 27 lines
CodeGen support for x86_64 SEH catch handlers in LLVM
This adds handling for ExceptionHandling::MSVC, used by the
x86_64-pc-windows-msvc triple. It assumes that filter functions have
already been outlined in either the frontend or the backend. Filter
functions are used in place of the landingpad catch clause type info
operands. In catch clause order, the first filter to return true will
catch the exception.
The C specific handler table expects the landing pad to be split into
one block per handler, but LLVM IR uses a single landing pad for all
possible unwind actions. This patch papers over the mismatch by
synthesizing single instruction BBs for every catch clause to fill in
the EH selector that the landing pad block expects.
Missing functionality:
- Accessing data in the parent frame from outlined filters
- Cleanups (from __finally) are unsupported, as they will require
outlining and parent frame access
- Filter clauses are unsupported, as there's no clear analogue in SEH
In other words, this is the minimal set of changes needed to write IR to
catch arbitrary exceptions and resume normal execution.
Reviewers: majnemer
Differential Revision: http://reviews.llvm.org/D6300
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r228793 | bogner | 2015-02-10 18:52:44 -0800 (Tue, 10 Feb 2015) | 12 lines
InstrProf: Lower coverage mappings by setting their sections appropriately
Add handling for __llvm_coverage_mapping to the InstrProfiling
pass. We need to make sure the constant and any profile names it
refers to are in the correct sections, which is easier and cleaner to
do here where we have to know about profiling sections anyway.
This is really tricky to test without a frontend, so I'm committing
the test for the fix in clang. If anyone knows a good way to test this
within LLVM, please let me know.
Fixes PR22531.
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r228656 | chandlerc | 2015-02-09 18:25:56 -0800 (Mon, 09 Feb 2015) | 16 lines
[x86] Fix PR22524: the DAG combiner was incorrectly handling illegal
nodes when folding bitcasts of constants.
We can't fold things and then check after-the-fact whether it was legal.
Once we have formed the DAG node, arbitrary other nodes may have been
collapsed to it. There is no easy way to go back. Instead, we need to
test for the specific folding cases we're interested in and ensure those
are legal first.
This could in theory make this less powerful for bitcasting from an
integer to some vector type, but AFAICT, that can't actually happen in
the SDAG so its fine. Now, we *only* whitelist specific int->fp and
fp->int bitcasts for post-legalization folding. I've added the test case
from the PR.
(Also as a note, this does not appear to be in 3.6, no backport needed)
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r228525 | bsteinbr | 2015-02-08 09:07:14 -0800 (Sun, 08 Feb 2015) | 14 lines
Correctly combine alias.scope metadata by a union instead of intersecting
Summary:
The alias.scope metadata represents sets of things an instruction might
alias with. When generically combining the metadata from two
instructions the result must be the union of the original sets, because
the new instruction might alias with anything any of the original
instructions aliased with.
Reviewers: hfinkel
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D7490
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r228518 | tnorthover | 2015-02-07 16:50:47 -0800 (Sat, 07 Feb 2015) | 15 lines
ARM & AArch64: teach LowerVSETCC that output type size may differ from input.
While various DAG combines try to guarantee that a vector SETCC
operation will have the same output size as input, there's nothing
intrinsic to either creation or LegalizeTypes that actually guarantees
it, so the function needs to be ready to handle a mismatch.
Fortunately this is easy enough, just extend or truncate the naturally
compared result.
I couldn't reproduce the failure in other backends that I know have
SIMD, so it's probably only an issue for these two due to shared
heritage.
Should fix PR21645.
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r228507 | joerg | 2015-02-07 13:24:06 -0800 (Sat, 07 Feb 2015) | 4 lines
Avoid integer overflows around realloc calls resulting in potential
heap. Problem identified by Guido Vranken. Changes differ from original
OpenBSD sources by not depending on non-portable reallocarray.
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r228490 | majnemer | 2015-02-07 00:26:40 -0800 (Sat, 07 Feb 2015) | 5 lines
MC: Emit COFF section flags in the "proper" order
COFF section flags are not idempotent:
'rd' will make a read-write section because 'd' implies write
'dr' will make a read-only section because 'r' disables write
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r228444 | eugenis | 2015-02-06 13:47:39 -0800 (Fri, 06 Feb 2015) | 8 lines
[msan] Fix "missing origin" in atomic store.
An atomic store always make the target location fully initialized (in the
current implementation). It should not store origin. Initialized memory can't
have meaningful origin, and, due to origin granularity (4 bytes) there is a
chance that this extra store would overwrite meaningfull origin for an adjacent
location.
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r228331 | sylvestre | 2015-02-05 10:57:02 -0800 (Thu, 05 Feb 2015) | 30 lines
Fix an incorrect identifier
Summary:
EIEIO is not a correct declaration and breaks the build under Debian HURD.
Instead, E_IEIO is used.
//
http://www.gnu.org/software/libc/manual/html_node/Reserved-Names.html
Some additional classes of identifier names are reserved for future
extensions to the C language or the POSIX.1 environment. While using
these names for your own purposes right now might not cause a problem,
they do raise the possibility of conflict with future versions of the C
or POSIX standards, so you should avoid these names.
...
Names beginning with a capital ?\226?\128?\152E?\226?\128?\153 followed a digit or uppercase letter
may be used for additional error code names. See Error Reporting.//
Reported here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776965
And patch wrote by Svante Signell
With this patch, LLVM, Clang & LLDB build under Debian HURD:
https://buildd.debian.org/status/fetch.php?pkg=llvm-toolchain-3.6&arch=hurd-i386&ver=1%3A3.6~%2Brc2-2&stamp=1423040039
Reviewers: hfinkel
Reviewed By: hfinkel
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D7437
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r227815 | spatel | 2015-02-02 09:47:30 -0800 (Mon, 02 Feb 2015) | 2 lines
fix typo
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r227972 | spatel | 2015-02-03 07:37:18 -0800 (Tue, 03 Feb 2015) | 10 lines
Improve test to actually check for a folded load.
This test was checking for lack of a "movaps" (an aligned load)
rather than a "movups" (an unaligned load). It also included
a store which complicated the checking.
Add specific CPU runs to prevent subtarget feature flag overrides
from inhibiting this optimization.
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r227983 | spatel | 2015-02-03 09:13:04 -0800 (Tue, 03 Feb 2015) | 22 lines
Fix program crashes due to alignment exceptions generated for SSE memop instructions (PR22371).
r224330 introduced a bug by misinterpreting the "FeatureVectorUAMem" bit.
The commit log says that change did not affect anything, but that's not correct.
That change allowed SSE instructions to have unaligned mem operands folded into
math ops, and that's not allowed in the default specification for any SSE variant.
The bug is exposed when compiling for an AVX-capable CPU that had this feature
flag but without enabling AVX codegen. Another mistake in r224330 was not adding
the feature flag to all AVX CPUs; the AMD chips were excluded.
This is part of the fix for PR22371 ( http://llvm.org/bugs/show_bug.cgi?id=22371 ).
This feature bit is SSE-specific, so I've renamed it to "FeatureSSEUnalignedMem".
Changed the existing test case for the feature bit to reflect the new name and
renamed the test file itself to better reflect the feature.
Added runs to fold-vex.ll to check for the failing codegen.
Note that the feature bit is not set by default on any CPU because it may require a
configuration register setting to enable the enhanced unaligned behavior.
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r228303 | thomas.stellard | 2015-02-05 10:32:18 -0500 (Thu, 05 Feb 2015) | 11 lines
R600/SI: Fix bug in TTI loop unrolling preferences
We should be setting UnrollingPreferences::MaxCount to MAX_UINT instead
of UnrollingPreferences::Count.
Count is a 'forced unrolling factor', while MaxCount sets an upper
limit to the unrolling factor.
Setting Count to MAX_UINT was causing the loop in the testcase to be
unrolled 15 times, when it only had a maximum of 4 iterations.
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r228302 | thomas.stellard | 2015-02-05 10:32:15 -0500 (Thu, 05 Feb 2015) | 34 lines
R600/SI: Fix bug from insertion of llvm.SI.end.cf into loop headers
The llvm.SI.end.cf intrinsic is used to mark the end of if-then blocks,
if-then-else blocks, and loops. It is responsible for updating the
exec mask to re-enable threads that had been masked during the preceding
control flow block. For example:
s_mov_b64 exec, 0x3 ; Initial exec mask
s_mov_b64 s[0:1], exec ; Saved exec mask
v_cmpx_gt_u32 exec, s[2:3], v0, 0 ; llvm.SI.if
do_stuff()
s_or_b64 exec, exec, s[0:1] ; llvm.SI.end.cf
The bug fixed by this patch was one where the llvm.SI.end.cf intrinsic
was being inserted into the header of loops. This would happen when
an if block terminated in a loop header and we would end up with
code like this:
s_mov_b64 exec, 0x3 ; Initial exec mask
s_mov_b64 s[0:1], exec ; Saved exec mask
v_cmpx_gt_u32 exec, s[2:3], v0, 0 ; llvm.SI.if
do_stuff()
LOOP: ; Start of loop header
s_or_b64 exec, exec, s[0:1] ; llvm.SI.end.cf <-BUG: The exec mask has the
same value at the beginning of each loop
iteration.
do_stuff();
s_cbranch_execnz LOOP
The fix is to create a new basic block before the loop and insert the
llvm.SI.end.cf there. This way the exec mask is restored before the
start of the loop instead of at the beginning of each iteration.
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Joerg Sonnenberger
Tom Stellard
Hans Wennborg
Hal Finkel
Reid Kleckner
Peter Collingbourne
Kai Nacke
Josh Klontz
Daniel Sanders