Summary:
The assume builder was non-deterministic when working on unamed values.
this patch fixes this.
Reviewers: jdoerfert
Reviewed By: jdoerfert
Subscribers: hiraditya, mgrang, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78616
This fixes a bug reported by Alex Renda on LLVMDev where mca did not correctly
mark a resource group as "reserved".
(See http://lists.llvm.org/pipermail/llvm-dev/2020-May/141485.html).
The issue was caused by a wrong check in function `initializeUsedResources`.
As a consequence of this, a resource group was left unreserved, and its field
`NumUnits` incorrectly reported an unrealistic number of consumed resource
units.
This patch fixes the issue with the handling of reserved resources in the
InstrBuilder class, and adds a simple test for it. Ideally, as suggested by
Andy Trick, most of these problems will disappear if in the future we will
introduce a (optional) DelayCycles vector for SchedWriteRes.
Summary: with this patch the assume salvageKnowledge will not generate assume if all knowledge is already available in an assume with valid context. assume bulider can also in some cases update an existing assume with better information.
Reviewers: jdoerfert
Reviewed By: jdoerfert
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78014
Even a 2003 version of gcov_read_string does not have the behavior
described by rL204881. The wrong impression might come from
libclang_rt.profile (GCDAProfiling.c)'s corrupted output (since the
initial import rL144865). Note, the corrupted output crashes gcov.
GCDAProfiling.c unnecessarily writes function names to .gcda files.
GCC 4.2 gcc/libgcov.c (now renamed to libgcc/libgcov*) did not write function
names. gcov-7 (compatible) crashes on .gcda produced by libclang_rt.profile
rL176173 realized the problem and introduced a mode to remove function
names.
llvm-cov code apparently takes GCDAProfiling.c output format as truth
and tries to decode function names. Additionally, llvm-cov tries to
decode tags in certain order which does not match libgcov emitted .gcda
files.
This patch fixes the .gcda decoder and makes it work with GCC 8 and 9
(10 is compatible with 9). Note, line statistics are broken and not
fixed by this patch.
Add test/tools/llvm-cov/gcov-{4.7,8,9}.c to test compatibility.
Currently LAA's uses of ScalarEvolutionExpander blocks moving the
expander from Analysis to Transforms. Conceptually the expander does not
fit into Analysis (it is only used for code generation) and
runtime-check generation also seems to be better suited as a
transformation utility.
Reviewers: Ayal, anemet
Reviewed By: Ayal
Differential Revision: https://reviews.llvm.org/D78460
We have a transform in the opposite direction only for the x86 MMX type,
Other types are not handled either way before this patch.
The motivating case from PR45748:
https://bugs.llvm.org/show_bug.cgi?id=45748
...is the last test diff. In that example, we are triggering an existing
bitcast transform, so we reduce the number of casts, and that should give
us the ideal x86 codegen.
Differential Revision: https://reviews.llvm.org/D79171
This test would break with the proposed change to IR canonicalization
in D79171.
The test tried to do the right thing by only using -mem2reg with opt,
but it was using -O3 before that step, so the opt part was meaningless.
This test would break with the proposed change to IR canonicalization
in D79171. The raw unoptimized IR from clang is massive, so I've
replaced -instcombine with -mem2reg to make it more manageable,
but still be unlikely to break with unrelated changed to optimization.
Fold or(zext(bitreverse(x)),shl(zext(bitreverse(y)),bw/2) -> bitreverse(or(zext(x),shl(zext(y),bw/2))
Practically this is the same as the BSWAP pattern so we might as well handle it.
Functions checking whether an SSA value is a valid dimension or symbol for
affine operations can be called on values defined in a detached region (a
region that is not yet attached to an operation), for example, during parsing
or operation construction. These functions will attempt to uncondtionally
dereference a pointer to the parent operation of a region, which may be null
(as fixed by the previous commit, uninitialized before that). Since one cannot
know to which operation a region will be attached, conservatively this
operation would not be a valid affine scope and act accordingly, instead of
crashing.
Region has a default constructor that is called when a region is constructed
while an operation is being created, and therefore before the region can be
attached to this operation. The `container` field is uninitialized, which makes
it impossible to check programmatically if a Region is attached to an operation
or not, leading to sly memory errors when this field is read. Initialize it to
nullptr by default and thus make sure one can check if a region is attached to
an operation or not.
In order to reduce the API surface area (preparation for D78460), remove
a addRuntimeChecks() function and do the additional check in the single
caller.
Reviewers: Ayal, anemet
Reviewed By: Ayal
Differential Revision: https://reviews.llvm.org/D79679
We can combine a floating-point extension cast with a conversion
from integer if we know the earlier cast is exact.
This is an optimization suggested in PR36617:
https://bugs.llvm.org/show_bug.cgi?id=36617#c19
However, this patch does not change the example suggested there.
This patch only uses the existing analysis to handle cases where
the integer source value magnitude is narrower than the
intermediate FP mantissa (guarantees that the conversion to FP is
exact). Follow-up patches to the analysis function can enable
more cases.
Differential Revision: https://reviews.llvm.org/D79116
Summary:
PCH format is unstable, hence using a preamble built with a different
version of clang (or even worse, a different compiler) might result in
unexpected behaviour.
PCH creation on the other hand is something clangd wouldn't want to perform, as
it doesn't generate any output files.
This patch makes sure clangd drops any PCH related compile commands after
parsing the command line args.
Fixes https://github.com/clangd/clangd/issues/248
Reviewers: sammccall
Subscribers: mgorny, ilya-biryukov, MaskRay, jkorous, arphaman, usaxena95, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D79669
Operating systems are best effort by default, so we cannot assume that
sleep-like APIs return as soon as we'd like.
Even if a sleep-like API returns when we want it to, the potential for
preemption means that attempts to measure time are subject to delays.
Revert "clang-tidy doc: add a note for checkers with an autofix"
This reverts commit dc0f79ea5b.
Revert "add_new_check.py: Update of the template to add an autofix section"
This reverts commit f97f92e5b0.
Summary:
Currently, when looking at a checker documentation, we have to go back
to the whole list or look at the sources to figure out if an autofix
is available or not.
Reviewers: alexfh, aaron.ballman
Subscribers: wuzish, Eugene.Zelenko, nemanjai, kbarton, arphaman, Charusso, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D77983
Summary: This was preventing MemorySanitizerLegacyPass from appearing in --print-after-all.
Reviewers: vitalybuka
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D79661
Summary:
This allows us to link against stripped dylibs. Moreover, it's simply
more correct: The symbol table includes symbols that the dylib uses but
doesn't export.
This temporarily regresses our ability to do lazy symbol binding because
dyld_stub_binder isn't in libSystem's export trie. Rather, it is in one
of the sub-libraries libSystem re-exports. (This doesn't affect our
tests since we are mocking out dyld_stub_binder there.) A follow-up diff
will address this by adding support for sub-libraries.
Depends on D79114.
Reviewers: ruiu, pcc, MaskRay, smeenai, alexshap, gkm, Ktwu, christylee
Subscribers: mgorny, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D79226
Summary:
Otherwise we get undefined symbol errors depending on the order of
arguments on the command line.
Depends on D78270.
Reviewers: ruiu, pcc, MaskRay, smeenai, alexshap, gkm, Ktwu, christylee
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D79114
Summary:
This diff implements lazy symbol binding -- very similar to the PLT
mechanism in ELF.
ELF's .plt section is broken up into two sections in Mach-O:
StubsSection and StubHelperSection. Calls to functions in dylibs will
end up calling into StubsSection, which contains indirect jumps to
addresses stored in the LazyPointerSection (the counterpart to ELF's
.plt.got).
Initially, the LazyPointerSection contains addresses that point into one
of the entry points in the middle of the StubHelperSection. The code in
StubHelperSection will push on the stack an offset into the
LazyBindingSection. The push is followed by a jump to the beginning of
the StubHelperSection (similar to PLT0), which then calls into
dyld_stub_binder. dyld_stub_binder is a non-lazily bound symbol, so this
call looks it up in the GOT.
The stub binder will look up the bind opcodes in the LazyBindingSection
at the given offset. The bind opcodes will tell the binder to update the
address in the LazyPointerSection to point to the symbol, so that
subsequent calls don't have to redo the symbol resolution. The binder
will then jump to the resolved symbol.
Depends on D78269.
Reviewers: ruiu, pcc, MaskRay, smeenai, alexshap, gkm, Ktwu, christylee
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78270
Summary:
1. Don't have isHidden() depend on isNeeded(). Whether a section is
hidden is orthogonal from whether it is needed: hidden sections will
never have a header regardless of whether they have a body. (I know we
override this method with return false for synthetic sections, but
regardless I think it's confusing to write it this way for non-synthetic
sections.)
2. Don't call writeTo() on unneeded sections. D78270 assumes that this
is true when implementing the stub helper section.
3. Filter out the unneeded sections early on to avoid having to deal
with them in multiple places.
4. Remove assumption in test that the referenced file has no other symbols.
(We should create separate input files for future tests to avoid such
issues.)
Reviewers: ruiu, pcc, MaskRay, smeenai, alexshap, gkm, Ktwu, christylee
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D79460
https://reviews.llvm.org/D63616 added `-fsanitize-coverage-whitelist`
and `-fsanitize-coverage-blacklist` for clang.
However, it was done only for legacy pass manager.
This patch enable it for new pass manager as well.
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D79653
We already have matching for extend+mul+shift+trunc. But we could
also match up to the shift without the truncate and just extend the
result. That would still be a savings.
I don't have any test cases since X86 doesn't return any tied
operands from getUndefRegClearance today. But conceivably we could
want BreakFalseDeps to insert a dependency breaking XOR for
a tied operand in the future.
XOP targets have fast per-element vector shifts and we're better off splitting to 128-bit shifts where necessary (which is what we already do in LowerShift).
Currently all Fuchsia ABIs use a 4k page size, departing from
the recommended page sizes in the respective psABI documents.
Differential Revision: https://reviews.llvm.org/D79667
The compact format is fully supported on Fuchsia and is the
preferred default.
Patch By: mcgrathr
Differential Revision: https://reviews.llvm.org/D79665
Tyker