When there are both strong and weak references to an undefined
symbol ensure that the strong reference prevails in the output symbol
generating the correct error.
Test case copied from lld/test/ELF/weak-and-strong-undef.s
Differential Revision: https://reviews.llvm.org/D75322
This aims to fix a missed inlining case.
If there's a virtual call in the callee on an alloca (stack allocated object) in
the caller, and the callee is inlined into the caller, the post-inline cleanup
would devirtualize the virtual call, but if the next iteration of
DevirtSCCRepeatedPass doesn't happen (under the new pass manager), which is
based on a heuristic to determine whether to reiterate, we may miss inlining the
devirtualized call.
This enables inlining in clang/test/CodeGenCXX/member-function-pointer-calls.cpp.
This is a second commit after a revert
https://reviews.llvm.org/rG4569b3a86f8a4b1b8ad28fe2321f936f9d7ffd43 and a fix
https://reviews.llvm.org/rG41e06ae7ba91.
Differential Revision: https://reviews.llvm.org/D69591
Summary: This fixes the crash that led to the revert of D69591.
Reviewers: davidxl
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D75307
This patch deletes some dead code out of SLP vectorizer.
Couple of changes taken out of D57059 to slightly lighten it
plus one more similar case fixed.
Differential Revision: https://reviews.llvm.org/D75276
Summary:
There exists no corresponding code change for this commit, and this
commit causes downstream breakages.
This reverts commit 2db5547c01.
Reviewers: samparker
Subscribers: kristof.beyls, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D75358
Summary:
Final patch in series to fix inlining between functions with different
nobuiltin attributes/options, which was specifically an issue in LTO.
See discussion on D61634 for background.
The prior patch in this series (D67923) enabled per-Function TLI
construction that identified the nobuiltin attributes.
Here I have allowed inlining to proceed if the callee's nobuiltins are a
subset of the caller's nobuiltins, but not in the reverse case, which
should be conservatively correct. This is controlled by a new option,
-inline-caller-superset-nobuiltin, which is enabled by default.
Reviewers: hfinkel, gchatelet, chandlerc, davidxl
Subscribers: arsenm, jvesely, nhaehnle, mehdi_amini, eraman, hiraditya, haicheng, dexonsmith, kerbowa, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D74162
We can only report the knownbits for a SCALAR_TO_VECTOR node if we only demand the 0'th element - the upper elements are undefined and shouldn't be trusted.
This is causing a number of regressions that need addressing but we need to get the bugfix in first.
In some cases when HexagonTargetLowering::allowsMemoryAccess returned
true, it did not set the "Fast" argument, leaving it uninitialized.
[Hexagon] Improve casting of boolean HVX vectors to scalars
- Mark memory access for bool vectors as disallowed in target lowering.
This will prevent combining bitcasts of bool vectors with stores.
- Replace the actual bitcasting code with a faster version.
- Handle casting of v16i1 to i16.
This addes extra patterns for the VMLAS MVE instruction, which performs
Qda = Qda * Qn + Rm, a similar pattern to the existing VMLA. The sinking
of splat(Rm) into the loop is already performed, meaning we just need
extra Pat's in tablegen.
Differential Revision: https://reviews.llvm.org/D75115
Summary:
Motivated by [[ https://bugs.llvm.org/show_bug.cgi?id=45045 | Tune inspections to a specific C++ standard. ]]
Moves the isLanguageVersionSupported virtual function from `MakeSmartPtrCheck` to the base `ClangTidyCheck` class.
This will disable registering matchers or pp callbacks on unsupported language versions for a check.
Having it as a standalone function is cleaner than manually disabling the check in the register function and should hopefully
encourage check developers to actually restrict the check based on language version.
As an added bonus this could enable automatic detection of what language version a check runs on for the purpose of documentation generation
Reviewers: aaron.ballman, gribozavr2, Eugene.Zelenko, JonasToth, alexfh, hokein
Reviewed By: gribozavr2
Subscribers: xazax.hun, jkorous, arphaman, kadircet, usaxena95, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D75289
When running under LTO, it is common to not specify the architecture
spec, which is used for setting up the target machine, and instead rely
on features specified in each function to generate the correct
instructions.
This works for the code generator, but the RISC-V backend uses the
AsmPrinter to do instruction compression, which does not see these
features but instead uses a MCSubtargetInfo object to see whether
compression is enabled. Since this is configured based on the
TargetMachine at startup, it will result in compressed instructions not
being emitted when it has not been given the 'c' TargetFeature, but the
function has it.
This changes the RISCVAsmPrinter to re-initialize the STI feature set
based on the current MachineFunction, such that compressed instructions
are now correctly emitted regardless of the method used to enable them.
Differential revision: https://reviews.llvm.org/D73339
Way back in D24994, the combination of LexicalScopes::dominates and
LiveDebugValues was identified as having worst-case quadratic complexity,
but it wasn't triggered by any code path at the time. I've since run into a
scenario where this occurs, in a very large basic block where large numbers
of inlined DBG_VALUEs are present.
The quadratic-ness comes from LiveDebugValues::join calling "dominates" on
every variable location, and LexicalScopes::dominates potentially touching
every instruction in a block to test for the presence of a scope. We have,
however, already computed the presence of scopes in blocks, in the
"InstrRanges" of each scope. This patch switches the dominates method to
examine whether a block is present in a scope's InsnRanges, avoiding
walking through the whole block.
At the same time, fix getMachineBasicBlocks to account for the fact that
InsnRanges can cover multiple blocks, and add some unit tests, as Lexical
Scopes didn't have any.
Differential revision: https://reviews.llvm.org/D73725
Summary:
This patch makes EarlyCSE fold equivalent freeze instructions.
Another optimization that I think will be useful is to remove freeze if its operand is used as a branch condition or at llvm.assume:
```
%c = ...
br i1 %c, label %A, ..
A:
%d = freeze %c ; %d can be optimized to %c because %c cannot be poison or undef (or 'br %c' would be UB otherwise)
```
If it make sense for EarlyCSE to support this as well, I will make a patch for this.
Reviewers: spatel, reames, lebedev.ri
Reviewed By: lebedev.ri
Subscribers: lebedev.ri, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D75334
MC will now output the R_ARM_THM_PC8, R_ARM_THM_PC12 and
R_ARM_THM_PREL_11_0 relocations. These are short-ranged relocations that
are used to implement the adr rd, literal and ldr rd, literal pseudo
instructions.
The instructions use a new RelExpr called R_ARM_PCA in order to calculate
the required S + A - Pa expression, where Pa is AlignDown(P, 4) as the
instructions add their immediate to AlignDown(PC, 4). We also do not want
these relocations to generate or resolve against a PLT entry as the range
of these relocations is so short they would never reach.
The R_ARM_THM_PC8 has a special encoding convention for the relocation
addend, the immediate field is unsigned, yet the addend must be -4 to
account for the Thumb PC bias. The ABI (not the architecture) uses the
convention that the 8-byte immediate of 0xff represents -4.
Differential Revision: https://reviews.llvm.org/D75042
Add ELF relocations for the following fixups:
fixup_thumb_adr_pcrel_10 -> R_ARM_THM_PC8
fixup_thumb_cp -> R_ARM_THM_PC8
fixup_t2_adr_pcrel_12 -> R_ARM_THM_PREL_11_0
fixup_t2_ldst_pcrel_12 -> R_ARM_THM_PC12
While these relocations are short-ranged there is support in the open
source ELF linker's in binutils and soon to be in LLD. MC will no longer
resolve pc-relative fixups to global symbols due to interpositioning
concerns. We can handle these at link time by implementing the relocations.
The R_ARM_THM_PC8 has some extra encoding rules for addends that llvm-mc
sidesteps by not supporting addends for these instructions, using the wide
Thumb 2 instruction if it is available. I think that this is a reasonable
compromise given that these are rare.
This partiall reverts D72892, the Thumb fixups no longer need to be
evaluated at assembly time.
Differential Revision: https://reviews.llvm.org/D75039
Summary:
The point of this is to make some tests with manual checks robust
against scheduler tweaks, so that only autogenerated test updates will
be required when pushing D68338 "[AMDGPU] Remove dubious logic in
bidirectional list scheduler".
Reviewers: arsenm, rampitec, vpykhtin
Subscribers: kzhuravl, jvesely, wdng, nhaehnle, yaxunl, dstuttard, tpr, t-tye, kerbowa, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D75302
Ensure that we're recording implicit defs, as well as visiting implicit
uses and implicit defs when we're walking through operands.
Differential Revision: https://reviews.llvm.org/D75185
Summary:
Do not confuse C# nullable types with conditional expressions.
Do not put a space before the `?` in `[access-modifier] Type? variableName;`
Reviewers: krasimir, MyDeveloperDay
Reviewed By: krasimir, MyDeveloperDay
Subscribers: cfe-commits, MyDeveloperDay
Tags: #clang-format, #clang
Differential Revision: https://reviews.llvm.org/D75261
Support the explicit wide assembler qualifier for the dmb/dsb/isb synchronization barrier instructions.
Differential revision: https://reviews.llvm.org/D75143
Summary:
DWARFContext has all the required information to access source debug info.
It is not necessary to use "const object::ObjectFile" to create DWARFContext.
Thus this patch removes all usages of "const object::ObjectFile"
from DWARFLinker. Instead, already created DWARFContext is passed
to DWARFLinker. The purpose is to not depend on "const object::ObjectFile".
The patch looks big, but most of changes are renamings and movements.
Testing: it passes "check-all" lit testing. MD5 checksum for clang .dSYM bundle
matches for the dsymutil with/without that patch.
Reviewers: JDevlieghere, friss, dblaikie, aprantl
Reviewed By: JDevlieghere
Subscribers: hiraditya, llvm-commits
Tags: #llvm, #debug-info
Differential Revision: https://reviews.llvm.org/D75029
SROA will drop the explicit alignment on allocas when the ABI guarantees
enough alignment. Because the alignment on new load/store instructions
are set based on the alloca's alignment, that means SROA would end up
dropping the alignment from atomic loads and stores, which is not
allowed (see bug). For those, make sure to always carry over the
alignment from the previous instruction.
Differential revision: https://reviews.llvm.org/D75266
According to Joseph Myers, a libm maintainer
> They were only ever an ABI (selected by use of -ffinite-math-only or
> options implying it, which resulted in the headers using "asm" to redirect
> calls to some libm functions), not an API. The change means that ABI has
> turned into compat symbols (only available for existing binaries, not for
> anything newly linked, not included in static libm at all, not included in
> shared libm for future glibc ports such as RV32), so, yes, in any case
> where tools generate direct calls to those functions (rather than just
> following the "asm" annotations on function declarations in the headers),
> they need to stop doing so.
As a consequence, we should no longer assume these symbols are available on the
target system.
Still keep the TargetLibraryInfo for constant folding.
Differential Revision: https://reviews.llvm.org/D74712
llvm-ar is using CompareStringOrdinal which is available
only starting with Windows Vista (WINVER 0x600).
Fix this by hoising WindowsSupport.h, which sets _WIN32_WINNT
to 0x0601, up to llvm/include/llvm/Support and use it in llvm-ar.
Patch by Cristian Adam!
Differential revision: https://reviews.llvm.org/D74599
Summary:
It is not enough to clone the attributes at import.
They can contain reference to objects that should be imported.
This work is done now for AlignedAttr.
Reviewers: martong, a.sidorin, shafik
Reviewed By: shafik
Subscribers: rnkovacs, dkrupp, Szelethus, gamesh411, teemperor, martong, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D75048
Craig Topper