platform/upstream/llvm.git
2 years agoTrack transition from launch dyld to shared-cache dyld
Jason Molenda [Tue, 7 Jun 2022 20:27:16 +0000 (13:27 -0700)]
Track transition from launch dyld to shared-cache dyld

On macOS, a process will be launched with /usr/lib/dyld (the
dynamic linker) and the main binary by the kernel.  The
first thing the standalone dyld will do is call into the dyld
in the shared cache image.  This patch tracks the transition
between the dyld's at the very beginning of process startup.

In DynamicLoaderMacOS::NotifyBreakpointHit() there are two new
cases handled:

`dyld_image_dyld_moved` which is the launch /usr/lib/dyld indicating
that it is about call into the shared cache dyld ane evict itself.
lldb will remove the notification breakpoint it set, clear the binary
image list entirely, get the notification function pointer value out
of the dyld_all_image_infos struct (which is the notification fptr
in the to-be-run shared-cache dyld) and put an address breakpoint
there.

`dyld_notify_adding` is then called by shared-cache dyld, and we
detect this case by noticing that we have an empty binary image list,
normally impossibe, and treating this as if we'd just started a
process attach/launch.

Differential Revision: https://reviews.llvm.org/D127247
rdar://84222158

2 years ago[libc++] Make the Debug mode a configuration-time only option
Louis Dionne [Fri, 1 Apr 2022 20:38:30 +0000 (16:38 -0400)]
[libc++] Make the Debug mode a configuration-time only option

The debug mode has been broken pretty much ever since it was shipped
because it was possible to enable the debug mode in user code without
actually enabling it in the dylib, leading to ODR violations that
caused various kinds of failures.

This commit makes the debug mode a knob that is configured when
building the library and which can't be changed afterwards. This is
less flexible for users, however it will actually work as intended
and it will allow us, in the future, to add various kinds of checks
that do not assume the same ABI as the normal library. Furthermore,
this will make the debug mode more robust, which means that vendors
might be more tempted to support it properly, which hasn't been the
case with the current debug mode.

This patch shouldn't break any user code, except folks who are building
against a library that doesn't have the debug mode enabled and who try
to enable the debug mode in their code. Such users will get a compile-time
error explaining that this configuration isn't supported anymore.

In the future, we should further increase the granularity of the debug
mode checks so that we can cherry-pick which checks to enable, like we
do for unspecified behavior randomization.

Differential Revision: https://reviews.llvm.org/D122941

2 years ago[GuardWidening] Fix a nasty cast bug in c2eccc6
Philip Reames [Tue, 7 Jun 2022 20:27:13 +0000 (13:27 -0700)]
[GuardWidening] Fix a nasty cast bug in c2eccc6

c2eccc6 introduced a call to etHasNoUnsignedWrap which implicitly assumes that Inst is a OverflowingBinaryOperator.  This is frequently untrue, but was not caught because cast<Ty>(X) has been broken, see https://discourse.llvm.org/t/cast-x-is-broken-implications-and-proposal-to-address/63033 for context.

I considered reverting this, but since doing so re-introduces a nasty miscompile of its own, I decided to fix forward instead.

I'll note that this is a particularly nasty form of the cast<Ty>(X) issue.  Because the cast was succeeding unexpected, we were writing data to instructions which weren't OBOs.  This could result in near arbitrary data or memory corruption.  I'm a bit shocked that the sanitizers didn't find this TBH.

2 years agoRevert "[MemDep][NFCI] Remove redundant dyn_cast, replace with cast"
Philip Reames [Tue, 7 Jun 2022 20:09:48 +0000 (13:09 -0700)]
Revert "[MemDep][NFCI] Remove redundant dyn_cast, replace with cast"

This reverts commit 180d3f251d1ad5473705d3f00e6d426b5f8162e6.  This commit is simply wrong.  IsLoad is set within the same file based on modref state, not whether the instruction is a LoadInst.

This went uncaught because cast<Ty>(X) has been broken.  See https://discourse.llvm.org/t/cast-x-is-broken-implications-and-proposal-to-address/63033 for context.

2 years ago[JITLink][AArch64] Refactor isLoadStoreImm12 check out of getPageOffset12Shift.
Sunho Kim [Tue, 7 Jun 2022 19:29:12 +0000 (12:29 -0700)]
[JITLink][AArch64] Refactor isLoadStoreImm12 check out of getPageOffset12Shift.

The separate isLoadStoreImm12 predicate will be used for validating ELF/aarch64
ldst relocation types.

Reviewed By: lhames, sgraenitz

Differential Revision: https://reviews.llvm.org/D126628

2 years ago[VPlan] Handle VPInst without underlying instr in VPInterleavedAccess.
Florian Hahn [Tue, 7 Jun 2022 20:00:49 +0000 (21:00 +0100)]
[VPlan] Handle VPInst without underlying instr in VPInterleavedAccess.

This violation is hidden while `cast` is missing an isa assertion after
D123901.

2 years ago[Binary] Make the OffloadingImage type own the memory
Joseph Huber [Mon, 6 Jun 2022 17:08:01 +0000 (13:08 -0400)]
[Binary] Make the OffloadingImage type own the memory

Summary:
The OffloadingBinary uses a convenience struct to help manage the memory
that will be serialized using the binary format. This currently uses a
reference to an existing buffer, but this should own the memory instead
so it is easier to work with seeing as its only current use requires
saving the buffer anyway.

2 years ago[Binary] Align the image offset in OffloadBinary
Joseph Huber [Sat, 4 Jun 2022 20:56:45 +0000 (16:56 -0400)]
[Binary] Align the image offset in OffloadBinary

Summary:
The OffloadBinary wraps around an embedded device image, commonly an ELF
or LLVM BC file. These file formats have alignment requirements for
parsing, so if the image is stored at an un-aligned offset from the
beginning of the file we will be unable to parse the embeded image
without copying the image buffer. This patch adds alignment padding
before the binary image is appended to ensure we can parse the symbolic
file it contains in-place without copying memory.

2 years agoUpdate the C2x status page from latest working draft
Aaron Ballman [Tue, 7 Jun 2022 19:52:28 +0000 (15:52 -0400)]
Update the C2x status page from latest working draft

This adds the papers for the Jun, Sep, and Dec 2021 meetings. 2022
papers will be handled in a follow-up.

2 years agoRevert "[LLVM][Casting.h] Add trivial self-cast"
Philip Reames [Tue, 7 Jun 2022 19:23:43 +0000 (12:23 -0700)]
Revert "[LLVM][Casting.h] Add trivial self-cast"

This reverts commit 0809f63826d36c89574d6ac056ebf46a4b6f29ff.  The patch appears not to have included corresponding isa<Ty> support.

This was revealed when reintroducing the required isa<Ty> asserts in cast<Ty>.  See https://discourse.llvm.org/t/cast-x-is-broken-implications-and-proposal-to-address/63033 for context.

Here's the template instantiation error:
In file included from /home/preames/llvm-repo/llvm-project/llvm/unittests/Support/Casting.cpp:9:
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h: In instantiation of ‘static bool llvm::isa_impl<To, From, Enabler>::doit(const From&) [with To = llvm::bar*; From = llvm::bar; Enabler = void]’:
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:110:36:   required from ‘static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::bar*; From = llvm::bar]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:137:41:   required from ‘static bool llvm::isa_impl_wrap<To, FromTy, FromTy>::doit(const FromTy&) [with To = llvm::bar*; FromTy = const llvm::bar*]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:129:13:   required from ‘static bool llvm::isa_impl_wrap<To, From, SimpleFrom>::doit(const From&) [with To = llvm::bar*; From = const llvm::bar* const; SimpleFrom = const llvm::bar*]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:263:62:   required from ‘static bool llvm::CastIsPossible<To, From, Enable>::isPossible(const From&) [with To = llvm::bar*; From = const llvm::bar*; Enable = void]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:517:38:   required from ‘static bool llvm::CastInfo<To, From, typename std::enable_if<(! llvm::is_simple_type<From>::value), void>::type>::isPossible(From&) [with To = llvm::bar*; From = llvm::bar* const]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:556:46:   required from ‘bool llvm::isa(const From&) [with To = llvm::bar*; From = llvm::bar*]’
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:585:3:   required from ‘decltype(auto) llvm::cast(From*) [with To = llvm::bar*; From = llvm::bar]’
/home/preames/llvm-repo/llvm-project/llvm/unittests/Support/Casting.cpp:181:27:   required from here
/home/preames/llvm-repo/llvm-project/llvm/include/llvm/Support/Casting.h:64:64: error: ‘classof’ is not a member of ‘llvm::bar*’
   64 |   static inline bool doit(const From &Val) { return To::classof(&Val); }

2 years ago[InstCombine] Fold memchr of sequences of same characters
Martin Sebor [Tue, 7 Jun 2022 19:45:10 +0000 (13:45 -0600)]
[InstCombine] Fold memchr of sequences of same characters

Enhance memchr libcall folder to handle constant arrays consisting
of one or two sequences of cosecutive equal characters.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D126515

2 years ago[InstCombine] Add substr helper function (NFC).
Martin Sebor [Tue, 7 Jun 2022 18:54:31 +0000 (12:54 -0600)]
[InstCombine] Add substr helper function (NFC).

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D126515

2 years ago[clang][dataflow][NFC] Fix filename typos in tests
Sam Estep [Tue, 7 Jun 2022 19:17:00 +0000 (19:17 +0000)]
[clang][dataflow][NFC] Fix filename typos in tests

Reviewed By: ymandel

Differential Revision: https://reviews.llvm.org/D127008

2 years agoReland [AMDGPU] gfx11 vop3dpp instructions
Joe Nash [Wed, 18 May 2022 19:01:20 +0000 (15:01 -0400)]
Reland [AMDGPU] gfx11 vop3dpp instructions

There was an issue with encoding wide (>64 bit) instructions on
BigEndian hosts, which is fixed in D127195. Therefore reland this.

gfx11 adds the ability to use dpp modifiers on vop3 instructions.
This patch adds machine code layer support for that. The MCCodeEmitter
is changed to use APInt instead of uint64_t to support these wider
instructions.

Patch 16/N for upstreaming of AMDGPU gfx11 architecture

Differential Revision: https://reviews.llvm.org/D126483

2 years ago[WebAssembly] Add WASM_SEC_LAST_KNOWN to BinaryFormat section types list [NFC]
Derek Schuff [Mon, 6 Jun 2022 22:42:24 +0000 (15:42 -0700)]
[WebAssembly] Add WASM_SEC_LAST_KNOWN to BinaryFormat section types list [NFC]

There are 3 places where we were using WASM_SEC_TAG as the "last" known
section type, which requires updating (or leaves a bug) when a new known
section type is added. Instead add a "last type" to the enum for this
purpose.

Differential Revision: https://reviews.llvm.org/D127164

2 years ago[JITLink][ELF][AArch64] Lift MachO/arm64 edges into aarch64.h, reuse for ELF.
Sunho Kim [Tue, 7 Jun 2022 18:39:05 +0000 (11:39 -0700)]
[JITLink][ELF][AArch64] Lift MachO/arm64 edges into aarch64.h, reuse for ELF.

This patch moves the aarch64 fixup logic from the MachO/arm64 backend to
aarch64.h header so that it can be re-used in the ELF/aarch64 backend. This
significantly expands relocation support in the ELF/aarch64 backend.

Reviewed By: lhames, sgraenitz

Differential Revision: https://reviews.llvm.org/D126286

2 years ago[ValueTracking] Add support to deduce a PHI node being a power of 2 if each incoming...
William Huang [Tue, 7 Jun 2022 18:48:24 +0000 (18:48 +0000)]
[ValueTracking] Add support to deduce a PHI node being a power of 2 if each incoming value is a power of 2.

Reviewed By: davidxl

Differential Revision: https://reviews.llvm.org/D124889

2 years ago[config] Remove vestigial LLVM_VERSION_INFO
Reid Kleckner [Fri, 3 Jun 2022 17:27:02 +0000 (10:27 -0700)]
[config] Remove vestigial LLVM_VERSION_INFO

This has been superseded by the llvm/Support/VCSRevision.h header. So
far as I can tell, nothing in the CMake build sets LLVM_VERSION_INFO. It
was always undefined, and the ifdefs using it were dead. However, CMake
is very flexible, so it's possible that I missed some ways to set this
variable. One could, for example, probably pass -DLLVM_VERSION_INFO=x on
the command line and get that through to configure_file, or set the
variable in an obscure way (`set(${proj}_VERSION_INFO "x")`). I'm
reasonably confident that isn't happening, but I'd like a second
opinion.

Update the Bazel and gn builds accordingly.

Differential Revision: https://reviews.llvm.org/D126977

2 years ago[config] Remove RETSIGTYPE from config.h.cmake, NFC
Reid Kleckner [Fri, 3 Jun 2022 23:21:42 +0000 (16:21 -0700)]
[config] Remove RETSIGTYPE from config.h.cmake, NFC

This doesn't need to be configurable. It was hardcoded to void in all
LLVM build systems.

2 years ago[CodeGen] Fix an issue when the 'extern C' replacement names broke
Erich Keane [Tue, 7 Jun 2022 18:29:03 +0000 (11:29 -0700)]
[CodeGen] Fix an issue when the 'extern C' replacement names broke

Originally broken by me in D122608, this is a regression where we
attempt to replace an extern-C thing with 'itself'.  The problem is that
we end up deleting it, causing the value to fail when it gets put into
llvm.used.

2 years ago[PointerUnionTest] Fix an incorrectly written test
Philip Reames [Tue, 7 Jun 2022 14:43:00 +0000 (07:43 -0700)]
[PointerUnionTest] Fix an incorrectly written test

The test being change appears to have been intended to exercise PointerUnion, but what it actually did was cast<> a double to a double*.  This only worked because cast<> was missing the required assertion.  Adding the assertion reveals a template error where isa<const double*>(double) fails to compile.

2 years ago[clang-diff] Fix assertion error when dealing with wide strings
Kaining Zhong [Tue, 7 Jun 2022 17:39:46 +0000 (19:39 +0200)]
[clang-diff] Fix assertion error when dealing with wide strings

Directly using StringLiteral::getString for wide string is not
currently supported; therefore in ASTDiff, getStmtValue will fail when
asserting that the StringLiteral has a width of 1. This patch also
covers cases for UTF16 and UTF32 encoding, along with corresponding
test cases.

Fixes https://github.com/llvm/llvm-project/issues/55771.

Reviewed By: johannes

Differential Revision: https://reviews.llvm.org/D126651

2 years ago[CodeEmitter] Fix encoding wide instructions on big-endian hosts
Jay Foad [Tue, 7 Jun 2022 09:41:50 +0000 (10:41 +0100)]
[CodeEmitter] Fix encoding wide instructions on big-endian hosts

For instructions wider than 64 bits the InstBits table is initialized in
64-bit chunks from APInt::getRawData, but it was being read with
LoadIntFromMemory which is byte-based.

Fix this by reading the table with the APInt constructor that takes an
ArrayRef to the raw data instead.

This is currently NFC for in-tree targets but fixes AMDGPU failures on
big-endian hosts that were caused by D126483 until it was reverted.

Differential Revision: https://reviews.llvm.org/D127195

2 years ago[AArch64] Remove isDef32
David Green [Tue, 7 Jun 2022 17:57:59 +0000 (18:57 +0100)]
[AArch64] Remove isDef32

isDef32 would attempt to make a guess at which SelectionDag nodes were
32bit sources, and use the nature of 32bit AArch64 instructions
implicitly zeroing the upper register half to not emit zext that were
expected to already be zero. This was a bit fragile though, needing to
guess at the correct opcodes that do not become 32bit defs later in
ISel.

This patch removed isDef32, relying on the AArch64MIPeephole optimizer
to remove redundant SUBREG_TO_REG nodes. A part of
SelectArithExtendedRegister was left with the same logic as a heuristic
to prevent some regressions from it picking less optimal sequences.
The AArch64MIPeepholeOpt pass also needs to be taught that a COPY from a
FPR will become a FMOVSWr, which it lowers immediately to make sure that
remains true through register allocation.

Fixes #55833

Differential Revision: https://reviews.llvm.org/D127154

2 years ago[analyzer] Fix null pointer deref in CastValueChecker
Vince Bridgers [Mon, 6 Jun 2022 12:23:08 +0000 (08:23 -0400)]
[analyzer] Fix null pointer deref in CastValueChecker

A crash was seen in CastValueChecker due to a null pointer dereference.

The fix uses QualType::getAsString to avoid the null dereference
when a CXXRecordDecl cannot be obtained. A small reproducer is added,
and cast value notes LITs are updated for the new debug messages.

Reviewed By: steakhal

Differential Revision: https://reviews.llvm.org/D127105

2 years ago[InstCombine] reduce right-shift-of-left-shifted constant via demanded bits
Sanjay Patel [Tue, 7 Jun 2022 16:42:12 +0000 (12:42 -0400)]
[InstCombine] reduce right-shift-of-left-shifted constant via demanded bits

If we don't demand high bits (zeros) and it is valid to pre-shift a constant:
(C2 << X) >> C1 --> (C2 >> C1) << X

https://alive2.llvm.org/ce/z/P3dWDW

There are a variety of related patterns, but I haven't found a single solution
that gets all of the motivating examples - so pulling this piece out of
D126617 along with more tests.

We should also handle the case where we shift-right followed by shift-left,
but I'll make that a follow-on patch assuming this one is ok. It seems likely
that we would want to add this to the SDAG version of the code too to keep it
on par with IR.

Differential Revision: https://reviews.llvm.org/D127122

2 years ago[InstCombine] add vector tests for shift-shift; NFC
Sanjay Patel [Tue, 7 Jun 2022 12:54:38 +0000 (08:54 -0400)]
[InstCombine] add vector tests for shift-shift; NFC

D127122

2 years ago[MLIR][Presburger] Fix subtract processing extra inequalities
Groverkss [Tue, 7 Jun 2022 17:19:34 +0000 (22:49 +0530)]
[MLIR][Presburger] Fix subtract processing extra inequalities

This patch fixes a bug in PresburgeRelation::subtract that made it process the
inequality at index 0, multiple times. This was caused by allocating memory
instead of reserving memory in llvm::SmallVector.

Reviewed By: arjunp

Differential Revision: https://reviews.llvm.org/D127228

2 years ago[llvm-ml] Remove all file extension restrictions
Alan Zhao [Thu, 2 Jun 2022 23:42:37 +0000 (19:42 -0400)]
[llvm-ml] Remove all file extension restrictions

After D126425 was submitted, hans@ observed that MSVC's ml.exe doesn't
care about the file's extension at all. Now, we check if the file exists
to determine whether an input filename is a valid assembly file.

To keep things consistent with clang-cl and lld-link, llvm-ml will treat
everything that's not a flag as a filename.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D126931

2 years ago[libc++] Removes _LIBCPP_AVAILABILITY_TO_CHARS.
Mark de Wever [Tue, 31 May 2022 16:58:54 +0000 (18:58 +0200)]
[libc++] Removes _LIBCPP_AVAILABILITY_TO_CHARS.

After moving the std::to_chars base 10 implementation from the dylib to
the header the integral overloads of std::to_chars are available on all
platforms.

Remove the _LIBCPP_AVAILABILITY_TO_CHARS availability macro and update
the tests.

Depends on D125704

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D125745

2 years agoAdd initial coverage for invalid instruction costs in LoopRotate
Philip Reames [Tue, 7 Jun 2022 16:54:23 +0000 (09:54 -0700)]
Add initial coverage for invalid instruction costs in LoopRotate

Once extended with a case which requires duplication, will serve as test for crash being fixed in D127131.

2 years ago[libc++][CI] Updates Docker image.
Mark de Wever [Mon, 30 May 2022 16:34:15 +0000 (18:34 +0200)]
[libc++][CI] Updates Docker image.

- Updates the image to use Ubuntu Jammy.
- Installs GCC-12 as preparation to migrate to that GCC version.

Reviewed By: ldionne, #libc, jloser

Differential Revision: https://reviews.llvm.org/D126666

2 years ago[libc++] Don't use static constexpr in headers.
Mark de Wever [Thu, 2 Jun 2022 06:16:40 +0000 (08:16 +0200)]
[libc++] Don't use static constexpr in headers.

This was noticed in the review of D125704. In that commit only the new
table has been adapted. This adapts the existing tables.

Note since libc++'s charconv is backported to C++11 it's not possible to
use inline constexpr variables. The were introduced in C++17.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D126887

2 years ago[NFC] Fix spelling/newlines in comments/debug messages
David Penry [Tue, 29 Mar 2022 17:13:55 +0000 (10:13 -0700)]
[NFC] Fix spelling/newlines in comments/debug messages

Just a few spelling mistakes and missing newlines

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D127162

2 years ago[format] Fix an uninitialized variable
Benjamin Kramer [Tue, 7 Jun 2022 16:17:40 +0000 (18:17 +0200)]
[format] Fix an uninitialized variable

parseBlock may decide to leave it unchanged. Found by msan.

2 years ago[Libomptarget] Do not use retaining attributes for the static library
Joseph Huber [Tue, 31 May 2022 14:08:25 +0000 (10:08 -0400)]
[Libomptarget] Do not use retaining attributes for the static library

When we build the libomptarget device runtime library targeting bitcode,
we need special care to make sure that certain functions are not
optimized out. This is because we manually internalize and optimize
these definitions, ignoring their standard linkage semantics. When we
build with the static library, we can maintain these semantics and we do
not need these to be kept-alive. Furthermore, if they are kept-alive it
prevents them from being removed during LTO. This prevents us from
completely internalizing `IsSPMDMode` and removing several other
functions. This patch removes these for the static library target by
using a macro definition to enable them.

Reviewed By: JonChesterfield

Differential Revision: https://reviews.llvm.org/D126701

2 years ago[DAG] combineShuffleOfSplatVal - fold shuffle(splat,undef) -> splat, iff the splat...
Simon Pilgrim [Tue, 7 Jun 2022 15:42:15 +0000 (16:42 +0100)]
[DAG] combineShuffleOfSplatVal - fold shuffle(splat,undef) -> splat, iff the splat contains no UNDEF elements

As noticed on D127115 - we were missing this fold, instead just having the shuffle(shuffle(x,undef,splatmask),undef) fold. We should be able to merge these into one using SelectionDAG::isSplatValue, but we'll need to match the shuffle's undef handling first.

This also exposed an issue in SelectionDAG::isSplatValue which was incorrectly propagating the undef mask across a bitcast (it was trying to just bail with a APInt::isSubsetOf if it found any undefs but that was actually the wrong way around so didn't fire for partial undef cases).

2 years ago[LLDB] Remove decorator from XPASSes AArch64/Windows
Muhammad Omair Javaid [Tue, 7 Jun 2022 15:30:24 +0000 (19:30 +0400)]
[LLDB] Remove decorator from XPASSes AArch64/Windows

This patch remove XFAIL decorator from tests which as passing on AArch64
Windows. This is tested on surface pro x using tot llvm and clang 14.0.3
as compiler with visual studio 2019 x86_arm64 environment.

2 years ago[LLDB] Fix TestBase.generateSource for AArch64/Windows
Muhammad Omair Javaid [Tue, 7 Jun 2022 13:47:50 +0000 (17:47 +0400)]
[LLDB] Fix TestBase.generateSource for AArch64/Windows

This patch adds a minor fix in lldbtest.py TestBase.generateSource
function. Generated Python source with directory paths was not being
escaped properly. This fix makes sure we treat dir path as raw string.

2 years ago[LoopFlatten] Fix crash if the inner loop trip count comes from a sext instruction.
Craig Topper [Tue, 7 Jun 2022 15:21:20 +0000 (08:21 -0700)]
[LoopFlatten] Fix crash if the inner loop trip count comes from a sext instruction.

If we look through a truncate in matchLinearIVUser, it's possible
we find a sext/zext instruction that didn't come from widening.
This will fail the MatchedItCount->getType() == InnerInductionPHI->getType()
assertion.

Fix this by checking that we did not look through a truncate already.

Reviewed By: SjoerdMeijer

Differential Revision: https://reviews.llvm.org/D127149

2 years ago[LoopFlatten] Replace unchecked dyn_cast with cast.
Craig Topper [Tue, 7 Jun 2022 15:20:59 +0000 (08:20 -0700)]
[LoopFlatten] Replace unchecked dyn_cast with cast.

Spotted while reading through the code.

Reviewed By: SjoerdMeijer

Differential Revision: https://reviews.llvm.org/D127146

2 years ago[RISCV] Scalarize gather/scatter on RV64 with Zve32* extension.
Craig Topper [Tue, 7 Jun 2022 15:07:49 +0000 (08:07 -0700)]
[RISCV] Scalarize gather/scatter on RV64 with Zve32* extension.

i64 indices aren't supported on Zve32*. Scalarize gathers to prevent
generating illegal instructions.

Since InstCombine will aggressively canonicalize GEP indices to
pointer size, we're pretty much always going to have an i64 index.

Trying to predict when SelectionDAG will find a smaller index from
the TTI hook used by the ScalarizeMaskedMemIntrinPass seems fragile.
To optimize this we probably need an IR pass to rewrite it earlier.

Test RUN lines have also been added to make sure the strided load/store
optimization still works.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D127179

2 years ago[SLP]Add a test for geps with non-const indeces in scatter vectorize
Alexey Bataev [Tue, 7 Jun 2022 15:02:14 +0000 (08:02 -0700)]
[SLP]Add a test for geps with non-const indeces in scatter vectorize
nodes, NFC.

2 years ago[gn build] Port 47c8ec811f78
LLVM GN Syncbot [Tue, 7 Jun 2022 14:38:58 +0000 (14:38 +0000)]
[gn build] Port 47c8ec811f78

2 years ago[clang][AArch64][SVE] Improve diagnostics for SVE operators
David Truby [Mon, 6 Jun 2022 11:15:38 +0000 (12:15 +0100)]
[clang][AArch64][SVE] Improve diagnostics for SVE operators

This patch corrects some diagnostics for the SVE sizeless vector
operators, including correctly diagnosing when the vectors are
different sizes.

Differential Revision: https://reviews.llvm.org/D126377

2 years ago[DX][ObjYAML] Zero out unused fields that get written to the output file
Benjamin Kramer [Tue, 7 Jun 2022 14:29:06 +0000 (16:29 +0200)]
[DX][ObjYAML] Zero out unused fields that get written to the output file

Found by msan

2 years agollvm-reduce: Add -abort-on-invalid-reduction to MIR tests
Matt Arsenault [Mon, 6 Jun 2022 13:17:55 +0000 (09:17 -0400)]
llvm-reduce: Add -abort-on-invalid-reduction to MIR tests

Ideally reductions would never produce invalid IR, and we shouldn't
regress on cases that already avoid doing so.

2 years agollvm-reduce: Don't set generic instruction operands to undef
Matt Arsenault [Mon, 6 Jun 2022 13:21:02 +0000 (09:21 -0400)]
llvm-reduce: Don't set generic instruction operands to undef

The intention is that these should never have undef operands. It turns
out the restriction the verifier enforces is too lax. The verifier
enforces that registers without a register class cannot be undef, but
it's valid to use a register with a register class and type. The
verifier needs to change to be based on the opcode.

2 years agollvm-reduce: Add pass to remove register uses
Matt Arsenault [Fri, 22 Apr 2022 15:44:37 +0000 (11:44 -0400)]
llvm-reduce: Add pass to remove register uses

Try to delete implicit uses, and add undef flags to explicit ones.

2 years ago[AMDGPU] Add support for the .reloc directive
Jay Foad [Mon, 6 Jun 2022 14:51:18 +0000 (15:51 +0100)]
[AMDGPU] Add support for the .reloc directive

Differential Revision: https://reviews.llvm.org/D127117

2 years agollvm-reduce: Add cloning of target MachineFunctionInfo
Matt Arsenault [Sat, 16 Apr 2022 02:35:53 +0000 (22:35 -0400)]
llvm-reduce: Add cloning of target MachineFunctionInfo

MIR support is totally unusable for AMDGPU without this, since the set
of reserved registers is set from fields here.

Add a clone method to MachineFunctionInfo. This is a subtle variant of
the copy constructor that is required if there are any MIR constructs
that use pointers. Specifically, at minimum fields that reference
MachineBasicBlocks or the MachineFunction need to be adjusted to the
values in the new function.

2 years agoAMDGPU: Make PSV instances static members
Matt Arsenault [Mon, 18 Apr 2022 15:01:19 +0000 (11:01 -0400)]
AMDGPU: Make PSV instances static members

2 years ago[libc++] Forgot to bump the CI timeout everywhere
Louis Dionne [Tue, 7 Jun 2022 14:01:01 +0000 (10:01 -0400)]
[libc++] Forgot to bump the CI timeout everywhere

2 years ago[libc++] Bump timeout to avoid spurious failures on AIX
Louis Dionne [Tue, 7 Jun 2022 14:00:25 +0000 (10:00 -0400)]
[libc++] Bump timeout to avoid spurious failures on AIX

2 years agollvm-reduce: Fix crashes on unreachable blocks for MIR instructions
Matt Arsenault [Sat, 4 Jun 2022 22:31:18 +0000 (18:31 -0400)]
llvm-reduce: Fix crashes on unreachable blocks for MIR instructions

2 years agollvm-reduce: Don't assert on functions which don't track liveness
Matt Arsenault [Wed, 13 Apr 2022 21:26:42 +0000 (17:26 -0400)]
llvm-reduce: Don't assert on functions which don't track liveness

Use the query that doesn't assert if TracksLiveness isn't set, which
needs to always be available. We also need to start printing liveins
regardless of TracksLiveness.

2 years agoAMDGPU: Fix not checking liveness in test
Matt Arsenault [Mon, 6 Jun 2022 22:27:11 +0000 (18:27 -0400)]
AMDGPU: Fix not checking liveness in test

2 years ago[Alignment][NFC] Remove usage of MemSDNode::getAlignment
Guillaume Chatelet [Fri, 3 Jun 2022 16:37:45 +0000 (16:37 +0000)]
[Alignment][NFC] Remove usage of MemSDNode::getAlignment

I can't remove the function just yet as it is used in the generated .inc files.
I would also like to provide a way to compare alignment with TypeSize since it came up a few times.

Differential Revision: https://reviews.llvm.org/D126910

2 years ago[X86] getFauxShuffleMask - add VSELECT/BLENDV handling
Simon Pilgrim [Tue, 7 Jun 2022 13:27:06 +0000 (14:27 +0100)]
[X86] getFauxShuffleMask - add VSELECT/BLENDV handling

First step towards enabling shuffle combining starting from VSELECT/BLENDV nodes - this should eventually help improve the codegen reported at Issue #54819

2 years ago[X86] x86-interleaved-access.ll - use nounwind to remove cfi noise from tests
Simon Pilgrim [Tue, 7 Jun 2022 13:17:23 +0000 (14:17 +0100)]
[X86] x86-interleaved-access.ll - use nounwind to remove cfi noise from tests

2 years ago[clang-cl] Add support for /kernel
Pengxuan Zheng [Tue, 7 Jun 2022 13:42:22 +0000 (06:42 -0700)]
[clang-cl] Add support for /kernel

MSVC defines _KERNEL_MODE when /kernel is passed.
Also, /kernel disables RTTI and C++ exception handling.

https://docs.microsoft.com/en-us/cpp/build/reference/kernel-create-kernel-mode-binary?view=msvc-170

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D126719

2 years ago[ARM] Fix MVE getShuffleCost legalized type check
David Green [Tue, 7 Jun 2022 13:36:04 +0000 (14:36 +0100)]
[ARM] Fix MVE getShuffleCost legalized type check

The MVE shuffle costing for VREV instructions was making incorrect
assumptions as to legalized vector types remaining as vectors. Add a
quick check to ensure they are indeed vectors before attempting to get
the number of elements.

2 years ago[AArch64] Regenerate arm64-shifted-sext.ll and add a test from #55833. NFC
David Green [Tue, 7 Jun 2022 12:55:53 +0000 (13:55 +0100)]
[AArch64] Regenerate arm64-shifted-sext.ll and add a test from #55833. NFC

2 years ago[X86] X86SpeculativeLoadHardening.cpp - pass DebugLoc by const reference not value.
Simon Pilgrim [Tue, 7 Jun 2022 11:38:05 +0000 (12:38 +0100)]
[X86] X86SpeculativeLoadHardening.cpp - pass DebugLoc by const reference not value.

2 years ago[X86] foldMaskedMergeImpl - pass SDLoc by const reference not value.
Simon Pilgrim [Tue, 7 Jun 2022 11:36:30 +0000 (12:36 +0100)]
[X86] foldMaskedMergeImpl - pass SDLoc by const reference not value.

2 years agoFix change of variable name in test
Guillaume Chatelet [Tue, 7 Jun 2022 11:20:44 +0000 (11:20 +0000)]
Fix change of variable name in test

2 years ago[DebugInfo][Docs] Improve code formatting in instruction referencing doc
J. Ryan Stinnett [Wed, 1 Jun 2022 10:04:46 +0000 (11:04 +0100)]
[DebugInfo][Docs] Improve code formatting in instruction referencing doc

This adds code blocks and inline code formatting to improve the readability of
the instruction referencing doc.

Reviewed By: Orlando

Differential Revision: https://reviews.llvm.org/D126767

2 years ago[clang-tidy] Fix syntax error in release notes.
Martin Boehme [Tue, 7 Jun 2022 11:03:56 +0000 (13:03 +0200)]
[clang-tidy] Fix syntax error in release notes.

Introduced by
https://github.com/llvm/llvm-project/commit/1b664460fa4cb507e2af87c48cd269964f3ad747

Sorry for the breakage.

2 years ago[analyzer] Remove NotifyAssumeClients
Gabor Marton [Thu, 2 Jun 2022 13:05:45 +0000 (15:05 +0200)]
[analyzer] Remove NotifyAssumeClients

Depends on D126560.

Differential Revision: https://reviews.llvm.org/D126878

2 years ago[clang-tidy] `bugprone-use-after-move`: Don't warn on self-moves.
Martin Boehme [Tue, 7 Jun 2022 09:00:24 +0000 (11:00 +0200)]
[clang-tidy] `bugprone-use-after-move`: Don't warn on self-moves.

Reviewed By: sammccall, njames93

Differential Revision: https://reviews.llvm.org/D126853

2 years ago[analyzer][NFC] Add LLVM_UNLIKELY to assumeDualImpl
Gabor Marton [Tue, 7 Jun 2022 08:29:54 +0000 (10:29 +0200)]
[analyzer][NFC] Add LLVM_UNLIKELY to assumeDualImpl

Aligned with the measures we had in D124674, this condition seems to be
unlikely.

Nevertheless, I've made some new measurments with stats just for this,
and data confirms this is indeed unlikely.

Differential Revision: https://reviews.llvm.org/D127190

2 years ago[clang] Remove some `U+C2AD`s in `__cpp_multidimensional_subscript`
Yuki Okushi [Sun, 5 Jun 2022 03:30:50 +0000 (12:30 +0900)]
[clang] Remove some `U+C2AD`s in `__cpp_multidimensional_subscript`

The `Builder.defineMacro("__cpp_multidimensional_subscript", "202110L");` line has
some `U+C2AD`s that shouldn't necessary here. So removed them.

Differential Revision: https://reviews.llvm.org/D127066

2 years ago[NFC][InstCombine] Add two more tests to select-binop-foldable-floating-point.ll
David Sherwood [Tue, 7 Jun 2022 10:00:33 +0000 (11:00 +0100)]
[NFC][InstCombine] Add two more tests to select-binop-foldable-floating-point.ll

Pre-commit some tests as part of https://reviews.llvm.org/D126774

2 years ago[Flang] Add flag dependent code to execute the loop-body atleast once
Kiran Chandramohan [Tue, 7 Jun 2022 09:57:38 +0000 (09:57 +0000)]
[Flang] Add flag dependent code to execute the loop-body atleast once

Given the flag `--always-execute-loop-body` the compiler emits code
to execute the body of the loop atleast once.

Note: This is part of upstreaming from the fir-dev branch of
https://github.com/flang-compiler/f18-llvm-project.

Reviewed By: awarzynski, schweitz

Differential Revision: https://reviews.llvm.org/D127128

Co-authored-by: Jean Perier <jperier@nvidia.com>
Co-authored-by: Eric Schweitz <eschweitz@nvidia.com>
Co-authored-by: V Donaldson <vdonaldson@nvidia.com>
Co-authored-by: Valentin Clement <clementval@gmail.com>
Co-authored-by: Sameeran Joshi <sameeranjayant.joshi@amd.com>
2 years ago[clang-format][NFC] Clean up the unwrapped line parser
owenca [Fri, 3 Jun 2022 21:19:00 +0000 (14:19 -0700)]
[clang-format][NFC] Clean up the unwrapped line parser

Change the signatures of parseBlock(), parseLevel(), and
parseStructuralElement() to support combining else and if when
removing braces. See #55663.

Differential Revision: https://reviews.llvm.org/D127005

2 years ago[X86] LowerGC_TRANSITION - remove redundant SDLoc().
Simon Pilgrim [Tue, 7 Jun 2022 09:50:21 +0000 (10:50 +0100)]
[X86] LowerGC_TRANSITION - remove redundant SDLoc().

2 years ago[Flang,MLIR,OpenMP] Fix a few tests that were not converting to LLVM
Kiran Chandramohan [Tue, 7 Jun 2022 09:44:20 +0000 (09:44 +0000)]
[Flang,MLIR,OpenMP] Fix a few tests that were not converting to LLVM

A few OpenMP tests were retaining the FIR operands even after running
the LLVM conversion pass. To fix these tests the legality checkes for
OpenMP conversion are made stricter to include operands and results.
The Flush, Single and Sections operations are added to conversions or
legality checks. The RegionLessOpConversion is appropriately renamed
to clarify that it works only for operations with Variable operands.
The operands of the flush operation are changed to match those of
Variable Operands.

Fix for an OpenMP issue mentioned in
https://github.com/llvm/llvm-project/issues/55210.

Reviewed By: shraiysh, peixin, awarzynski

Differential Revision: https://reviews.llvm.org/D127092

2 years ago[mlir] fix documentation format in SCF
Alex Zinenko [Tue, 7 Jun 2022 09:51:24 +0000 (11:51 +0200)]
[mlir] fix documentation format in SCF

Four leading spaces are interpreted as a code block in markdown. Unless
used consistently in ODS op description, they cannot be stripped away by
the tablegen backend, which results in malformed markdown being
generated.

2 years agoCleanup sema checking for buitlin_memcpy_inline
Guillaume Chatelet [Tue, 7 Jun 2022 09:49:36 +0000 (09:49 +0000)]
Cleanup sema checking for buitlin_memcpy_inline

2 years ago[LoopVectorize] Add FastMathFlags to the select used for reductions with tail-folding
David Sherwood [Wed, 1 Jun 2022 13:01:37 +0000 (14:01 +0100)]
[LoopVectorize] Add FastMathFlags to the select used for reductions with tail-folding

Based on reviewer comments on https://reviews.llvm.org/D126692 I've
added FastMathFlags to the select instruction used when tail-folding
with reductions. These flags can then be used by InstCombine to
decide upon the most optimal floating point identity value for
fadd/fsub. Doing so unlocks further optimisations, such as folding
selects into masked loads.

Differential Revision: https://reviews.llvm.org/D126778

2 years ago[mlir][spirv] Correctly deduce PhysicalStorageBuffer64 addressing model
Alexander Batashev [Tue, 7 Jun 2022 09:13:59 +0000 (12:13 +0300)]
[mlir][spirv] Correctly deduce PhysicalStorageBuffer64 addressing model

According to the SPIR-V specification[1], PhysicalStorageBuffer storage
class can only be used iff addressing model is PhysicalStorageBuffer64.

[1]: https://www.khronos.org/registry/SPIR-V/specs/unified1/SPIRV.html#_addressing_model

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D127067

2 years ago[APInt] Remove truncOrSelf, zextOrSelf and sextOrSelf
Jay Foad [Wed, 6 Oct 2021 11:14:55 +0000 (12:14 +0100)]
[APInt] Remove truncOrSelf, zextOrSelf and sextOrSelf

Differential Revision: https://reviews.llvm.org/D125559

2 years ago[pseudo]Pull out the operator< test, NFC
Haojian Wu [Tue, 7 Jun 2022 08:51:45 +0000 (10:51 +0200)]
[pseudo]Pull out the operator< test, NFC

Fix the review comment in https://reviews.llvm.org/D125479.

2 years ago[pseudo] Fix the incorrect parameters-and-qualifiers rule.
Haojian Wu [Tue, 7 Jun 2022 08:44:30 +0000 (10:44 +0200)]
[pseudo] Fix the incorrect parameters-and-qualifiers rule.

The parenthese body should be parameter-declaration-clause, rather
than parameter-declaration-list.

Reviewed By: sammccall

Differential Revision: https://reviews.llvm.org/D125479

2 years ago[LLDB] Avoid using -fno-builtin for building API tests
Muhammad Omair Javaid [Tue, 7 Jun 2022 08:09:13 +0000 (12:09 +0400)]
[LLDB] Avoid using -fno-builtin for building API tests

This patch removes use of -fno-builtin flag for building LLDB API
tests.

LLDB API tests are built using Makefile.rules where we were using
-fno-builtin flag to avoid gcc intrinsic optimization conflicting
with Android runtime in past.

Now that we no longer use gcc for building testsuite and compiling
LLDB API tests on AArch64/Windows require clang to optimize certain
calls like _setjmp to setjmpex as former is not implemented by
AArch64 windows runtime.

2 years ago[pseudo] Fix the type-parameter rule.
Haojian Wu [Fri, 3 Jun 2022 20:01:36 +0000 (22:01 +0200)]
[pseudo] Fix the type-parameter rule.

The IDENTIFIER should be optional.

Differential Revision: https://reviews.llvm.org/D126998

2 years ago[pseudo] Handle the language predefined identifier __func__
Haojian Wu [Fri, 3 Jun 2022 19:47:11 +0000 (21:47 +0200)]
[pseudo] Handle the language predefined identifier __func__

The clang lexer lexes it as a dedicated token kind (rather than
identifier), we extend the grammar to handle it.

Differential Revision: https://reviews.llvm.org/D126996

2 years ago[MLIR][LLVMIR] Add round intrinsic
lorenzo chelini [Thu, 2 Jun 2022 13:56:01 +0000 (15:56 +0200)]
[MLIR][LLVMIR] Add round intrinsic

Reviewed By: ftynse

Differential Revision: https://reviews.llvm.org/D126879

2 years ago[pseudo] Fix noptr-abstract-declarator rule.
Haojian Wu [Fri, 3 Jun 2022 19:13:26 +0000 (21:13 +0200)]
[pseudo] Fix noptr-abstract-declarator rule.

The const-expression in the [] can be empty.

Differential Revision: https://reviews.llvm.org/D126992

2 years ago[SCCP] Don't mark ranges from branch conditions as potentially undef
Nikita Popov [Mon, 30 May 2022 13:05:04 +0000 (15:05 +0200)]
[SCCP] Don't mark ranges from branch conditions as potentially undef

Now that transforms introducing branch on poison have been removed,
we can stop marking ranges that have been derived from branch
conditions as containing undef. The existing comment explains why
this is legal. I've checked that alive2 is happy with SCCP tests
after this change.

Differential Revision: https://reviews.llvm.org/D126647

2 years ago[pseudo] Fix the member-specification grammar rule.
Haojian Wu [Fri, 3 Jun 2022 19:02:25 +0000 (21:02 +0200)]
[pseudo] Fix the member-specification grammar rule.

The grammar rule is not right, doesn't match the standard one.

Differential Revision: https://reviews.llvm.org/D126991

2 years ago[flang][docs] Remove the out-dated note on Windows support
Andrzej Warzynski [Tue, 7 Jun 2022 08:09:26 +0000 (08:09 +0000)]
[flang][docs] Remove the out-dated note on Windows support

Building Flang on Windows *is supported*. It's been tested there for
quite a while now:
  * https://lab.llvm.org/buildbot/#/builders/172

Submitting this without a review as the current note in the readme file
is clearly incorrect.

2 years ago[DAGCombiner] Remove overzealous assertion when folding assert+trunc+assert (PR55846)
Nikita Popov [Fri, 3 Jun 2022 09:11:03 +0000 (11:11 +0200)]
[DAGCombiner] Remove overzealous assertion when folding assert+trunc+assert (PR55846)

These assert that there are no "useless" assertzext/assertsext nodes
(that assert a wider width than a following trunc), but I don't think
there is anything preventing such nodes from reaching this code.
I don't think the assertion is relevant for correctness of this
transform either -- if such an assert is present, then the other
one will always be to a smaller width, and we'll pick that one.
The assertion dates back to D37017.

Fixes https://github.com/llvm/llvm-project/issues/55846.

Differential Revision: https://reviews.llvm.org/D126952

2 years ago[mlir][complex] Add complex.conj op
lewuathe [Tue, 7 Jun 2022 07:37:20 +0000 (09:37 +0200)]
[mlir][complex] Add complex.conj op

Add complex.conj op to calculate the complex conjugate which is widely used for the mathematical operation on the complex space.

Reviewed By: pifon2a

Differential Revision: https://reviews.llvm.org/D127181

2 years ago[MC] De-capitalize MCStreamer functions
Fangrui Song [Tue, 7 Jun 2022 07:31:02 +0000 (00:31 -0700)]
[MC] De-capitalize MCStreamer functions

Follow-up to c031378ce01b8485ba0ef486654bc9393c4ac024 .
The class is mostly consistent now.

2 years ago[flang][OpenMP] Support lowering parse-tree to MLIR for threadprivate directive
Peixin-Qiao [Tue, 7 Jun 2022 07:08:17 +0000 (15:08 +0800)]
[flang][OpenMP] Support lowering parse-tree to MLIR for threadprivate directive

This supports lowering parse-tree to MLIR for threadprivate directive
following the OpenMP 5.1 [2.21.2] standard. Take the following as an
example:

```
program m
  integer, save :: i
  !$omp threadprivate(i)
  call sub(i)
  !$omp parallel
    call sub(i)
  !$omp end parallel
end
```
```
func.func @_QQmain() {
  %0 = fir.address_of(@_QFEi) : !fir.ref<i32>
  %1 = omp.threadprivate %0 : !fir.ref<i32> -> !fir.ref<i32>
  fir.call @_QPsub(%1) : (!fir.ref<i32>) -> ()
  omp.parallel   {
    %2 = omp.threadprivate %0 : !fir.ref<i32> -> !fir.ref<i32>
    fir.call @_QPsub(%2) : (!fir.ref<i32>) -> ()
    omp.terminator
  }
  return
}
```

A threadprivate operation (omp.threadprivate) is created for all
references to a threadprivate variable. The runtime will appropriately
return a threadprivate var (%1 as above) or its copy (%2 as above)
depending on whether it is outside or inside a parallel region. For
threadprivate access outside the parallel region, the threadprivate
operation is created in instantiateVar. Inside the parallel region, it
is created in createBodyOfOp.

One new utility function collectSymbolSet is created for collecting
all the variables with a property within a evaluation, which may be one
Fortran, or OpenMP, or OpenACC construct.

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D124226

2 years ago[flang] Fix XArrayCoorOp conversion for index type slices
Peixin-Qiao [Tue, 7 Jun 2022 06:58:44 +0000 (14:58 +0800)]
[flang] Fix XArrayCoorOp conversion for index type slices

The previous XArrayCoorOp conversion forgot to change getting the
operands from OpAdaptor for upper bound and step of slice. This leads to
the fail of incompatible of types of codegen when slices are index type.

Reviewed By: kiranchandramohan, schweitz

Differential Revision: https://reviews.llvm.org/D125967

2 years ago[flang] Fix semantic checks for C919
Peixin-Qiao [Tue, 7 Jun 2022 06:55:31 +0000 (14:55 +0800)]
[flang] Fix semantic checks for C919

The previous semantic analysis does not consider when the last part-ref
is scalar or complex part. Refactor the previous code and bring all the
checks into one place. The check starts from the designator by
extracting the dataref wrapped including the substring and complex part
and recursively check the base objects.

Co-authored-by: Peter Klausler <pklausler@nvidia.com>
Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D126595

2 years agoReplace Goals and Why section with Introduction
Jeff Bailey [Tue, 7 Jun 2022 06:52:02 +0000 (06:52 +0000)]
Replace Goals and Why section with Introduction

Rewrite the introduction of the page to state clearly the goals of
LLVM's libc project.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D127174

2 years ago[MLIR][SCF] Fix top-level comment (NFC)
lorenzo chelini [Sat, 4 Jun 2022 16:30:03 +0000 (18:30 +0200)]
[MLIR][SCF] Fix top-level comment (NFC)