Changes

[DAG] Create fptoui.sat from clamped fptosi

As an extension to D111976, this converts clamp fptosi, clamped between
0 and (2^n)-1 to a fptoui.sat. This can greatly help on targets with
conversions that naturally saturate, such as Arm.

X86 disables the transform as some of the test cases increases in size.
A fptoui.sat necessitates a fp clamp without native support, so there is
little use in converting if the instruction is just going to be
expanded.

Differential Revision: https://reviews.llvm.org/D112428

[JITLink][ELF][x86-64] Adjust addends for R_X86_64_PLT32 relocations.

R_X86_64_PLT32 explicitly represents the '-4' PC-adjustment in the relocation's
addend, but JITLink's x86_64::Branch32PCRel includes the PC-adjustment
implicitly. We have been zeroing the addend to account for the difference, but
this breaks for branches to non-zero offsets past labels. This patch updates the
relocation parsing code to unconditionally adjust the offset by '+4' instead.
For branches directly to labels the result is still 0, for branches to offsets
past labels the result is the correct addend for x86_64::Branch32PCRel.

[MemoryLocation] Use getForArgument in getForSource/getForDest. (NFC)

getForArgument already knows how to extract a memory location for all
memory intrinsics. Use it instead of duplicating the logic.

[X86][FP16] Replace vXi16 to vXf16 instead of v8f16

Fixes pr52561

Reviewed By: LuoYuanke

Differential Revision: https://reviews.llvm.org/D114304

Reland [DwarfDebug] Move emission of global vars, types and imports to endModule()

This patch proposes to move emission of global variables, types,
imported entities, etc from DwarfDebug::beginModule() to DwarfDebug::endModule().
Effectively, this changes nothing but the order of debug entities which
will be as follows:
* subprograms (including related context, local variables/labels,
  local imported entities; related types can be created as a part of
  the emission of local entities of an abstract subprogram);
* global variables (including related context and types);
* retained types and enums;
* non-local-scoped imported entities;
* basic types;
* other types left (as a part of local variables attributes emission).

Note that the order of emitted compile units may also be changed as now we emit
units that contain subprograms first and then all other non-empty units.

The motivation behind this change is the following:
(1) DwarfDebug::beginModule() is run at the very beginning of backend's pipeline,
    from this time IR can be significantly changed by target-specific passes.
    If it happens for debug metadata of global entities, those changes will not
    be reflected in the emitted DWARF.
(2) imported subprogram names should refer to an abstract subprogram if it exists,
    but it isn't known in DwarfDebug::beginModule() (it's possible to make some
    guesses based on location info, but it's not quite reliable);
(3) aforementioned entities if they are scoped within a bracketed block
    (subject of D113741) couldn't be emitted in DwarfDebug::beginModule()
    (they need parent emitted first). Another problem is if to try to gather
    some information about local entities and defer their emission
    (till subprogram's processing or DwarfDebug::endModule()) all the gathered
    details might be irrelevant / invalid by the time the entities are being
    emitted (because of (1)).

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D114705

Reland [DwarfDebug] Support emitting function-local declaration for a lexical block

This is another attempt to make function-local declarations
(like static variables, structs/classes and other) be correctly
emitted within a lexical (bracketed) block.

Fixes https://bugs.llvm.org/show_bug.cgi?id=19238.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D113741

[VPlan] Separate ctors for VPWidenIntOrFpInduction. (NFC)

VPWidenIntOrFpInductionRecipes can either be constructed with a PHI and
an optional cast or a PHI and a trunc instruction. Reflect this in 2
separate constructors. This also simplifies a follow-up change.

[libc++][ci] Disable generating debug information.

In the bootstrap build generating debug information causes an ICE.
This is a work-around for llvm.org/PR52584

Microsoft's floating-point to_chars powered by Ryu and Ryu Printf

Microsoft would like to contribute its implementation of floating-point to_chars to libc++. This uses the impossibly fast Ryu and Ryu Printf algorithms invented by Ulf Adams at Google. Upstream repos: https://github.com/microsoft/STL and https://github.com/ulfjack/ryu .

Licensing notes: MSVC's STL is available under the Apache License v2.0 with LLVM Exception, intentionally chosen to match libc++. We've used Ryu under the Boost Software License.

This patch contains minor changes from Jorg Brown at Google, to adapt the code to libc++. He verified that it works in Google's Linux-based environment, but then I applied more changes on top of his, so any compiler errors are my fault. (I haven't tried to build and test libc++ yet.) Please tell me if we need to do anything else in order to follow https://llvm.org/docs/DeveloperPolicy.html#attribution-of-changes .

Notes:

* libc++'s integer charconv is unchanged (except for a small refactoring). MSVC's integer charconv hasn't been tuned for performance yet, so you're not missing anything.
* Floating-point from_chars isn't part of this patch because Jorg found that MSVC's implementation (derived from our CRT's strtod) was slower than Abseil's. If you're unable to use Abseil or another implementation due to licensing or technical considerations, Microsoft would be delighted if you used MSVC's from_chars (and you can just take it, or ask us to provide a patch like this). Ulf is also working on a novel algorithm for from_chars.
* This assumes that float is IEEE 32-bit, double is IEEE 64-bit, and long double is also IEEE 64-bit.
* I have added MSVC's charconv tests (the whole thing: integer/floating from_chars/to_chars), but haven't adapted them to libcxx's harness at all. (These tests will be available in the microsoft/STL repo soon.)
* Jorg added int128 codepaths. These were originally present in upstream Ryu, and I removed them from microsoft/STL purely for performance reasons (MSVC doesn't support int128; Clang on Windows does, but I found that x64 intrinsics were slightly faster).
* The implementation is split into 3 headers. In MSVC's STL, charconv contains only Microsoft-written code. xcharconv_ryu.h contains code derived from Ryu (with significant modifications and additions). xcharconv_ryu_tables.h contains Ryu's large lookup tables (they were sufficiently large to make editing inconvenient, hence the separate file). The xmeow.h convention is MSVC's for internal headers; you may wish to rename them.
* You should consider separately compiling the lookup tables (see https://github.com/microsoft/STL/issues/172 ) for compiler throughput and reduced object file size.
* See https://github.com/StephanTLavavej/llvm-project/commits/charconv for fine-grained history. (If necessary, I can perform some rebase surgery to show you what Jorg changed relative to the microsoft/STL repo; currently that's all fused into the first commit.)

Differential Revision: https://reviews.llvm.org/D70631

[gn build] (semiautomaticallly) port a8025e06fc0f (libc++ ryu)

Remove duplicate comment

The same comment appears in the very next line.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D115018

Follow-up for D113741: fix DebugInfo/Generic/lexical_block_static.ll on MachO

[InstCombine] add tests for icmp with mul op with known bits; NFC

D114962

[InstSimplify] add/adjust tests for 'or' logic fold; NFC

The last test shows a miscompile:
https://alive2.llvm.org/ce/z/s5xy55

[InstSimplify] fix logic fold of 'or' for vectors

Reduce code duplication for commutative pattern matching
and fix a miscompile.

We can't safely propagate an undef element in this transform:
https://alive2.llvm.org/ce/z/s5xy55

[llvm] Use range-based for loops (NFC)

[libc++][doc] Update format implementation status.

[gn build] port a8025e06fc0f more

src/ryu/*.cpp includes files relative to src, so src/ needs
to be passes as -I flag now.

[libc++] Fix an include-guard comment. NFC.

[libc++] Add missing `#pragma GCC system_header` in a few headers. NFCI.

[libc++] Adjust space-alignment in module.modulemap. NFC.

Fix `-Wunused-variable` warning. NFC.

Fix TOSA verifier to emit verbose errors

Also as a test for invalid ops which was missing.

Test commit to check access.

[CMake] Installable find modules for terminfo and libffi

Improves cross-distro portability of LLVM cmake package by resolving paths for
terminfo and libffi via import targets.

When LLVMExports.cmake is generated for installation, it contains absolute
library paths which are likely to be a common cause of portability issues. To
mitigate this, the discovery logic for these dependencies is refactored into
find modules which get installed alongside LLVMConfig.cmake. The result is
cleaner, cmake-friendly management of these dependencies that respect the
environment of the LLVM package importer.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D114327

[lld-macho] Unreferenced weak dylib symbols shouldn't fetch archive symbols

We were fetching archive symbols too eagerly, bloating binary size as well as
just screwing up binaries that expected to look up certain symbols only at
runtime.

Reviewed By: #lld-macho, oontvoo

Differential Revision: https://reviews.llvm.org/D115092