[libc] Add POSIX redirection header specifications in YAML (#211859)
Add header YAML specifications for memory.h, sys/poll.h, sys/unistd.h,
sys/fcntl.h, and sys/signal.h using public_includes.
POSIX.1-2017 and historical X/Open System Interfaces (XSI) standards
define these headers as alternate or legacy header locations that
forward to string.h, poll.h, unistd.h, fcntl.h, and signal.h
respectively. The YAML header specs allow hdrgen to generate the public
headers automatically with proper license headers and guards.
Updated Linux target headers.txt configuration files to register the new
public header targets for installation.
Assisted-by: Automated tooling, human reviewed.
[AMDGPU] Add synthetic apertures and use them for barriers
Define what a synthetic aperture is, and adjust the barrier AS
to use this new system. This makes the barrier AS even safer to
use as now we can use all 32 bits of it without ever risking
hitting a valid address of any kind (LDS or outside LDS).
[RFC][AMDGPU] Add BARRIER address space
Add a new BARRIER address space that is used for global variables that are used to represent the barrier IDs in GFX12.5.
These barrier addresses just have values corresponding 1-1 to barrier IDs. They are still implemented on top of LDS, but the offsetting happens during an addrspacecast to generic, not whenever the barrier GV is used.
The motivation for this is to make the relation between LDS and barrier GVs explicit in the compiler. It does add a bit more complexity, but that complexity was already there, just hidden by pretending barrier GVs were actual LDS.
[clang][AMDGPU] Clean-up handling of named barrier type
- Allow the type in struct/classes in very limited circumstances. The goal is to enable creating trivial wrappers around the named barrier variable, but ensure we can't get into situations where things would get awkward. Currently this means we only allow the named barrier in RecordDecls with exactly 1 field, that have no base class, and are not inherited.
- Use a `amdgpu_barrier` LangAS for this type that currently maps to the local AS. This allows easy switching to the barrier AS in a future patch.
[libc][stdlib] Add putenv (#208339)
Added the POSIX putenv() function and its internal support.
Implemented EnvironmentManager::put() to insert caller-provided
"name=value" strings directly into the environment array, managing
ownership correctly (caller retains ownership).
Registered for x86_64, aarch64, and riscv. Integration tests cover basic
operations, ownership semantics, validation, and edge cases.
Assisted-by: Automated tooling, human reviewed.
[Driver][SYCL] Add compile-time device library linking for SPIR-V targets (#196656)
This PR implements compile-time device library linking for SYCL
offloading to SPIR-V targets, using `libclang_rt.builtins.bc` - an
in-tree compiler-rt artifact produced alongside the existing
`libclang_rt.builtins.a` for `SPIRV64`.
## Motivation
SYCL device compilations targeting SPIR-V need access to compiler
builtins (integer arithmetic, floating-point helpers, etc.) at compile
time so the compiler can optimize across user code and builtins, inline
aggressively, and eliminate dead code. This PR lays the foundation by
wiring up the first in-tree device library : `libclang_rt.builtins.bc` -
using the same `-mlink-builtin-bitcode` mechanism already used by
`libclc` and `HIP`.
## Changes
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libsysdecode: fix nlm_flag regex in mktables
Some NLM_F_ definitions contain multiple underscores in their name; this
should pick them up.
Reviewed by: kp, Ishan Agrawal <iagrawal9990 at gmail.com>
Fixes: 4c932a4d45fb ("netlink: decode netlink message flags symbolically")
Sponsored by: The FreeBSD Foundation
Pull Request: https://github.com/freebsd/freebsd-src/pull/2340
AMDGPU: Migrate assembler tests with content changes to subarch triples (#212495)
Convert tests which failed after converting the arguments due to content
changes from checking the emitted target id string.
[libc++] Fix ungetc failing after xsgetn (#210951)
After #206453 we don't correctly handle `unget()` anymore. This fixes
the issue by updating the internal buffer to contain the tail of the
read data.
Fixes #210203
[HIP] Support device-only linking of bitcode offload binaries (#212342)
The new offload driver packages multi-architecture bitcode in LLVM
offload binaries. A later `--hip-link --offload-device-only`
invocation treated these `.bc` inputs as host LLVM IR and dropped
them before linking.
Pass these inputs directly to clang-linker-wrapper when producing a
device fat binary. The wrapper can then extract and link each
requested GPU architecture.
[AMDGPU] Stop rounding up LDS block size for gfx950 (#208046)
The AMDGPUAsmPrinter::getSIProgramInfo function calculates the number of
LDS blocks in a somewhat indirect way: It obtains the LDS granularity
from another function, determines an "LDSAlignShift" based on this and
then uses shifts to determine the alignment and for division. The use of
shifts forces the alignment to be a power of two which works for all LDS
granularity values except for the value of 1280 bytes used for gfx950.
For this, the function uses LDSAlignShift = 11 which means that the
block size gets rounded up to 2048. This implies that the computed
number of LDS blocks is too small.
Remove the use of LDSAlignShift from getSIProgramInfo and use the LDS
granularity directly for alignment and division.
[offload][lit] Run check-offload as part of check-all (#212500)
It's unclear why these were excluded from `check-all`, but we made all
tests pass on Level Zero and our local testing shows they pass on AMD
and NVIDIA too, so enable it by default.
Context: https://github.com/llvm/llvm-project/pull/211633
Signed-off-by: Nick Sarnie <nick.sarnie at intel.com>
