[AArch64][GlobalISel] Lower unmerge to extract_subvector (#195046)
This follows and reuses the existing lowering for unmerge -> extract
vector element, extending it to also lower unmerge -> subvector extract
for half-sized vector extracts. This allows certain tablegen patterns to
match.
An extra extract_subvector(dup) combine is needed to optimize away
unnecessary instructions. The ext vs mov/dup brings us in-line with
SDAG, but we may change both to use mov/dup.
[NFCI] clarify that asan-*linux.cpp files affect *nix OS'es (#195565)
**Prior Work:** Aims to supersede (#132263), which seems inactive,
specifically by applying my own comment:
https://github.com/llvm/llvm-project/pull/132263#issuecomment-3051238734
**Context:** It aims to minimally document that the
`asan_(malloc_)?linux.cpp` files may impact non-linux OS'es (despite the
name) such as Solaris, BSD, and other *nix OS'es. This is worth
documenting as otherwise we risk breakage due to confusion, as occurred
[here](https://github.com/llvm/llvm-project/pull/131975#issuecomment-2741097471).
This is done simply by minimally augmenting the file header comment
saying precisely this.
Unlike the prior PR, this does not rename any files, which should reduce
the 'git noise' impact of this change.
_Thanks!_
[InstCombine] Remove redundant assume fold (#195852)
The fold is fully redundant with the fold using `computeKnownBits`, so
we can let that do the work instead.
[lldb][windows] fix cross DLL file descriptor lookup crash (#195855)
On Windows, file descriptors are only valid in the same DLL: they are
really just handles mapped to an index in a table in the CRT. Calling a
liblldb method with a file descriptor from lldb-dap will cause the
program to crash. See
https://github.com/llvm/llvm-project/issues/193971.
This patch fixes the issue by refactoring the `NativeFile` constructors
so that they no longer try to convert `FILE` types to handles through
the CRT lookup table.
libusb: fix incorrect status type when completion on cancel the events
Reviewed by: lwhsu, markj
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D51736
PeepholeOpt: Clear kill flags in foldImmediate (#195680)
When foldImmediate replaces a COPY destination with its source,
this extends the live range of the source, but it does not update the
kill flags.
Clear kill flags on the source register after replacement.
This was found while working on REG_SEQUENCE optimizations motivated by
AMDGPU demands. Both an AMDGPU and an X86 test case are added to show that
the issue is not AMDGPU specific.
[mlir][vector] Account for subview offset in gather lowering. (#195359)
Strided vector.gather on a column subview was reading the wrong column
because the rewrite to a collapsed gather dropped the subview's static
offset.
---------
Signed-off-by: hanhanW <hanhan0912 at gmail.com>
[AArch64][llvm] Tighten SYSP; don't disassemble invalid encodings
Tighten SYSP aliases, so that invalid encodings are disassembled
to `<unknown>`. This is because:
```
Cn is a 4-bit unsigned immediate, in the range 8 to 9
Cm is a 4-bit unsigned immediate, in the range 0 to 7
op1 is a 3-bit unsigned immediate, in the range 0 to 6
op2 is a 3-bit unsigned immediate, in the range 0 to 7
```
Ensure we check this when disassembling, and also constrain
tablegen for compile-time errors of invalid encodings.
Also adjust the testcases in `armv9-sysp-diagnostics.s` and
`llvm/test/MC/AArch64/armv9a-sysp.s` as they were invalid,
and added a few invalid (outside of range) SYSP-alikes to
test that `<unknown>` is printed
