Place dynamic condition cleanups before branching
A dynamic user condition can create expression temporaries before the
selected variant is lowered. For example, a metadirective condition
such as:
when(user={condition(getbool("hello"))}: barrier)
passes a character literal through an associated temporary. That
temporary belongs to evaluating the condition, so it must be cleaned
up before lowering enters the generated fir.if that selects between
variants.
Finalize the statement context after evaluating the condition and
before creating the branch. Keep the condition expression and source
location together as DynamicUserCondition, use that source for
generated operations, and add a regression for the temporary-producing
condition case.
Clarify dynamic metadirective selection lowering
Explain that statically applicable variants are ranked before dynamic
user conditions. When a dynamic condition is selected, it is lowered to a
runtime branch whose else region continues selection among the remaining
candidates.
Add a begin/end variant test that includes clauses, and tighten checks
for the empty `nothing` fallback.
[AMDGPU] Implement -amdgpu-spill-cfi-saved-regs
These spills need special CFI anyway, so implementing them directly
where CFI is emitted avoids the need to invent a mechanism to track them
from ISel.
Change-Id: If4f34abb3a8e0e46b859a7c74ade21eff58c4047
Co-authored-by: Scott Linder scott.linder at amd.com
Co-authored-by: Venkata Ramanaiah Nalamothu VenkataRamanaiah.Nalamothu at amd.com
[AMDGPU] Implement CFI for CSR spills
Introduce new SPILL pseudos to allow CFI to be generated for only CSR
spills, and to make ISA-instruction-level accurate information.
Other targets either generate slightly incorrect information or rely on
conventions for how spills are placed within the entry block. The
approach in this change produces larger unwind tables, with the
increased size being spent on additional DW_CFA_advance_location
instructions needed to describe the unwinding accurately.
Change-Id: I9b09646abd2ac4e56eddf5e9aeca1a5bebbd43dd
Co-authored-by: Scott Linder <scott.linder at amd.com>
Co-authored-by: Venkata Ramanaiah Nalamothu <VenkataRamanaiah.Nalamothu at amd.com>
[AMDGPU] Emit entry function Dwarf CFI
Entry functions represent the end of unwinding, as they are the
outer-most frame. This implies they can only have a meaningful
definition for the CFA, which AMDGPU defines using a memory location
description with a literal private address space address. The return
address is set to undefined as a sentinel value to signal the end of
unwinding.
Change-Id: I21580f6a24f4869ba32939c9c6332506032cc654
Co-authored-by: Scott Linder <scott.linder at amd.com>
Co-authored-by: Venkata Ramanaiah Nalamothu <VenkataRamanaiah.Nalamothu at amd.com>
[AMDGPU] Implement CFI for non-kernel functions
This does not implement CSR spills other than those AMDGPU handles
during PEI. The remaining spills are handled in a subsequent patch.
Change-Id: I5e3a9a62cf9189245011a82a129790d813d49373
Co-authored-by: Scott Linder <scott.linder at amd.com>
Co-authored-by: Venkata Ramanaiah Nalamothu <VenkataRamanaiah.Nalamothu at amd.com>
[Clang] Default to async unwind tables for amdgcn
To avoid codegen changes when enabling debug-info (see
https://bugs.llvm.org/show_bug.cgi?id=37240) we want to
enable unwind tables by default.
There is some pessimization in post-prologepilog scheduling, and a
general solution to the problem of CFI_INSTRUCTION-as-scheduling-barrier
should be explored.
Change-Id: I83625875966928c7c4411cd7b95174dc58bda25a
[MC][Dwarf] Add custom CFI pseudo-ops for use in AMDGPU
While these can be represented with .cfi_escape, using these pseudo-cfi
instructions makes .s/.mir files more readable, and it is necessary to
support updating registers in CFI instructions (something that the
AMDGPU backend requires).
Change-Id: I763d0cabe5990394670281d4afb5a170981e55d0
[MIR] Error on signed integer in getUnsigned
Previously we effectively took the absolute value of the APSInt, instead
diagnose the unexpected negative value.
Change-Id: I4efe961e7b29fdf1d5f97df12f8139aac12c9219
[clang] implement CWG2064: ignore value dependence for decltype
The 'decltype' for a value-dependent (but non-type-dependent) should be known,
so this patch makes them non-opaque instead.
This patch also implements what's neceessary to allow overloading
on pure differences in instantiation dependence, making `std::void_t`
usable for SFINAE purposes.
This also readds a few test cases from da98651, which was a previous attempt
at resolving CWG2064.
Fixes #8740
Fixes #61818
Fixes #190388
lang/rust-nightly: update 1.97.0.20260511 → 1.98.0.20260526
- Enable miri
- Include a patch from upstream PR to avoid network access during build
Approved by: rust (implicit)
