[RISC-V] Test ELF e_flags for llc -target-abi without module flag (#225128)
Verify that `llc -filetype=obj -target-abi=...` sets the ELF header
`e_flags`
according to `-target-abi` even when the input IR has no `"target-abi"`
module
flag and the enabled extensions (such as `+d`) would default to a
different ABI.
This commit was created with the help of AI tools
[CIR] Lowering for the C2Y `stdc` bit builtins (#218852)
Implemented CIR lowering for the C2Y `stdc` bit builtins currently
covered by this PR.
This adds support for:
- `stdc_rotate_left_*` / `__builtin_stdc_rotate_left`
- `stdc_rotate_right_*` / `__builtin_stdc_rotate_right`
- `stdc_memreverse8u8/u16/u32/u64`
- `stdc_memreverse8` / `__builtin_stdc_memreverse8`
The rotate builtins lower to `cir.rotate`, which then lowers to the LLVM
funnel-shift intrinsics.
For `stdc_memreverse8`, CIR matches classic CodeGen behavior:
- sizes `0` and `1` are no-ops, while still evaluating the pointer
argument
[5 lines not shown]
[CIR] Expand callee-side va_arg on x86_64 (#222420)
CallConvLowering now classifies every `cir.va_arg` on its own, as an
unnamed argument with a full register budget, and expands it in place. A
fetch that fits the budget reads from the saved register area, and
everything else reads the overflow area and bumps the cursor. An
aggregate, an x87 long double, and an `__int128` all lower correctly
now. Each fetch reads at the alignment the argument area gives it, which
for an over-aligned record is higher than its type reports.
A non-trivially-copyable type still reports NYI.
`rewriteVAArg` takes the register demand from the ABI library rather
than rebuilding it from the shape of the coerced type. The library
computes it in `classifyArgumentType` as the `NeededInt` and `NeededSSE`
out-parameters and used to drop it, so `llvm::abi::ArgInfo` and
`mlir::abi::ArgClassification` now carry it. Expanding a `cir.va_arg`
needs the inputs to that decision rather than its result, because the
choice has to become a runtime branch on the va_list cursor.
Assisted-by: Cursor / claude-opus-5
Drop IntrArgMemOnly from the resource atomic intrinsics
Neither intrinsic has a pointer-typed argument, so IntrArgMemOnly claims
that they access no memory at all. Omit the attribute so they keep the
conservative read-write default, as the other resource intrinsics do.
Revert "[lit] Add --rerun-failed-serially <REGEX> mechanism (#223504)" (#225205)
This reverts commit 49923e950b3e8f0adb693aa68b99df6a2479418b.
People reported flakyness in the LIT test for this lit change.
