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Document that compiler basic blocks may remain in an active STD or Tile architectural block, allowing redundant FALL-STD headers to be omitted on proven sequential CFG edges. Keep branch targets, non-fallthrough transfers, block-type changes, and final commit boundaries explicit.
This was referenced Sep 12, 2026
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## Summary - Clarify `PTO-REQ-SCALAR-BODY-ENTRY-001` that the first decoded scalar instruction may enter the body of any active block kind, explicitly including Tile blocks. - Preserve the active Tile block kind during scalar body entry. - Add an executable AVS point with no intervening `C.BSTART.STD`. This closes documentation/evidence around the behavior already accepted by issue #191 and ADR-BLOCK-0012. It changes no instruction encoding, decoder, block state, or execution transition. ## Validation - `make pr-check`: **10/10 PASS** - exact focused ASL matrix selected by `scripts/prepare-pr`: **17/17 PASS** - new Tile-block scalar-body AVS: PASS - `git diff --check`: PASS Independent exact-input review remains required before merge, as reported by `scripts/prepare-pr`. Downstream implementation: [LinxISA/llvm-project#92](LinxISA/llvm-project#92). LinxISA implementer guidance: [LinxISA/linx-isa#201](LinxISA/linx-isa#201). Co-authored-by: zhoubot <637081+zhoubot@users.noreply.github.com>
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Summary
BSTART.STD FALL/C.BSTART.STD FALLto be omitted on proven unique sequential CFG edges when scalar instructions remain in an active STD or Tile block.This is implementer guidance for the existing PTO v0.58 scalar body-entry contract. It changes no opcode, encoding, PTO lock, or runtime semantics.
Formal evidence: PTO-ISA/pto-spec#273. LLVM implementation: LinxISA/llvm-project#92.
Validation
python3 docs/check_documentation.py --root .: PASSbash tools/ci/check_repo_layout.sh: PASSgit diff --check: PASS