[all-commits] [llvm/llvm-project] 5b7a7e: [NVPTX] Fix code generation for `trap-unreachable`...

[Christian Sigg via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5b7a7ec5a2106772de90a59c52e9fac7481f7e8a
      https://github.com/llvm/llvm-project/commit/5b7a7ec5a2106772de90a59c52e9fac7481f7e8a
  Author: Christian Sigg <chsigg at users.noreply.github.com>
  Date:   2023-10-01 (Sun, 01 Oct 2023)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/Target/NVPTX/NVPTX.h
    M llvm/lib/Target/NVPTX/NVPTXInstrInfo.td
    M llvm/lib/Target/NVPTX/NVPTXLowerUnreachable.cpp
    M llvm/lib/Target/NVPTX/NVPTXTargetMachine.cpp
    M llvm/test/CodeGen/NVPTX/unreachable.ll

  Log Message:
  -----------
  [NVPTX] Fix code generation for `trap-unreachable`. (#67478)

https://reviews.llvm.org/D152789 added an `exit` op before each
`unreachable`. This means we never get to the `trap` instruction.

This change limits the insertion of `exit` instructions to the cases
where `unreachable` is not lowered to `trap`. Trap itself is changed to
be emitted as `trap; exit;` to convey to `ptxas` that it exits the CFG.