Minutes_2019_05_21

Attendees: Stuart, Todd, Ehsan, Siu

0. Feature Discussion

• 0.44 RC status
  • llvmlite RC building in the farm (almost done)
  • numba pending changelog merge

1. New issues

• #4098 - numpy.empty() TypingError with structured dtype
  • need better error message for when dtype is not understood
• **** #4097 - np.kron fails to compile under njit with call signature
  • reshape() should handle non-contiguous arrays
  • rabbit hole of partially specified behavior
  • likely we have interpreted the arguments incorrectly
  • candidate for conversion from builder syntax to overload
  • discussion:
    • there are other numpy functions that need to be updated to use @overload.
    • we should ask help from the community to rewrite/update them.
    • Stuart: write ticket for this
• **** #4093 - Memory leak when allocating 1D and 2D numpy arrays inside jitted functions
  • several possible approaches
  • Stuart: Fix it to postproc on end of the array const inliner function.
  • Ticket to fix it properly.
  • Investigate when ir.Del is used (direct and indirect)
  • Stuart: Legalize just ahead of lowering check input == output, i.e. no change
  • Lightweight check at tail of each pass to check for e.g. double ir.Del
• #4092 - Using a non-default device in CuPy leads to error in cuPointerGetAttribute
  • fails in function that is supposed to safeguard against moving pointers between contexts
  • Siu will investigate, but needs a system with GPUs on different PCI-E domains
• #4087 - Python 2.7 heterogeneous list unbox problem
  • low priority because both Python 2.7 and this style of list support is going away
• #4086 - Question: Efficiently shuffle array of fixed-width strings
  • Stan can respond with permute np.arange() idea

Already Closed

2. Open PRs

• #4100 - Fix alignment check on 32-bit.
• #4099 - Fix record alignment test
• **** #4095 - Support ir.Global/FreeVar in find_const()
  • add tests specially around branch-pruning
• #4090 - Update to LLVM8 memset/memcpy intrinsic
  • Worry about post 0.44 release
• **** #4088 - Resolves issue4075.
• **** #4085 - Resolves #3314.

Already merged

• #4096 - Update env-vars for CUDA libraries lookup
• #4094 - Fix function definition finding logic for commented def
• #4091 - Deprecate the use of iternext_impl without RefType
• #4089 - Make the warnings fixer flush work for warning comparing on type.
• #4084 - Fix missing incref on optional return None

Old Active

4. Next Release: Version 0.44, RC=ASAP, Final=May 27 week

• LLVM 8
  • fixes twine bug
  • fixes common symbol bug
• Type-inferred Dict
• Caching improvements requirement gathering
  • transitive dependency
  • bug related to storing runtime-only info
  • may punt on jitclasses
  • may punt on issues of (g)ufunc
  • future: pre-filled/package-able cache
    • open questions:
      • numba version pinning(?)
      • regen cache for different numba versions
      • regen at post-install
• Add deprecation warnings
  • objmode
  • list/set reflection