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changelog.md

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Mojo unreleased changelog

This is a list of UNRELEASED changes for the Mojo language and tools.

When we cut a release, these notes move to changelog-released.md and that's what we publish.

[//]: # Here's the template to use when starting a new batch of notes: [//]: ## UNRELEASED [//]: ### ✨ Highlights [//]: ### Language changes [//]: ### Standard library changes [//]: ### Tooling changes [//]: ### ❌ Removed [//]: ### 🛠️ Fixed

UNRELEASED

✨ Highlights

Language changes

  • The Mojo comptime interpreter can now handle many more LLVM intrinsics, including ones that return floating point values. This allows functions like round to be constant folded when used in a comptime context.

Standard library changes

  • A new IntervalTree data structure has been added to the standard library. This is a tree data structure that allows for efficient range queries.

  • The Char type has been renamed to Codepoint, to better capture its intended purpose of storing a single Unicode codepoint. Additionally, related method and type names have been updated as well, including:

    • StringSlice.chars() to .codepoints() (ditto for String)

    • StringSlice.char_slices() to .codepoint_slices() (ditto for String)

    • CharsIter to CodepointsIter

    • unsafe_decode_utf8_char() to unsafe_decode_utf8_codepoint()

    • Make the iterator type returned by the string codepoint_slices() methods public as CodepointSliceIter.

  • StringSlice now supports several additional methods moved from String. The existing String methods have been updated to instead call the corresponding new StringSlice methods:

    • split()
    • lower()
    • upper()
    • is_ascii_digit()
    • isupper()
    • islower()
    • is_ascii_printable()
    • rjust()
    • ljust()
    • center()

  • Added a StringSlice.is_codepoint_boundary() method for querying if a given byte index is a boundary between encoded UTF-8 codepoints.

  • Added an iterator to LinkedList (PR #4005)

    • LinkedList.__iter__() to create a forward iterator.
    • LinkedList.__reversed__() for a backward iterator.
    var ll = LinkedList[Int](1, 2, 3)
for element in ll:
  print(element[])

  • The round function is now fixed to perform "round half to even" (also known as "bankers' rounding") instead of "round half away from zero".

  • The SIMD.roundeven() method has been removed from the standard library. This functionality is now handled by the round() function.

GPU changes

  • ctx.enqueue_function(compiled_func, ...) is deprecated:
  from gpu import thread_idx
  from gpu.host import DeviceContext

  fn func():
      print("Hello from GPU thread:", thread_idx.x)

  with DeviceContext() as ctx:
      var compiled_func = ctx.compile_function[func]()
      ctx.enqueue_function(compiled_func, grid_dim=1, block_dim=4)

You should now pass the function directly to DeviceContext.enqueue_function[func](...):

  with DeviceContext() as ctx:
      ctx.enqueue_function[func](grid_dim=1, block_dim=4)

  • The shuffle module has been rename to warp to better reflect its purpose. To uses now you will have to do

    import gpu.warp as warp

var val0 = warp.shuffle_down(x, offset)
var val1 = warp.broadcast(x)

Tooling changes

Mojo Compiler

Mojo compiler now warns about parameter for with large loop unrolling factor (>1024 by default) which can lead to long compilation time and large generated code size. Set --loop-unrolling-warn-threshold to change default value to a different threshold or to 0 to disable the warning.

❌ Removed

🛠️ Fixed