
IGC releases tend to come frequent with a large team working on this open-source graphics compiler code while the 1.0.4944 milestone is a bit of a larger release.
IGC 1.0.4944 has a lot of code refactoring as they are preparing to rebase their compiler against the upstream LLVM 11 code. IGC 1.0.4944 also has multiple improvements to its vector back-end , adding SPIRV-LLVM-Translator, a new option to force thread group sizes, and "many minor optimizations" and code improvements. There are also many fixes.
More details on IGC 1.0.4944 and its many changes via GitHub .