Add matt's 2025Q3 update

Author: mborland

_posts/2025-10-06-Matts2025Q3Update.md

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+---
+layout: post
+nav-class: dark
+categories: matt
+title: Decimal Goes Back to Review
+author-id: matt
+author-name: Matt Borland
+---
+
+We are excited to announce that the Decimal ([https://github.com/cppalliance/decimal](https://github.com/cppalliance/decimal)) library is going back to review for inclusion in Boost from 06 to 15 October.
+In preparation for this we have made quite a few changes since the indeterminate end of the first review about 9 months ago:
+
+Breaking Changes:
+- Based on bitwise comparisons with other similar libraries and database software, we have changed the internal encoding of our IEEE 754-compliant types
+- We spent about 3 months optimizing just back end integer types that are now used throughout the library, and as the internals of decimal128_t
+- We have changed the type names to better match conventions:
+    - `decimalXX` is now `decimalXX_t`
+    - `decimalXX_fast` is now `decimal_fastXX_t`
+- The headers have been similarly renamed (e.g. decimal32.hpp -> decimal32_t.hpp), and can now be used independently instead of requiring the monolith based on feedback in Review
+- Constructors have been simplified to reduce confusion (no more double negative logic)
+- The default rounding mode has changed to align with IEEE 754, with rounding bugs being squashed across the modes as well
+
+Other Changes:
+- The documenation content has been overhauled thanks to feedback from Peter Turcan and others during the first review
+- The docs are no longer a single long page of Asciidoc; we have moved to Antora. Thanks to Joaquín and Christian for making it trivial to copy from Unordered to make that happen.
+    - https://develop.decimal.cpp.al/
+- We now support formatting with {fmt}
+- Benchmarks have been expanded to include GCC `_DecimalXX` types, and Intel's libbid. I think people should be pleased with the results now, since that was a huge point of contention at the end of the review
+- We have added support for CMake pkg config for ease of use
+- Every post-review issue John was kind enough to consolidate and open have been addressed: https://github.com/cppalliance/decimal/issues?q=is%3Aissue%20state%3Aclosed%20label%3A%22Boost%20Review%22
+
+Continued Developments:
+
+- I think the only unaddressed comment from the first review is support for hardware decimal floating point types.
+There are a few rarer architectures that have native decimal floating point units like POWER10.
+Is it possible to fully integrate these native types for use in the library?
+Armed with a compiler farm account I have begun developing a wrapper around the native types that seems to work.
+Stay tuned.
+
+- One item that we have considered, but have not put any effort into yet would be getting the library running on CUDA platforms.
+If this is a feature that you are interested in, please let us know!
+
+- As is always the case with Boost reviews, regardless of the outcome I am sure that we will receive lots of feedback on how to improve the library.
+
+If you are interested, much of the contents of the first review can be found in the original thread on the boost mailing list archive: https://lists.boost.org/archives/list/boost@lists.boost.org/thread/AGFOQZMJ4HKKQ5C5XDDKNJ3VJL72YTWL/