Can you clarify what behavior you are seeing? I just tested
with fresh install
❯ test/bin/ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.12.3.20260311
❯ test/bin/ghc $PROJECT_DIR/Main.hs -fforce-recomp
[1 of 2] Compiling Main ( /home/zubin/ghcs/exprType/Main.hs,
/home/zubin/ghcs/exprType/Main.o )
[2 of 2] Linking /home/zubin/ghcs/exprType/Main [Objects changed]
❯ cat $PROJECT_DIR/Main.hs
{-# OPTIONS_GHC -O #-}
import Data.Word
prop :: Word8 -> IO ()
prop x = do
print (x, x `quot` 7, x `rem` 7, x `quotRem` 7)
{-# NOINLINE prop #-}
main :: IO ()
main = prop 0
❯ /home/zubin/ghcs/exprType/Main
(0,0,0,(0,0))
On 26/03/18 11:01, George Colpitts wrote:
Hello
Below it states
- Fixed a critical code generation regression where sub-word division
produced incorrect results (#26711 </ghc/ghc/-/issues/26711>, #26668
(closed) </ghc/ghc/-/issues/26668>), similar to the bug fixed in 9.12.2
However when I test 26711 it on 9.12.3.20260311 ( 9.12.3.20260311) on my
Apple Silicon Mac it is still broken, I've updated 26711. Maybe the above
means that just 26668 is fixed but 26711 is not?
On Fri, Mar 13, 2026 at 6:15 AM Zubin Duggal via ghc-devs <
[email protected]> wrote:
The GHC developers are very pleased to announce the availability
of the release candidate for GHC 9.12.4. Binary distributions, source
distributions, and documentation are available at [downloads.haskell.org][]
and
via [GHCup](https://www.haskell.org/ghcup/).
GHC 9.12.4 is a bug-fix release fixing many issues of a variety of
severities and scopes, including:
* Fixed a critical code generation regression where sub-word division
produced
incorrect results (#26711, #26668), similar to the bug fixed in 9.12.2
* Numerous fixes for register allocation bugs, preventing data corruption
when spilling and reloading registers
(#26411, #26526, #26537, #26542, #26550)
* Fixes for several compiler crashes, including issues with
CSE (#25468), SetLevels (#26681),
implicit parameters (#26451), and the type-class specialiser (#26682)
* Fixed cast worker/wrapper incorrectly firing on INLINE functions (#26903)
* Fixed LLVM backend miscompilation of bit manipulation operations
(#20645, #26065, #26109)
* Fixed associated type family and data family instance changes not
triggering
recompilation (#26183, #26705)
* Fixed negative type literals causing the compiler to hang (#26861)
* Improvements to determinism of compiler output (#26846, #26858)
* Fixes for eventlog shutdown deadlocks (#26573)
and lost wakeups in the RTS (#26324)
* Fixed split sections support on Windows (#26696, #26494) and the LLVM
backend (#26770)
* Fixes for the bytecode compiler, PPC native code generator, and Wasm
backend
* The runtime linker now supports COMMON symbols (#6107)
* Improved backtrace support: backtraces for `error` exceptions are now
evaluated at throw time
* `NamedDefaults` now correctly requires the class to be standard or have
an
in-scope default declaration, and handles poly-kinded classes (#25775,
#25778, #25882)
* ... and many more
A full accounting of these fixes can be found in the
[release notes][]. As always, GHC's release status, including planned
future
releases, can be found on the GHC Wiki [status][].
This release candidate will have a two-week testing period. If all goes
well
the final release will be available the week of 26 March 2026.
GHC development is sponsored by:
* [Juspay](https://juspay.com/)
* [QBayLogic](https://qbaylogic.com/)
* [Channable](https://www.channable.com/)
* [Haskell Foundation](https://haskell.foundation/)
* [Serokell](https://serokell.io/)
* [Well-Typed](https://well-typed.com/)
* [Tweag](https://www.tweag.io/)
* [Dotcom-Monitor](https://www.dotcom-monitor.com/)
* [LoadView](https://www.loadview-testing.com/)
* [Web Hosting Buddy](https://webhostingbuddy.com/)
* [Find My Electric](https://www.findmyelectric.com/)
* [Standard Chartered](https://www.sc.com)
* [UpCloud](https://upcloud.com)
* [Mercury](https://mercury.com)
We would like to thank these sponsors and other anonymous contributors
whose on-going financial and in-kind support has facilitated GHC
maintenance
and release management over the years. Finally, this release would not have
been possible without the hundreds of open-source contributors whose work
comprise this release.
As always, do give this release a try and open a [ticket][] if you see
anything amiss.
[release notes]:
https://gitlab.haskell.org/ghc/ghc/-/blob/ghc-9.12/docs/users_guide/9.12.4-notes.rst?ref_type=heads&plain=1
[status]: https://gitlab.haskell.org/ghc/ghc/-/wikis/GHC-status
[downloads.haskell.org]: https://downloads.haskell.org/ghc/9.12.4-rc1
[ticket]: https://gitlab.haskell.org/ghc/ghc/-/issues/new
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