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 <
>ghc-devs@haskell.org> 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/)
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>>   * [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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