My apologies, very sorry. I got the good output and bad output backwards.
It is fixed. Very sorry to bother everybody.
On Wed, Mar 18, 2026 at 11:22 AM Zubin Duggal
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 , #26668 (closed) ), 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.
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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]:
[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 _______________________________________________ ghc-devs mailing list -- ghc-devs@haskell.org To unsubscribe send an email to ghc-devs-leave@haskell.org