@duog has documented workarounds in
https://gitlab.haskell.org/ghc/ghc/-/issues/21936:
These /ghc/ flags reproduce -O0:
-optlo-passes='module(default<O0>,function(mem2reg),globalopt,function(lower-expect))'
-fno-llvm-tbaa -O0
These /ghc/ flags reproduce -O1:
-optlo-passes='module(default<O1>,globalopt)' -O1 -fno-llvm-tbaa
These /ghc/ flags reproduce -O2:
-optlo-passes='module(default<O2>)' -O2 -fno-llvm-tbaa
On Tue, Apr 25, 2023 at 11:35 AM George Colpitts
the bug for this is https://gitlab.haskell.org/ghc/ghc/-/issues/22954
On Tue, Apr 25, 2023 at 10:54 AM George Colpitts < george.colpitts@gmail.com> wrote:
Thanks Moritz. I went ahead and tried it. On a very simple smoke test I observed that "-fllvm works" but "-O2 -fllvm" does not. It fails with "Cannot use -O# with legacy PM.". There is already a bug for changing ghc to work with the new pass manager. It wasn't clear to me that this would be needed for llvm 16. It seems that it is.
Cheers George
On Mon, Apr 24, 2023 at 10:02 PM Moritz Angermann < moritz.angermann@gmail.com> wrote:
Hi George,
while I personally haven’t tried. I’d encourage you to just try. Unless they changed their textual IR (they don’t do that often anymore), it could just work.
Whether or not you run into bugs for the specific target you are looking at, is hard to say without knowing the target.
My suggestion would be to just try building your configuration with the llvm backend against llvm16, and run validate if you can.
Cheers, Moritz
On Tue, 25 Apr 2023 at 4:50 AM, George Colpitts < george.colpitts@gmail.com> wrote:
Hi
Does anybody know if llvm 16 works with ghc 9.6.1 ?
Thanks George
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