Implementing a new Primop, stage1 panic

Simon Peyton-Jones simonpj at
Mon Oct 17 16:00:18 CEST 2011


Always switch on -dcore-lint; it's a self-checker for types, and usually nails an error much closer to the source.


From: glasgow-haskell-users-bounces at [mailto:glasgow-haskell-users-bounces at] On Behalf Of Paul Monday
Sent: 16 October 2011 16:54
To: glasgow-haskell-users at
Subject: Implementing a new Primop, stage1 panic

(Reposting since this got cross-posted sort of oddly and I wasn't subscribed yet)

I'm having an odd problem as I try to define my own primop, it seems that some docs may be out of date with respect to all of the touch points for a simple primop addition.  I've followed what the various wiki pages have to offer (primarily and without success.  I even unraveled my PrimOp to be, basically, an exact copy of another PrimOp without luck.

The primop I'm attempting to add is now very, very simple and copies FloatAddOp exactly so there must be an additional file I have to modify before the primop is "completely" added.

Here are my simple modifications:

primop   FloatVAddOp   "plusFloatVec#"      Dyadic
   Float# -> Float# -> Float#
   with commutable = True

translateOp FloatVAddOp  = Just (MO_F_Add W32)

The compiler error is below.  I have the feeling that an interface is not being built somewhere ... this must be a simple one but I can't find any references to this error anywhere ... has anyone seen this one before?????

"inplace/bin/ghc-stage1"   -H64m -O0 -fasm    -package-name ghc-7.3.20111007 -hide-all-packages -i -icompiler/basicTypes -icompiler/cmm -icompiler/codeGen -icompiler/coreSyn -icompiler/deSugar -icompiler/ghci -icompiler/hsSyn -icompiler/iface -icompiler/llvmGen -icompiler/main -icompiler/nativeGen -icompiler/parser -icompiler/prelude -icompiler/profiling -icompiler/rename -icompiler/simplCore -icompiler/simplStg -icompiler/specialise -icompiler/stgSyn -icompiler/stranal -icompiler/typecheck -icompiler/types -icompiler/utils -icompiler/vectorise -icompiler/stage2/build -icompiler/stage2/build/autogen -Icompiler/stage2/build -Icompiler/stage2/build/autogen -Icompiler/../libffi/build/include -Icompiler/stage2 -Icompiler/../libraries/base/cbits -Icompiler/../libraries/base/include -Icompiler/. -Icompiler/parser -Icompiler/utils   -optP-DGHCI -optP-include -optPcompiler/stage2/build/autogen/cabal_macros.h -package Cabal-1.11.2 -package array- -package base- -package bin-package-db- -package bytestring- -package containers- -package directory- -package filepath- -package hoopl- -package hpc- -package old-time- -package process- -package template-haskell- -package unix-  -Wall -fno-warn-name-shadowing -fno-warn-orphans -XHaskell98 -XNondecreasingIndentation -XCPP -XMagicHash -XUnboxedTuples -XPatternGuards -XForeignFunctionInterface -XEmptyDataDecls -XTypeSynonymInstances -XMultiParamTypeClasses -XFlexibleInstances -XRank2Types -XScopedTypeVariables -XDeriveDataTypeable -DGHCI_TABLES_NEXT_TO_CODE -DSTAGE=2 -O0 -fasm  -no-user-package-conf -rtsopts     -odir compiler/stage2/build -hidir compiler/stage2/build -stubdir compiler/stage2/build -hisuf hi -osuf  o -hcsuf hc -c compiler/iface/BinIface.hs -o compiler/stage2/build/BinIface.o
ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 7.3.20111007 for x86_64-unknown-linux):
    ghc-prim:GHC.Prim.sizeofMutableArray#{(w) v 91V} [gid[PrimOp]]
      @ e{tv i4L2} [tv] ds{v i4Lc} [lid] i#{v i4Lg} [lid]
    forall a{tv 12} [tv].
    ghc-prim:GHC.Prim.MutableArray#{(w) tc 31m}
      e{tv i4L2} [tv] a{tv 12} [tv]
    -> ghc-prim:GHC.Prim.Int#{(w) tc 3G}

Paul Monday
Parallel Scientific, LLC.
paul.monday at<mailto:paul.monday at>

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