Invalid assembly in foreign prim

➜  prim_panic ghc Lib.hs
[1 of 1] Compiling Lib              ( Lib.hs, Lib.o )
/tmp/ghc14440_0/ghc_2.s: Assembler messages:

/tmp/ghc14440_0/ghc_2.s:65:0: error:
     Error: number of operands mismatch for `jmp'
`gcc' failed in phase `Assembler'. (Exit code: 1)
➜  prim_panic cat Lib.hs
{-# LANGUAGE GHCForeignImportPrim, UnliftedFFITypes, MagicHash #-}

module Lib where

import GHC.Prim

foreign import prim f1 :: Int# -> Int#

Tried with: HEAD as of today, 8.0.1.

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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