Btw, now that I saw that commit, I've seen other testcases making use of
#8832: Constant-folding regression wrt `clearBit (bit 0) 0 ` -------------------------------------+------------------------------------- Reporter: hvr | Owner: thoughtpolice Type: bug | Status: closed Priority: high | Milestone: 7.10.1 Component: Compiler | Version: 7.8.1-rc2 Resolution: fixed | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: Runtime | Blocked By: performance bug | Related Tickets: Test Case: | simplCore/should_compile/T8832 | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by rwbarton): Replying to [comment:18 hvr]: the pre-defined `SIZEOF_HSWORD` (and there's also `WORD_SIZE_IN_BITS`) CPP symbol to test for wordsize. Would that have worked as well? Predefined by what? I tried `ghc -E -optP-dM -cpp foo.hs; cat foo.hspp` as suggested somewhere in the User's Guide to see what C preprocessor symbols were automatically defined and there wasn't anything like that among them. Or do you mean `#include`ing one of GHC's header files? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8832#comment:19 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler