#9505: Bounded instance for Word (and possibly others) uses explicitly unboxed literals -------------------------------------+------------------------------------- Reporter: schyler | Owner: ekmett Type: bug | Status: new Priority: normal | Milestone: Component: Core | Version: 7.8.2 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * cc: dfeuer, core-libraries-committee@… (added) * owner: => ekmett * component: Compiler => Core Libraries Comment: For reference, from `libraries/base/GHC/Enum.hs`: {{{ #!haskell instance Bounded Word where minBound = 0 -- use unboxed literals for maxBound, because GHC doesn't optimise -- (fromInteger 0xffffffff :: Word). #if WORD_SIZE_IN_BITS == 32 maxBound = W# (int2Word# 0xFFFFFFFF#) #elif WORD_SIZE_IN_BITS == 64 maxBound = W# (int2Word# 0xFFFFFFFFFFFFFFFF#) #else #error Unhandled value for WORD_SIZE_IN_BITS #endif }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9505#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler