#11296: T8726 fails on arm -------------------------------------+------------------------------------- Reporter: bgamari | Owner: bgamari Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.3 Resolution: | Keywords: Operating System: Linux | Architecture: arm Type of failure: Incorrect result | Test Case: T8726 at runtime | Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hvr): More trimmed down repro-case: {{{#!hs {-# LANGUAGE MagicHash #-} {-# OPTIONS_GHC -O0 #-} import GHC.Integer.GMP.Internals import GHC.Exts main :: IO () main = do print (x, isValidInteger x) print (y, isValidInteger y) print (z, isValidInteger z) -- reports (-2,False) on 32bit where z = x + y x = 0x0ffffffffffffffffffffffff :: Integer -- 3 limbs y = -0x1000000000000000000000001 :: Integer -- 4 limbs isValidInteger i = isTrue# (isValidInteger# i) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11296#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler