#8871: No-op assignment I64[BaseReg + 784] = I64[BaseReg + 784]; is generated into optimized Cmm -------------------------------------+------------------------------------ Reporter: kgardas | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: Other | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by kgardas): Replying to [comment:1 simonpj]:
Are you using -O? Can you give your command line and output of `-ddump- cmm`?
Yes, see the command-line and also see attached files. BTW, I'm able to also reproduce this on PPC 32bit as I wrote. This is by using my simplified example above: {{{ $ grep "I64" T7507d_64-O-ppc.opt-cmm|grep Base I64[BaseReg + 784] = _s317::I64; I64[BaseReg + 784] = _s31d::I64; I64[BaseReg + 784] = 1 :: W64; I64[BaseReg + 784] = I64[BaseReg + 784]; I64[Hp - 4] = I64[BaseReg + 784]; I64[Sp - 8] = I64[BaseReg + 784]; }}} you see the line in the middle of grep... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8871#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler