#14619: Output value of program changes upon compiling with -O optimizations -------------------------------------+------------------------------------- Reporter: sheaf | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.4.1 Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Windows | Architecture: x86_64 Type of failure: Incorrect result | (amd64) at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by carter): 1) phyx- none of these register excerpts mention xmm0 .... whys that? the set of caller saved registers is xmm0 -xmm5 ... but here the exceprts only work on xmm1-xmm6! (is there some off by one error in the register abi encoding stuff ?) 2) i think we can probably assume / presume that the code at fault likely lies somewhere in https://github.com/ghc/ghc/blob/ghc-8.2/compiler/nativeGen/X86/CodeGen.hs#L2... (perma link https://github.com/ghc/ghc/blob/4d99a665986f66f403ad49f7d91a1fc069870274/com... ) or something related in register/abi stuff -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14619#comment:28 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler