#10062: Codegen on sequential FFI calls is not very good -------------------------------------+------------------------------------- Reporter: chadaustin | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 (CodeGen) | Keywords: Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: Runtime | Test Case: performance bug | Blocking: Blocked By: | Differential Revisions: Related Tickets: | -------------------------------------+------------------------------------- Comment (by svenpanne): A quick remark regarding "xorq %rax,%rax" vs. "movb $0,%al": I would recommend the xorq variant, we had very bad experiences with data dependencies between partially written registers in the v8 JavaScript JIT. Intel CPUs have funny performance characteristics, and these vary vastly between architectures and even releases of the same architecture. :-/ No need to repeat the pain in GHC... -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10062#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler