#8905: Function arguments are always spilled/reloaded if scrutinee is already in WHNF --------------------------------------------+------------------------------ Reporter: tibbe | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by tibbe): The register allocator doesn't tidy this up either: {{{ #!asm _c2wS: leaq block_c2my_info(%rip),%rax movq %rax,-40(%rbp) movq %r9,%rbx movq %r14,-32(%rbp) movq %rsi,-24(%rbp) movq %rdi,-16(%rbp) movq %r8,-8(%rbp) addq $-40,%rbp testq $7,%rbx jne _c2my }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8905#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler