[GHC] #11064: Call Arity has the trivial application case wrong
#11064: Call Arity has the trivial application case wrong -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- In `e x`, the result of `x` is not shared in contrast to `e (f x)`, where CorePrep will turn it into `let y = f x in e x`. So in {{{ let f = ... in e (f x) }}} we know that f is called at most once, but in {{{ let f = ... in e f }}} we do not know that. Previously Call Arity would assume that in `e x`, `x` is evaluated at most once. This rarely would make a difference (the argument `x` is analized with an incoming arity of 0, so no eta-expansion would be done anyways), but of course this should still be fixed. I just validated a patch and will push shortly. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11064 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11064: Call Arity has the trivial application case wrong
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Reporter: nomeata | Owner: nomeata
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.10.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Joachim Breitner
#11064: Call Arity has the trivial application case wrong -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: bug | Status: merge Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by nomeata): * status: new => merge Comment: Pushed to master. I’d like to see this in 7.10.3, if possible. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11064#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11064: Call Arity has the trivial application case wrong -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by nomeata): * milestone: => 7.10.3 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11064#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11064: Call Arity has the trivial application case wrong -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: bug | Status: merge Priority: normal | Milestone: 7.10.3 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Is there some way we could formulate a test for this? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11064#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#11064: Call Arity has the trivial application case wrong -------------------------------------+------------------------------------- Reporter: nomeata | Owner: nomeata Type: bug | Status: closed Priority: normal | Milestone: 7.10.3 Component: Compiler | Version: 7.10.2 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: merge => closed * resolution: => fixed -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11064#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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