#15960: Using -g causes differences in generated core. -------------------------------------+------------------------------------- Reporter: AndreasK | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.3 Component: Compiler | Version: 8.6.2 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: -------------------------------------+------------------------------------- For nofib/shootout/fannkuch-redux: Normal results {{{
/e/ghc-8.6.1/bin/ghc.exe Main.hs -O2 -XBangPatterns -fforce-recomp -ddump-simpl -dsuppress-all -dsuppress-uniques | less ... Result size of Tidy Core = {terms: 2,747, types: 2,736, coercions: 100, joins: 50/73} ... }}}
{{{
/e/ghc-8.6.1/bin/ghc.exe Main.hs -O2 -XBangPatterns -fforce-recomp -ddump-simpl -dsuppress-all -dsuppress-uniques -g | less ... Result size of Tidy Core = {terms: 2,654, types: 2,557, coercions: 100, joins: 38/71} ... }}}
There are also structural differences in the generated code. I've hit the issue with a tree based on head as well so likely happening there as well. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15960 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler