#15019: Fix performance regressions from #14737 -------------------------------------+------------------------------------- Reporter: tdammers | Owner: tdammers Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #14737 | Differential Rev(s): phab:D4568 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Wow. With this change I see {{{ Unexpected stat failures: /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T5837.run T5837 [stat too good] (normal) (-7.9%) /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T5321FD.run T5321FD [stat too good] (normal) (-12.5%) /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T12425.run T12425 [stat too good] (optasm) (-9.5%) /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T9020.run T9020 [stat too good] (optasm) (-32.5%) /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T12707.run T12707 [stat too good] (normal) (-8.7%) /tmp/ghctest-c0sci53m/test spaces/./perf/compiler/T12227.run T12227 [stat not good enough] (normal) (+660%) }}} Clearly something is going pear shaped in `T12227` but the other numbers look fantastic for such a small change! Do you see this too? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15019#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler