#10491: Regression, simplifier explosion with Accelerate, cannot compile, increasing tick factor is not a workaround -------------------------------------+------------------------------------- Reporter: robertce | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.10.2 Component: Compiler | Version: 7.10.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by bgamari): George, what GHC version did you test `-fno-specialise` on? While yesterday I was able to confirm that `-fno-specialise` seemed to make no difference on a test machine running what should have been 7.10.1 I am now having trouble replicating this on my laptop. Unfortunately I no longer have access to the test environment on which I tested this yesterday but clearly something was inconsistent. I am now seeing on multiple machines that `-fno-specialise` indeed allows things to compile, {{{ $ ghc -V The Glorious Glasgow Haskell Compilation System, version 7.10.1 $$ time ghc Slice.hs -fforce-recomp -O2 -fno-specialise [1 of 1] Compiling Slice ( Slice.hs, Slice.o ) real 0m3.759s user 0m1.688s sys 0m0.044s $ time ghc Slice.hs -fforce-recomp -O2 [1 of 1] Compiling Slice ( Slice.hs, Slice.o ) ^C real 0m51.103s user 0m44.336s sys 0m0.948s }}} I am now looking at whether disabling only cross-module specialisation is enough to eliminate the blow-up. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10491#comment:27 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler