#10370: Compile time regression in OpenGLRaw -------------------------------------+------------------------------------- Reporter: michalt | Owner: Type: bug | Status: new Priority: normal | Milestone: 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 michalt): I've had another quick look at this and compiled profiled GHC with addition of `{-# OPTIONS_GHC -fprof-auto #-}` to simplCore/Simplify.hs. The results are interesting: {{{ Sun May 3 17:33 2015 Time and Allocation Profiling Report (Final) ghc +RTS -hc -L100 -p -RTS [...] Graphics.Rendering.OpenGL.Raw.Functions total time = 42.38 secs (42385 ticks @ 1000 us, 1 processor) total alloc = 65,222,063,200 bytes (excludes profiling overheads) COST CENTRE MODULE %time %alloc tc_rn_src_decls TcRnDriver 15.1 10.4 completeCall.(...) Simplify 9.5 22.0 simplCast.add_coerce.arg' Simplify 9.1 21.8 pprNativeCode AsmCodeGen 4.2 3.2 Parser HscMain 3.3 4.2 RegAlloc AsmCodeGen 3.0 2.7 regLiveness AsmCodeGen 2.5 2.0 simplLam Simplify 2.5 1.3 OccAnal SimplCore 2.5 1.8 StgCmm HscMain 2.3 1.2 CallArity SimplCore 2.2 3.4 FloatOutwards SimplCore 1.7 1.1 sink CmmPipeline 1.7 1.1 simplAlts Simplify 1.5 0.8 genMachCode AsmCodeGen 1.5 0.9 deSugar HscMain 1.5 1.3 simplAlt Simplify 1.4 0.7 simplUnfolding Simplify 1.3 0.8 layoutStack CmmPipeline 1.2 0.9 completeCall.info Simplify 1.2 0.6 completeBind Simplify 1.2 0.6 NativeCodeGen CodeOutput 1.2 0.8 rebuildCall Simplify 1.1 1.0 Simplify SimplCore 1.1 0.0 }}} Looking at git blame the Simplify.simplCast didn't change much recently... Next week I'll try to have a look at Core generated by 7.8.4 and HEAD (maybe some stage before simplifier generates something weird?). -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10370#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler