Issues · Glasgow Haskell Compiler / GHC · GitLab

Word type to Double or Float conversions are slower than Int conversions

#2269 · opened May 07, 2008 by dons 8.0.1 0 Plow Trac import feature request newcomer rules runtime perf
- 16
updated Jul 07, 2019
Needless reboxing of values when returning from a tight loop

#2289 · opened May 17, 2008 by dons 8.0.1 0 CPR analysis Plow Trac import bug runtime perf
- 38
updated May 18, 2020
MutableByteArray# is slower than Addr#

#2374 · opened Jun 18, 2008 by dolio 8.0.1 0 NCG backend Plow Trac import bug runtime perf
- 14
updated Jul 07, 2019
GHC's GC default heap growth strategy is not as good as other runtimes

#3061 · opened Mar 03, 2009 by dons 8.0.1 0 Plow RTS Trac import bug runtime perf
- 12
updated Jul 07, 2019
New codegen: allocate large objects using allocateLocal()

#3462 · opened Aug 25, 2009 by Simon Marlow 8.0.1 3 Plow RTS Trac import runtime perf task
- 6
updated Jul 07, 2019
Comparisons against minBound/maxBound not optimised for (Int|Word)(8|16|32)

#3744 · opened Dec 11, 2009 by rl@cse.unsw.edu.au 8.0.1 3 Plow Trac import bug feature request runtime perf
- 14
updated Jul 07, 2019
Improve join point inlining

#3755 · opened Dec 15, 2009 by Simon Peyton Jones 8.0.1 3 Plow Trac import runtime perf task
- 7
updated Jul 07, 2019
Improve inlining for local functions

#3781 · opened Dec 23, 2009 by Simon Peyton Jones 8.0.1 0 Plow Trac import bug runtime perf
- 9
updated Jul 07, 2019
UNPACK doesn't unbox data families

#3990 · opened Apr 14, 2010 by rl@cse.unsw.edu.au 8.0.1 3 Plow Trac import bug runtime perf
- CLOSED
- 16
updated Jul 07, 2019
Strict constructor fields inspected in loop

#4081 · opened May 19, 2010 by rl@cse.unsw.edu.au 8.0.1 3 Plow Trac import bug runtime perf
- 21
updated Jul 07, 2019
Primitive constant unfolding

#4101 · opened May 28, 2010 by malosh 8.0.1 3 Plow Trac import bug runtime perf
- 17
updated Jul 07, 2019
Optimisations give bad core for foldl' (flip seq) ()

#4301 · opened Sep 10, 2010 by daniel.is.fischer 8.0.1 3 Plow Trac import bug runtime perf
- 8
updated Jul 07, 2019
LLVM compiles Updates.cmm badly

#4308 · opened Sep 14, 2010 by dterei 8.0.1 3 LLVM backend Plow Trac import bug runtime perf
- 16
updated Jul 07, 2019
Another SpecConstr infelicity

#4945 · opened Feb 03, 2011 by batterseapower 8.0.1 5 Pnormal Trac import bug runtime perf
- 14
updated Jul 07, 2019
Misfeature of Cmm optimiser: no way to extract a branch of expression into a separate statement

#5171 · opened May 06, 2011 by rtvd 8.0.1 3 Plow Trac import feature request runtime perf
- 5
updated Jul 07, 2019
Inlined functions aren't fully specialised

#5298 · opened Jul 04, 2011 by reinerp 8.0.1 3 Plow Trac import bug runtime perf
- 8
updated Jul 07, 2019
Polymorphic instances aren't automatically specialised

#5326 · opened Jul 15, 2011 by reinerp 8.0.1 3 Plow Trac import bug runtime perf specialisation
- 5
updated Jul 07, 2019
Slow 64-bit primops on 32 bit system

#5444 · opened Aug 31, 2011 by Khudyakov 8.0.1 5 Pnormal Trac import bug runtime perf
- 5
updated Jul 07, 2019
LLVM: Improve alias analysis / performance

#5567 · opened Oct 18, 2011 by dterei 8.0.1 5 LLVM backend Pnormal Trac import runtime perf task
- 20
updated Jul 07, 2019
Performance regression 7.0 -> 7.2 (still in 7.4)

#5954 · opened Mar 20, 2012 by Simon Marlow 8.0.1 5 Pnormal Trac import bug runtime perf
- 14
updated Jul 07, 2019
Register allocators can't handle non-uniform register sets

#7063 · opened Jul 09, 2012 by Simon Marlow 8.0.1 5 NCG backend Pnormal Trac import bug runtime perf
- 3
updated Jul 07, 2019
Specialise INLINE functions

#7283 · opened Sep 30, 2012 by rl@cse.unsw.edu.au 8.0.1 5 Pnormal Trac import feature request runtime perf
- 5
updated Jul 07, 2019
Allow CAFs kept reachable by FFI to be forcibly made unreachable for GC

#7300 · opened Oct 05, 2012 by absence 8.0.1 5 FFI Pnormal RTS Trac import feature request runtime perf
- 7
updated Jul 07, 2019
Identical alts/bad divInt# code

#7378 · opened Oct 31, 2012 by daniel.is.fischer 8.0.1 5 Pnormal Trac import bug runtime perf
- 8
updated Jul 07, 2019
Room for GHC runtime improvement >~5%, inlining related

#7511 · opened Dec 19, 2012 by danielv 8.0.1 5 Pnormal Trac import bug runtime perf
- 8
updated Jul 07, 2019
GHC doesn't optimize (strict) composition with id

#7542 · opened Jan 01, 2013 by shachaf 8.0.1 5 Arity and eta expansion Pnormal Trac import bug runtime perf
- 26
updated Feb 26, 2020
UNPACK polymorphic fields

#7647 · opened Feb 01, 2013 by liyang 8.0.1 5 Pnormal Trac import feature request runtime perf
- 14
updated Jul 07, 2019
bad alignment in code gen yields substantial perf issue

#8279 · opened Sep 12, 2013 by Carter Schonwald 8.0.1 5 Pnormal Trac import bug runtime perf
- 29
updated Jul 07, 2019
Strange slowness when using async library with FFI callbacks

#8623 · opened Dec 22, 2013 by JohnWiegley 8.0.1 5 Pnormal RTS Trac import bug runtime perf
- 15
updated Jul 07, 2019
Global big object heap allocator lock causes contention

#8732 · opened Feb 04, 2014 by tibbe 8.0.1 5 Pnormal RTS Trac import bug runtime perf
- 18
updated Jul 07, 2019
I/O manager causes unnecessary syscalls in send/recv loops

#8733 · opened Feb 04, 2014 by tibbe 8.0.1 5 Pnormal RTS Trac import bug runtime perf
- 23
updated Jul 07, 2019
Improve GHC.Event.IntTable performance

#8793 · opened Feb 16, 2014 by cdk 8.0.1 5 Pnormal Trac import core libraries runtime perf task
- CLOSED
- 29
updated Jul 07, 2019
Constant-folding regression wrt `clearBit (bit 0) 0 `

#8832 · opened Mar 01, 2014 by Herbert Valerio Riedel 8.0.1 7 Phigh Trac import bug core libraries runtime perf
- CLOSED
- 23
updated Jul 07, 2019
Profiling binary consumes CPU even when idle on Linux.

#9105 · opened May 13, 2014 by robinp 8.0.1 5 Pnormal RTS Trac import bug runtime perf
- CLOSED
- 7
updated Jul 07, 2019
ghc does not expose branchless max/min operations as primops

#9251 · opened Jun 30, 2014 by Carter Schonwald 8.0.1 5 Pnormal Trac import newcomer runtime perf task
- 29
updated Apr 29, 2020
implement more arithmetic operations natively in the LLVM backend

#9430 · opened Aug 10, 2014 by rwbarton 8.0.1 5 LLVM backend Pnormal Trac import feature request runtime perf
- CLOSED
- 12
updated Jul 07, 2019
Speed up Data.Char.isDigit

#9638 · opened Sep 26, 2014 by David Feuer 8.0.1 5 Pnormal Trac import core libraries feature request runtime perf
- CLOSED
- 12
updated Jul 07, 2019
Simplifer non-determinism leading to 8 fold difference in run time performance

#9646 · opened Sep 29, 2014 by erikd 8.0.1 5 Pnormal Trac import broken test bug runtime perf
- 25
updated Jul 07, 2019
Make quot/rem/div/mod with known divisors fast

#9786 · opened Nov 10, 2014 by David Feuer 8.0.1 5 Pnormal Trac import runtime perf task
- 4
updated Dec 26, 2020
map/coerce rule does not fire until the coercion is known

#9792 · opened Nov 11, 2014 by David Feuer 8.0.1 5 Pnormal Trac import bug core libraries runtime perf
- 14
updated Jul 07, 2019
Investigate rewriting `>>=` to `*>` or `>>` for appropriate types

#9797 · opened Nov 12, 2014 by David Feuer 8.0.1 5 Pnormal Trac import core libraries runtime perf task
- CLOSED
- 6
updated Jul 07, 2019
List.all does not fuse

#9848 · opened Nov 30, 2014 by klapaucius 8.0.1 5 Pnormal Trac import bug core libraries runtime perf
- CLOSED
- 8
updated Jul 07, 2019
Data.Array.Base.elems needlessly calls bounds.

#10014 · opened Jan 22, 2015 by Edward Kmett 8.0.1 5 Pnormal Trac import core libraries feature request runtime perf
- CLOSED
- 2
updated Jul 07, 2019
Regression in mapM_ performance

#10034 · opened Jan 27, 2015 by David Feuer 8.0.1 5 Pnormal Trac import bug core libraries runtime perf
- CLOSED
- 8
updated Jul 07, 2019
The Read Integer instance is too slow

#10067 · opened Feb 06, 2015 by redneb 8.0.1 5 Pnormal Trac import core libraries feature request runtime perf
- CLOSED
- 15
updated Jul 07, 2019
compiling huge HashSet hogs memory

#10289 · opened Apr 12, 2015 by zudov 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 11
updated Jul 07, 2019
Tuple constraint synonym led to asymptotic performance lossage

#10359 · opened Apr 28, 2015 by axch 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 9
updated Jul 07, 2019
slightly silly assembly for testing whether a Word# is 0##

#10677 · opened Jul 23, 2015 by rwbarton 8.0.1 3 Plow Trac import bug code generation newcomer runtime perf
- CLOSED
- 9
updated Jul 07, 2019
integer-gmp's runS seems unnecessarily expensive

#10678 · opened Jul 23, 2015 by rwbarton 8.0.1 5 Pnormal Trac import bug code generation runtime perf
- CLOSED
- 17
updated Jul 07, 2019
fannkuch-redux allocations increase by factor of 10000 between 7.4.2 and 7.6.3

#10717 · opened Jul 31, 2015 by Ben Gamari 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 8
updated Jul 07, 2019
Allow oneShot to work with unboxed types

#10744 · opened Aug 06, 2015 by takano-akio 8.0.1 5 Pnormal Trac import feature request runtime perf
- CLOSED
- 16
updated Jul 07, 2019
silly assembly for comparing Doubles

#10750 · opened Aug 07, 2015 by rwbarton 8.0.1 5 Pnormal Trac import bug code generation runtime perf
- CLOSED
- 6
updated Jul 07, 2019
performance regression involving minimum

#10788 · opened Aug 23, 2015 by rwbarton 8.0.1 5 Pnormal Trac import bug core libraries runtime perf
- CLOSED
- 14
updated Jul 07, 2019
Loopification does not trigger for IO even if it could

#11372 · opened Jan 07, 2016 by jscholl 8.0.1 5 Pnormal Trac import bug code generation runtime perf
- CLOSED
- 8
updated Jul 07, 2019
Stack check not optimized out even if it could be

#11533 · opened Feb 03, 2016 by jscholl 8.0.1 5 Pnormal Trac import bug code generation runtime perf
- CLOSED
- 3
updated Jul 07, 2019
Bytestring break failing rewrite to breakByte and failing to eliminate boxing/unboxing

#11688 · opened Mar 08, 2016 by Alex Biehl 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 16
updated Jul 07, 2019
ghc generates significant slower code

#11701 · opened Mar 11, 2016 by HuStmpHrrr 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 6
updated Jul 07, 2019
Don't desugar large lists with build

#11707 · opened Mar 14, 2016 by Ben Gamari 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 13
updated Jul 07, 2019
Fusion of a simple listArray call is very fragile

#11710 · opened Mar 15, 2016 by Ben Gamari 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 7
updated Jul 07, 2019
Performance Regression from 7.8.3 to 7.10.3

#11725 · opened Mar 20, 2016 by Dominic 8.0.1 5 Pnormal Trac import bug runtime perf
- CLOSED
- 10
updated Jul 07, 2019
Very large slowdown when using parallel garbage collector

#11783 · opened Apr 02, 2016 by luispedro 8.0.1 7 Phigh RTS Trac import bug runtime perf
- CLOSED
- 5
updated Jul 07, 2019
Performance issues with replicateM_

#11795 · opened Apr 06, 2016 by snoyberg 8.0.1 5 Pnormal Trac import bug core libraries runtime perf
- CLOSED
- 8
updated Jul 07, 2019