Repository : ssh://darcs.haskell.org//srv/darcs/ghc On branch : master
http://hackage.haskell.org/trac/ghc/changeset/d3128bfc286002862e916296629a22f1ce987e4e >--------------------------------------------------------------- commit d3128bfc286002862e916296629a22f1ce987e4e Author: Edward Z. Yang <[email protected]> Date: Mon Sep 17 18:28:49 2012 +0200 Partially fix #367 by adding HpLim checks to entry with -fno-omit-yields. The current fix is relatively dumb as far as where to add HpLim checks: it will always perform a check unless we know that we're returning from a closure or we are doing a non let-no-escape case analysis. The performance impact on the nofib suite looks like this: Min +5.7% -0.0% -6.5% -6.4% -50.0% Max +6.3% +5.8% +5.0% +5.5% +0.8% Geometric Mean +6.2% +0.1% +0.5% +0.5% -0.8% Overall, the executable bloat is the biggest problem, so we keep the old omit-yields optimization on by default. Remember that if you need an interruptibility guarantee, you need to recompile all of your libraries with -fno-omit-yields. A better fix would involve only inserting the yields necessary to break loops; this is left as future work. Signed-off-by: Edward Z. Yang <[email protected]> compiler/codeGen/StgCmmExpr.hs | 4 +-- compiler/codeGen/StgCmmHeap.hs | 57 ++++++++++++++++++++++++++-------------- compiler/main/DynFlags.hs | 4 +++ docs/users_guide/using.xml | 18 ++++++++++++ 4 files changed, 60 insertions(+), 23 deletions(-) Diff suppressed because of size. To see it, use: git show d3128bfc286002862e916296629a22f1ce987e4e _______________________________________________ Cvs-ghc mailing list [email protected] http://www.haskell.org/mailman/listinfo/cvs-ghc
