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| author | Andreas Klebinger <klebinger.andreas@gmx.at> | 2019-10-20 02:30:01 +0200 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-10-23 05:59:04 -0400 |
| commit | 6beea836094383eea96b15e526f31b5426aea630 (patch) | |
| tree | eedb44be3fa4f86d085f3cfa2bb905b13cefccf4 /compiler/main/SysTools/Tasks.hs | |
| parent | 9c1f0f7c384eb2e38911b9a9b083ecda0970a060 (diff) | |
| download | haskell-6beea836094383eea96b15e526f31b5426aea630.tar.gz | |
Make dynflag argument for withTiming pure.
19 times out of 20 we already have dynflags in scope.
We could just always use `return dflags`. But this is in fact not free.
When looking at some STG code I noticed that we always allocate a
closure for this expression in the heap. Clearly a waste in these cases.
For the other cases we can either just modify the callsite to
get dynflags or use the _D variants of withTiming I added which
will use getDynFlags under the hood.
Diffstat (limited to 'compiler/main/SysTools/Tasks.hs')
| -rw-r--r-- | compiler/main/SysTools/Tasks.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/main/SysTools/Tasks.hs b/compiler/main/SysTools/Tasks.hs index 838ab64717..5b0cb1cfa2 100644 --- a/compiler/main/SysTools/Tasks.hs +++ b/compiler/main/SysTools/Tasks.hs @@ -371,4 +371,4 @@ touch dflags purpose arg = traceToolCommand dflags "touch" $ -- to run GHC with @-v2@ or @-ddump-timings@. traceToolCommand :: DynFlags -> String -> IO a -> IO a traceToolCommand dflags tool = withTiming - (return dflags) (text $ "systool:" ++ tool) (const ()) + dflags (text $ "systool:" ++ tool) (const ()) |