X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fmain%2FDynFlags.hs;h=be0212e744d2685b29e88b4f51ea18cd7d82b8c9;hp=d3019eef64840047bab4e7f0ae3098d5772e7539;hb=842e9d6628a27cf1f420d53f6a5901935dc50c54;hpb=bfd0c33d39619b580520e2d6e43d306380393ea6

diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index d3019ee..be0212e 100644
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -1160,7 +1160,8 @@ dynamic_flags = [
   ,  ( "ddump-mod-cycles",     	 setDumpFlag Opt_D_dump_mod_cycles)
   ,  ( "ddump-view-pattern-commoning", setDumpFlag Opt_D_dump_view_pattern_commoning)
   ,  ( "ddump-to-file",          setDumpFlag Opt_DumpToFile)
-  ,  ( "ddump-hi-diffs",         NoArg (setDynFlag Opt_D_dump_hi_diffs))
+  ,  ( "ddump-hi-diffs",         setDumpFlag Opt_D_dump_hi_diffs)
+
   ,  ( "dcore-lint",       	 NoArg (setDynFlag Opt_DoCoreLinting))
   ,  ( "dstg-lint",        	 NoArg (setDynFlag Opt_DoStgLinting))
   ,  ( "dcmm-lint",		 NoArg (setDynFlag Opt_DoCmmLinting))
@@ -1186,6 +1187,7 @@ dynamic_flags = [
 	------ Optimisation flags ------------------------------------------
   ,  ( "O"	, NoArg (upd (setOptLevel 1)))
   ,  ( "Onot"	, NoArg (upd (setOptLevel 0))) -- deprecated
+  ,  ( "Odph"   , NoArg (upd setDPHOpt))
   ,  ( "O"	, OptIntSuffix (\mb_n -> upd (setOptLevel (mb_n `orElse` 1))))
 		-- If the number is missing, use 1
 
@@ -1484,9 +1486,16 @@ unSetDynFlag f = upd (\dfs -> dopt_unset dfs f)
 --------------------------
 setDumpFlag :: DynFlag -> OptKind DynP
 setDumpFlag dump_flag 
-  = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
+  | force_recomp   = NoArg (setDynFlag Opt_ForceRecomp >> setDynFlag dump_flag)
+  | otherwise      = NoArg (setDynFlag dump_flag)
+  where
 	-- Whenver we -ddump, switch off the recompilation checker,
 	-- else you don't see the dump!
+        -- However, certain dumpy-things are really interested in what's going
+        -- on during recompilation checking, so in those cases we
+        -- don't want to turn it off.
+   force_recomp = dump_flag `notElem` [Opt_D_dump_if_trace, 
+                                       Opt_D_dump_hi_diffs]
 
 setVerboseCore2Core :: DynP ()
 setVerboseCore2Core = do setDynFlag Opt_ForceRecomp
@@ -1581,6 +1590,24 @@ setOptLevel n dflags
 	= updOptLevel n dflags
 
 
+-- -Odph is equivalent to
+--
+--    -O2                               optimise as much as possible
+--    -fno-method-sharing               sharing specialisation defeats fusion
+--                                      sometimes
+--    -fdicts-cheap                     always inline dictionaries
+--    -fmax-simplifier-iterations20     this is necessary sometimes
+--    -fno-spec-constr-threshold        run SpecConstr even for big loops
+--
+setDPHOpt :: DynFlags -> DynFlags
+setDPHOpt dflags = setOptLevel 2 (dflags { maxSimplIterations  = 20
+                                         , specConstrThreshold = Nothing
+                                         })
+                   `dopt_set`   Opt_DictsCheap
+                   `dopt_unset` Opt_MethodSharing
+
+
+
 setMainIs :: String -> DynP ()
 setMainIs arg
   | not (null main_fn) && isLower (head main_fn)