X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2Fcmm-notes;h=98c2e836994c8e05990c47205af7de371a4d2ff2;hp=e787f18b17bb5af22b0a00be5f5df81d92c53d04;hb=d25676a6b1c42495702048b6ca6f26ebd15205d8;hpb=dcc7b25a12eb07285a0b717b43ce62feb1f7dae1

diff --git a/compiler/cmm/cmm-notes b/compiler/cmm/cmm-notes
index e787f18..98c2e83 100644
--- a/compiler/cmm/cmm-notes
+++ b/compiler/cmm/cmm-notes
@@ -1,3 +1,45 @@
+More notes (June 11)
+~~~~~~~~~~~~~~~~~~~~
+* Kill dead code assignArguments, argumentsSize in CmmCallConv.
+  Bake in ByteOff to ParamLocation and ArgumentFormat
+  CmmActuals -> [CmmActual]  similary CmmFormals
+
+* Possible refactoring: Nuke AGraph in favour of 
+      mkIfThenElse :: Expr -> Graph -> Graph -> FCode Graph
+  or even
+      mkIfThenElse :: HasUniques m => Expr -> Graph -> Graph -> m Graph
+  (Remmber that the .cmm file parser must use this function)
+
+  or parameterise FCode over its envt; the CgState part seem useful for both
+
+* Move top and tail calls to runCmmContFlowOpts from HscMain to CmmCps.cpsTop
+  (and rename the latter!)
+
+* "Remove redundant reloads" in CmmSpillReload should be redundant; since
+  insertLateReloads is now gone, every reload is reloading a live variable.
+  Test and nuke.
+
+* Sink and inline S(RegSlot(x)) = e in precisely the same way that we
+  sink and inline x = e
+
+* Stack layout is very like register assignment: find non-conflicting assigments.
+  In particular we can use colouring or linear scan (etc).
+
+  We'd fine-grain interference (on a word by word basis) to get maximum overlap.
+  But that may make very big interference graphs.  So linear scan might be
+  more attactive.
+
+  NB: linear scan does on-the-fly live range splitting.
+
+* When stubbing dead slots be careful not to write into an area that
+  overlaps with an area that's in use.  So stubbing needs to *follow* 
+  stack layout.
+
+
+More notes (May 11)
+~~~~~~~~~~~~~~~~~~~
+In CmmNode, consider spliting CmmCall into two: call and jump
+
 Notes on new codegen (Aug 10)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~