Refine stack slot interval weight computation.

[oota-llvm.git] / lib / CodeGen / README.txt

diff --git a/lib/CodeGen/README.txt b/lib/CodeGen/README.txt
index 8bd9a7af0d00dc649113f5296de51b4148f3eef6..a66fc9dcdccd555575118e3302bc7214adf8e6b9 100644 (file)
--- a/lib/CodeGen/README.txt
+++ b/lib/CodeGen/README.txt
@@ -151,13 +151,6 @@ an example.
 
 //===---------------------------------------------------------------------===//
 
-Instead of unconditionally inserting a null initializer for every GC root when
-Collector::InitRoots is set, the collector infrastructure should get a little
-bit smarter and perform a trivial DSE of the initial basic block up to the
-first safe point.
-
-//===---------------------------------------------------------------------===//
-
 With a copying garbage collector, derived pointers must not be retained across
 collector safe points; the collector could move the objects and invalidate the
 derived pointer. This is bad enough in the first place, but safe points can
@@ -186,3 +179,21 @@ work.
 
 The ocaml frametable structure supports liveness information. It would be good
 to support it.
+
+//===---------------------------------------------------------------------===//
+
+The FIXME in ComputeCommonTailLength in BranchFolding.cpp needs to be
+revisited. The check is there to work around a misuse of directives in inline
+assembly.
+
+//===---------------------------------------------------------------------===//
+
+It would be good to detect collector/target compatibility instead of silently
+doing the wrong thing.
+
+//===---------------------------------------------------------------------===//
+
+It would be really nice to be able to write patterns in .td files for copies,
+which would eliminate a bunch of explicit predicates on them (e.g. no side 
+effects).  Once this is in place, it would be even better to have tblgen 
+synthesize the various copy insertion/inspection methods in TargetInstrInfo.