[PATCH] D10971: WebAssembly: add some TODO

[JF Bastien]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL241513: WebAssembly: add some TODO (authored by jfb).

Changed prior to commit:
  http://reviews.llvm.org/D10971?vs=29124&id=29127#toc

Repository:
  rL LLVM

http://reviews.llvm.org/D10971

Files:
  llvm/trunk/lib/Target/WebAssembly/README.txt

Index: llvm/trunk/lib/Target/WebAssembly/README.txt
===================================================================
--- llvm/trunk/lib/Target/WebAssembly/README.txt
+++ llvm/trunk/lib/Target/WebAssembly/README.txt
@@ -12,4 +12,15 @@
   * https://github.com/WebAssembly/design/blob/master/AstSemantics.md
   * https://github.com/WebAssembly/design/blob/master/BinaryEncoding.md
 
+Interesting work that remains to be done:
+* Write a pass to restructurize irreducible control flow. This needs to be done
+  before register allocation to be efficient, because it may duplicate basic
+  blocks and WebAssembly performs register allocation at a whole-function
+  level. Note that LLVM's GPU code has such a pass, but it linearizes control
+  flow (e.g. both sides of branches execute and are masked) which is undesirable
+  for WebAssembly.
+* Basic relooper to expose control flow as an AST.
+* Figure out how to properly use MC for virtual ISAs. This may require some
+  refactoring of MC.
+
 //===---------------------------------------------------------------------===//


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