Initial Subzero WASM prototype.

src/IceCfg.cpp

Index: src/IceCfg.cpp
diff --git a/src/IceCfg.cpp b/src/IceCfg.cpp
index e97eebfb8856037e04b3675d67dae4723ab975ec..a313a411d163de3c07e4ed8167cf7b4992ed7250 100644
--- a/src/IceCfg.cpp
+++ b/src/IceCfg.cpp
@@ -227,6 +227,22 @@ void Cfg::translate() {
     getContext()->dumpTimers();
 }
 
+void Cfg::fixPhiNodes() {
+  for (auto *Node : Nodes) {
+    // Fix all the phi edges since WASM can't tell how to make them correctly at
+    // the beginning.
+    assert(Node);
+    const auto InEdges = Node->getInEdges();

[Jim Stichnoth, 2016/03/29 17:49:57]

Should this be "const auto &" ?  I don't know.  getInEdges() returns a ref, and
I'm not sure whether you're accidentally making a copy here.

[Eric Holk, 2016/03/29 22:58:07]

Done.

+    for (auto &Inst : Node->getPhis()) {
+      auto Phi = llvm::cast<InstPhi>(&Inst);

[Jim Stichnoth, 2016/03/29 17:49:57]

auto *

[Eric Holk, 2016/03/29 22:58:07]

Done.

+      assert(Phi);
+      for (SizeT i = 0; i < InEdges.size(); ++i) {
+        Phi->setLabel(i, InEdges[i]);
+      }
+    }
+  }
+}
+
 void Cfg::computeInOutEdges() {
   // Compute the out-edges.
   for (CfgNode *Node : Nodes)
@@ -384,7 +400,8 @@ void Cfg::reorderNodes() {
       // in-edge if the predecessor node was contracted). If this changes in
       // the future, rethink the strategy.
       assert(Node->getInEdges().size() >= 1);
-      assert(Node->getOutEdges().size() == 1);
+      assert(Node->getOutEdges().size() == 1 ||
+             Node->getOutEdges()[0] == Node->getOutEdges()[1]);
 
       // If it's a (non-critical) edge where the successor has a single
       // in-edge, then place it before the successor.