Teach phi translation to also look through bitcasts.

This fixes a regression introduced in d95cd364f0c049d6c1b8d78746d44c00ed2f69f2;
when regular expression translation looks through bitcasts but phi translation
doesn't, phi translation may fail to properly detect dependencies.

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index a08e61fbff..5efd4c5684 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -521,7 +521,10 @@ std::string JSWriter::getPhiCode(const BasicBlock *From, const BasicBlock *To) {
     // we found it
     const std::string &name = getJSName(P);
     assigns[name] = getAssign(P);
-    const Value *V = P->getIncomingValue(index);
+    // Get the operand, and strip pointer casts, since normal expression
+    // translation also strips pointer casts, and we want to see the same
+    // thing so that we can detect any resulting dependencies.
+    const Value *V = P->getIncomingValue(index)->stripPointerCasts();
     values[name] = V;
     std::string vname = getValueAsStr(V);
     if (const Instruction *VI = dyn_cast<const Instruction>(V)) {