Propagate representation: anything*double => double; -double => double

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 358256cbf2f4fc2ddd6253a910d55013f0eb305b..3cd1036c0ebe4c96059ef8d9610db12b7442dbb9 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6190,6 +6190,9 @@ void HGraphBuilder::VisitSub(UnaryOperation* expr) {
     info = TypeInfo::Unknown();
   }
   Representation rep = ToRepresentation(info);
+  if (value->representation().IsDouble()) {
+    rep = Representation::Double();
+  }
   TraceRepresentation(expr->op(), info, instr, rep);
   instr->AssumeRepresentation(rep);
   return ast_context()->ReturnInstruction(instr, expr->id());
@@ -6522,6 +6525,11 @@ HInstruction* HGraphBuilder::BuildBinaryOperation(BinaryOperation* expr,
   if (instr->IsBitwiseBinaryOperation() && rep.IsDouble()) {
     rep = Representation::Integer32();
   }
+  if (expr->op() == Token::MUL &&
+      (left->representation().IsDouble() ||
+       right->representation().IsDouble())) {
+    rep = Representation::Double();
+  }
   TraceRepresentation(expr->op(), info, instr, rep);
   instr->AssumeRepresentation(rep);
   return instr;