Optimize call_ref+table.get => call_indirect (#4207)

Rather than load from the table and call that reference, call using the table.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/passes/OptimizeInstructions.cpp b/src/passes/OptimizeInstructions.cpp
index cb656ceaf..3153af200 100644
--- a/src/passes/OptimizeInstructions.cpp
+++ b/src/passes/OptimizeInstructions.cpp
@@ -1190,6 +1190,19 @@ struct OptimizeInstructions
       return;
     }
 
+    if (auto* get = curr->target->dynCast<TableGet>()) {
+      // (call_ref ..args.. (table.get $table (index))
+      //   =>
+      // (call_indirect $table ..args.. (index))
+      replaceCurrent(Builder(*getModule())
+                       .makeCallIndirect(get->table,
+                                         get->index,
+                                         curr->operands,
+                                         get->type.getHeapType().getSignature(),
+                                         curr->isReturn));
+      return;
+    }
+
     auto features = getModule()->features;
 
     // It is possible the target is not a function reference, but we can infer