Fix folding for *.load_splat and table.fill (#1486)

Also remove default case from `ir-util.cc` so we get compile warnings in
the future.

Author: binji

src/ir-util.cc

@@ -171,6 +171,7 @@ ModuleContext::Arities ModuleContext::GetExprArity(const Expr& expr) const {
     case ExprType::MemoryFill:
     case ExprType::MemoryCopy:
     case ExprType::TableCopy:
+    case ExprType::TableFill:
       return { 3, 0 };
 
     case ExprType::AtomicLoad:
@@ -181,6 +182,7 @@ ModuleContext::Arities ModuleContext::GetExprArity(const Expr& expr) const {
     case ExprType::Unary:
     case ExprType::TableGet:
     case ExprType::RefIsNull:
+    case ExprType::LoadSplat:
       return { 1, 1 };
 
     case ExprType::Drop:
@@ -257,10 +259,5 @@ ModuleContext::Arities ModuleContext::GetExprArity(const Expr& expr) const {
 
     case ExprType::SimdShuffleOp:
       return { 2, 1 };
-
-    default:
-      fprintf(stderr, "bad expr type: %s\n", GetExprTypeName(expr));
-      assert(0);
-      return { 0, 0 };
   }
 }

test/roundtrip/fold-reference-types.txt

@@ -3,20 +3,47 @@
 
 (module
   (table $t 1 externref)
+  (elem declare func 0)
   (func
-    i32.const 0
-    i32.const 0
-    table.get $t
-    table.set $t
+    (local externref)
+
+    i32.const 0 table.get $t drop
+    i32.const 0 local.get 0 table.set $t
+    local.get 0 i32.const 0 table.grow $t drop
+    table.size $t drop
+    i32.const 0 local.get 0 i32.const 0 table.fill $t
+    ref.null extern drop
+    local.get 0 ref.is_null drop
+    ref.func 0 drop
   )
 )
 (;; STDOUT ;;;
 (module
   (type (;0;) (func))
   (func (;0;) (type 0)
+    (local externref)
+    (drop
+      (table.get 0
+        (i32.const 0)))
     (table.set 0
       (i32.const 0)
-      (table.get 0
-        (i32.const 0))))
-  (table (;0;) 1 externref))
+      (local.get 0))
+    (drop
+      (table.grow 0
+        (local.get 0)
+        (i32.const 0)))
+    (drop
+      (table.size 0))
+    (table.fill 0
+      (i32.const 0)
+      (local.get 0)
+      (i32.const 0))
+    (drop
+      (ref.null extern))
+    (drop
+      (ref.is_null (local.get 0)))
+    (drop
+      (ref.func 0)))
+  (table (;0;) 1 externref)
+  (elem (;0;) declare func 0))
 ;;; STDOUT ;;)