2 files changed, 16 insertions, 0 deletions
diff --git a/js/src/jit/shared/LIR-shared.h b/js/src/jit/shared/LIR-shared.h
index 62dc574b6..f97dc1534 100644
--- a/js/src/jit/shared/LIR-shared.h
+++ b/js/src/jit/shared/LIR-shared.h
@@ -7851,6 +7851,21 @@ class LIsObjectAndBranch : public LControlInstructionHelper<2, BOX_PIECES, 0>
     }
 };
 
+class LIsNullOrUndefined : public LInstructionHelper<1, BOX_PIECES, 0>
+{
+  public:
+    LIR_HEADER(IsNullOrUndefined);
+    static const size_t Input = 0;
+
+    explicit LIsNullOrUndefined(const LBoxAllocation& input) {
+        setBoxOperand(Input, input);
+    }
+
+    MIsNullOrUndefined* mir() const {
+        return mir_->toIsNullOrUndefined();
+    }
+};
+
 class LHasClass : public LInstructionHelper<1, 1, 0>
 {
   public:
diff --git a/js/src/jit/shared/LOpcodes-shared.h b/js/src/jit/shared/LOpcodes-shared.h
index d0651af1d..7f4cd770a 100644
--- a/js/src/jit/shared/LOpcodes-shared.h
+++ b/js/src/jit/shared/LOpcodes-shared.h
@@ -385,6 +385,7 @@
     _(IsConstructor)                \
     _(IsObject)                     \
     _(IsObjectAndBranch)            \
+    _(IsNullOrUndefined)            \
     _(HasClass)                     \
     _(GuardToClass)                 \
     _(RecompileCheck)               \