Don't mark MGetFirstDollarIndex as movable.

2026-05-26 13:58:49 +00:00 · 2018-10-31 17:30:52 +01:00
parent 5c9fd5c5c6
commit c554052ddd
1 changed files with 4 additions and 1 deletions
@@ -8272,7 +8272,10 @@ class MGetFirstDollarIndex
      : MUnaryInstruction(str)
    {
        setResultType(MIRType::Int32);
-        setMovable();
+
+        // Codegen assumes string length > 0 but that's not guaranteed in RegExp.
+        // Don't allow LICM to move this.
+        MOZ_ASSERT(!isMovable());
    }

  public: