src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir.aarch64/src/org/graalvm/compiler/lir/aarch64/AArch64SignExtendOp.java

*** 52,59 ****
  
      @Override
      public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
          Register result = asRegister(resultValue);
          Register input = asRegister(inputValue);
!         masm.sxt(toBits, fromBits, result, input);
      }
  }
--- 52,59 ----
  
      @Override
      public void emitCode(CompilationResultBuilder crb, AArch64MacroAssembler masm) {
          Register result = asRegister(resultValue);
          Register input = asRegister(inputValue);
!         masm.sxt(toBits <= 32 ? 32 : 64, fromBits, result, input);
      }
  }