I have seen people use heart-rendering.
The concern was unwarranted, however, for the company commander ordered, "Ready! Aim! Fire!" and a dozen muskets split the crisp December air with a thunderous volley. In the hushed silence that followed, a lone Tiger broke ranks, ran up to one body, and gently held and caressed it. "It was heart-rendering," a correspondent wrote, "to see the poor brother's agony." Wheat, the only many in the division who was excused from attending the execution, broke down and cried in his tent at hearing the discharge of muskets. [The News-Star (Monroe, Louisiana), December 23, 2011, page 28]
Is there a usage like that? Is it used wrongly for heartrending?