imageworks/OpenShadingLanguage — pull request #271 by lgritz (2013-07-10 17:14:58+00:00)
Title: filterwidth code gen bug when arg had no derivs -- wrong variable cleared

oops. Been there forever, but until I added aastep (implemented with filterwidth), apparently it was unusual to pass an arg to filterwidth that didn't have derivs (such as a constant), so never encountered the bug before.