https://bugs.freedesktop.org/show_bug.cgi?id=30684
--- Comment #12 from Marek Olšák maraeo@gmail.com 2010-12-01 10:28:11 PST --- I've just had a look at st/vega source code and found a shader which can't run on DX9-class hardware, like r500 and nv40. The shader in question is "convolution_asm" in asm_filters.h. The presence of ARL makes it require DX10-class hardware but the loop and break instructions are not nice either (not supported in shader model 2.0).