2011/4/29 Stefan Dösinger <stefandoesinger@gmx.at>:

+    shader_addline(buffer, "TEMP TB;\n");

Which shader instruction uses this? Afair vertex shaders should only use TA,

but there's no proper infrastructure that manages that.

AFAICS, TB could get used in shader_hw_pow():

...
   shader_arb_get_src_param(ins, &ins->src[1], 1, src1);
...

where the '1' in the third argument means that
shader_arb_get_src_param() is allowed to use TB as temporary storage.
There may be other pieces of code with the same assumption, I didn't
look deeper.