| What | Removed | Added |
|---|---|---|
| CC | lil_tux@web.de |
Comment # 21
on bug 94900
from Heiko
Created attachment 125271 [details] [review] Simple workaround 'Fixes' the octodad trace for me. That stops sb from using fold_assoc to fold ADD_INT(ADD_INT(x, 1), 2) for scalar registers. Problem is, that sb currently optimizes away the loop counter node, due to optimizing its reference out of another node and marking it as unused/dead, finally nuking the counter increment as well. Thus the loop break condition is never met and the gpu hangs due to an endless loop, and finally, gets reset. If mesa is compiled in debug mode, sb checks the shader it would put out and fails assertions with unset registers... just being the loop counter of the three loops in the octodad case (shader 70). On a side note, this scenario might be already known for phi nodes, as the comment in sb_expr.cpp:expr_handler::fold() mentions similar issues...
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