Comment # 9
on bug 99349
from Gert Wollny
It turns out that in r600_shader.c:tgsi_split_constant the constants should be moved to the GPR range, but for large shaders this is not sufficient, since the temporary registers used there may be beyond 127 which is the limit for GPRs. tgsi_split_constant doesn't move all constants and if an operator uses the same constant as source more than once, then one of the instances of the constants is moved to a new address, and this may even be counter productive. Now to fix this bug, a partial workaround is in the repo I've given above, the patch changes the register handling to reserve a few registers in the low range and moves constants there if necessary. Note, however, that it also contains additional debugging output. However, for the instruction LRP TEMP[0].xyz, CONST[31].wwww, CONST[31].xyzz, TEMP[0].xyzz check_and_set_bank_swizzle still fails. (This is, by the way, one such case where tgsi_split_constant moves one of the instances of CONST[31] to another place.) I will try to correct tgsi_split_constant to not move the values around if they are originally from the same source and see whether this fixes the problem.
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