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i965/fs: Add a comment about about an implementation detail.

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I was going to fix the code above like the previous commit, but we already
had that covered (otherwise all our uniform access would have been broken,
unlike just pull constants).

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt 2013-03-06 17:12:28 -08:00
parent f10f5e4980
commit c588cd2031
1 changed files with 4 additions and 0 deletions
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4
src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
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@ -310,6 +310,10 @@ fs_visitor::setup_payload_interference(struct ra_graph *g,
* node.
*/
for (int j = 0; j < this->virtual_grf_count; j++) {
/* Note that we use a <= comparison, unlike virtual_grf_interferes(),
* in order to not have to worry about the uniform issue described in
* calculate_live_intervals().
*/
if (this->virtual_grf_def[j] <= payload_last_use_ip[i] ||
this->virtual_grf_use[j] <= payload_last_use_ip[i]) {
ra_add_node_interference(g, first_payload_node + i, j);