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ra: note a restriction in the interfence graph API

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As noted in the previous commit, this was introduced in
567e2769b8 ("ra: make the p, q test more
efficient"), but I forgot to mention it.

Signed-off-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Connor Abbott 2014-09-05 20:59:31 -04:00 • committed by Andreas Boll
parent afd82dcad1
commit ec046bc08e
1 changed files with 4 additions and 1 deletions
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5
src/mesa/program/register_allocate.h
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@ -56,7 +56,10 @@ void ra_set_finalize(struct ra_regs *regs, unsigned int **conflicts);
* Each interference graph node is a virtual variable in the IL. It
* is up to the user to ra_set_node_class() for the virtual variable,
* and compute live ranges and ra_node_interfere() between conflicting
* live ranges.
* live ranges. Note that an interference *must not* be added between
* two nodes if their classes haven't been assigned yet. The user
* should set the class of each node before building the interference
* graph.
*/
struct ra_graph *ra_alloc_interference_graph(struct ra_regs *regs,
unsigned int count);