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pan/midgard: Compute spill costs

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-10-26 10:08:18 -04:00
parent eb6352162d
commit 23c83f3f05
1 changed files with 13 additions and 2 deletions
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15
src/panfrost/midgard/midgard_schedule.c
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@ -1195,10 +1195,21 @@ static void mir_spill_register(
* spill node. All nodes are equal in spill cost, but we can't spill
* nodes written to from an unspill */
for (unsigned i = 0; i < ctx->temp_count; ++i) {
lcra_set_node_spill_cost(l, i, 1);
unsigned *cost = calloc(ctx->temp_count, sizeof(cost[0]));
mir_foreach_instr_global(ctx, ins) {
if (ins->dest < ctx->temp_count)
cost[ins->dest]++;
mir_foreach_src(ins, s) {
if (ins->src[s] < ctx->temp_count)
cost[ins->src[s]]++;
}
}
for (unsigned i = 0; i < ctx->temp_count; ++i)
lcra_set_node_spill_cost(l, i, cost[i]);
/* We can't spill any bundles that contain unspills. This could be
* optimized to allow use of r27 to spill twice per bundle, but if
* you're at the point of optimizing spilling, it's too late.