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pan/bi: Implement bi_choose_spill_node 

Simplified from Midgard.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7206>
This commit is contained in:
Alyssa Rosenzweig 2020-10-14 18:59:33 -04:00 committed by Marge Bot
parent ab9abc9052
commit 7246dd88cd
1 changed files with 24 additions and 0 deletions
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24
src/panfrost/bifrost/bi_ra.c
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@ -174,6 +174,24 @@ bi_install_registers(bi_context *ctx, struct lcra_state *l)
}
}
/* If register allocation fails, find the best spill node */
static signed
bi_choose_spill_node(bi_context *ctx, struct lcra_state *l)
{
/* Pick a node satisfying bi_spill_register's preconditions */
bi_foreach_instr_global(ctx, ins) {
if (ins->no_spill)
lcra_set_node_spill_cost(l, ins->dest, -1);
}
for (unsigned i = PAN_IS_REG; i < l->node_count; i += 2)
lcra_set_node_spill_cost(l, i, -1);
return lcra_get_best_spill_node(l);
}
void
bi_register_allocate(bi_context *ctx)
{
@ -197,8 +215,14 @@ bi_register_allocate(bi_context *ctx)
do {
if (l) {
signed spill_node = bi_choose_spill_node(ctx, l);
lcra_free(l);
l = NULL;
if (spill_node == -1)
unreachable("Failed to choose spill node\n");
unreachable("Spilling not implemented");
}