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nir/dead_cf: Remove dead control flow after infinite loops.

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And after discard-only loops. Otherwise we end up with dead code
which confuses nir_repair_ssa into adding a whole bunch of uses
of undefined. However, for derefs, we sometimes always expect to
get a variable instead of undefined.

Fixes dEQP-VK.graphicsfuzz.write-red-in-loop-nest on radv.

Fixes: c832820ce9 "nir/dead_cf: Repair SSA if the pass makes progress"
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/1928
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
(cherry picked from commit 6da3bf2600)
This commit is contained in:
Bas Nieuwenhuizen 2019-10-11 14:49:05 +02:00 • committed by Dylan Baker
parent 8355658fa8
commit b87edab8a2
1 changed files with 7 additions and 0 deletions
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7
src/compiler/nir/nir_opt_dead_cf.c
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@ -334,6 +334,13 @@ dead_cf_list(struct exec_list *list, bool *list_ends_in_jump)
bool dummy;
progress |= dead_cf_list(&loop->body, &dummy);
nir_block *next = nir_cf_node_as_block(nir_cf_node_next(cur));
if (next->predecessors->entries == 0 &&
(!exec_list_is_empty(&next->instr_list) ||
!exec_node_is_tail_sentinel(next->cf_node.node.next))) {
remove_after_cf_node(cur);
return true;
}
break;
}