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| author | Jason Ekstrand <[email protected]> | 2019-09-02 12:54:31 -0500 |
|---|---|---|
| committer | Jason Ekstrand <[email protected]> | 2019-09-06 23:39:01 +0000 |
| commit | a3268599f3c9bb1d92571e15df95750a06114811 (patch) | |
| tree | 6bd228dbd76cb9721f7a173eeeb2cf73b03e8891 /include | |
| parent | f81a2623d82ccad6177fe1fe5b80a6398df29b6e (diff) | |
nir/repair_ssa: Repair dominance for unreachable blocks
NIR currently assumes that unreachable blocks are trivially dominated by
everything. However, when considering well-formed SSA, there is no path
from any block to an unreachable block. Therefore, we can break any
use-def chains where the use is in an unreachable block. This removes
any dependencies on code created by uses in unreachable blocks and lets
DCE do a better job of cleaning it up.
Cc: [email protected]
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>
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