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nir: Add a block_is_unreachable helper

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Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
This commit is contained in:
Jason Ekstrand
2019-09-02 12:53:16 -05:00
parent 517142252f
commit f81a2623d8
2 changed files with 15 additions and 0 deletions
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1
src/compiler/nir/nir.h
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@@ -3373,6 +3373,7 @@ void nir_calc_dominance(nir_shader *shader);
nir_block *nir_dominance_lca(nir_block *b1, nir_block *b2); nir_block *nir_dominance_lca(nir_block *b1, nir_block *b2);
bool nir_block_dominates(nir_block *parent, nir_block *child); bool nir_block_dominates(nir_block *parent, nir_block *child);
bool nir_block_is_unreachable(nir_block *block);
void nir_dump_dom_tree_impl(nir_function_impl *impl, FILE *fp); void nir_dump_dom_tree_impl(nir_function_impl *impl, FILE *fp);
void nir_dump_dom_tree(nir_shader *shader, FILE *fp); void nir_dump_dom_tree(nir_shader *shader, FILE *fp);

14
src/compiler/nir/nir_dominance.c
View File

@@ -239,6 +239,20 @@ nir_block_dominates(nir_block *parent, nir_block *child)
child->dom_post_index <= parent->dom_post_index; child->dom_post_index <= parent->dom_post_index;
} }
bool
nir_block_is_unreachable(nir_block *block)
{
assert(nir_cf_node_get_function(&block->cf_node)->valid_metadata &
nir_metadata_dominance);
assert(nir_cf_node_get_function(&block->cf_node)->valid_metadata &
nir_metadata_block_index);
/* Unreachable blocks have no dominator. The only reachable block with no
* dominator is the start block which has index 0.
*/
return block->index > 0 && block->imm_dom == NULL;
}
void void
nir_dump_dom_tree_impl(nir_function_impl *impl, FILE *fp) nir_dump_dom_tree_impl(nir_function_impl *impl, FILE *fp)
{ {