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nir/opt_loop_unroll: Fix has_nested_loop handling

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In 87839680c0, a very subtle mistake was made with the CFG walking
recursion.  Instead of setting the local has_nested_loop variable when
process child loops, has_nested_loop_out was passed directly into the
process_loop_in_block call.  This broke nested loop detection heuristics
and caused loop unrolling to run massively out of control.  In
particular, it makes the following CTS test compile virtually forever:

dEQP-VK.spirv_assembly.instruction.graphics.16bit_storage.struct_mixed_types.uniform_buffer_block_geom

Fixes: 87839680c0 "nir: Fix breakage of foreach_list_typed_safe..."
Closes: #2710
Reviewed-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4380>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4380>
This commit is contained in:
Jason Ekstrand
2020-03-30 16:39:01 -05:00
committed by Marge Bot
parent 92afe94d28
commit b113170559
1 changed files with 1 additions and 1 deletions
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src/compiler/nir/nir_opt_loop_unroll.c
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@@ -851,7 +851,7 @@ process_loops(nir_shader *sh, nir_cf_node *cf_node, bool *has_nested_loop_out,
}
case nir_cf_node_loop: {
loop = nir_cf_node_as_loop(cf_node);
progress |= process_loops_in_block(sh, &loop->body, has_nested_loop_out);
progress |= process_loops_in_block(sh, &loop->body, &has_nested_loop);
break;
}