nir/cf: add insert_phi_undef() helper
Signed-off-by: Connor Abbott <connor.w.abbott@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@ -230,6 +230,31 @@ rewrite_phi_preds(nir_block *block, nir_block *old_pred, nir_block *new_pred)
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}
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}
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static void
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insert_phi_undef(nir_block *block, nir_block *pred)
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{
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nir_function_impl *impl = nir_cf_node_get_function(&block->cf_node);
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nir_foreach_instr(block, instr) {
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if (instr->type != nir_instr_type_phi)
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break;
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nir_phi_instr *phi = nir_instr_as_phi(instr);
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nir_ssa_undef_instr *undef =
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nir_ssa_undef_instr_create(ralloc_parent(phi),
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phi->dest.ssa.num_components);
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nir_instr_insert_before_cf_list(&impl->body, &undef->instr);
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nir_phi_src *src = ralloc(phi, nir_phi_src);
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src->pred = pred;
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src->src.parent_instr = &phi->instr;
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src->src.is_ssa = true;
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src->src.ssa = &undef->def;
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list_addtail(&src->src.use_link, &undef->def.uses);
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exec_list_push_tail(&phi->srcs, &src->node);
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}
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}
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/**
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* Moves the successors of source to the successors of dest, leaving both
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* successors of source NULL.
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