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nir/nir: Patch up phi predecessors in move_successors

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Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-11-07 19:35:23 -08:00
parent 02eef48343
commit ef7ebb908e
1 changed files with 23 additions and 2 deletions
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25
src/glsl/nir/nir.c
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@ -730,6 +730,23 @@ split_block_beginning(nir_block *block)
return new_block;
}
static void
rewrite_phi_preds(nir_block *block, nir_block *old_pred, nir_block *new_pred)
{
nir_foreach_instr_safe(block, instr) {
if (instr->type != nir_instr_type_phi)
break;
nir_phi_instr *phi = nir_instr_as_phi(instr);
foreach_list_typed_safe(nir_phi_src, src, node, &phi->srcs) {
if (src->pred == old_pred) {
src->pred = new_pred;
break;
}
}
}
}
/**
* Moves the successors of source to the successors of dest, leaving both
* successors of source NULL.
@ -741,11 +758,15 @@ move_successors(nir_block *source, nir_block *dest)
nir_block *succ1 = source->successors[0];
nir_block *succ2 = source->successors[1];
if (succ1)
if (succ1) {
unlink_blocks(source, succ1);
rewrite_phi_preds(succ1, source, dest);
}
if (succ2)
if (succ2) {
unlink_blocks(source, succ2);
rewrite_phi_preds(succ2, source, dest);
}
unlink_block_successors(dest);
link_blocks(dest, succ1, succ2);