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nir,intel: lower if (cond) demote() to new intrinsic demote_if(cond)

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This will effectively enable the optimization in anv.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Daniel Schürmann
2019-07-18 13:39:49 +02:00
committed by Jason Ekstrand
parent 517005b4cf
commit e272fdd508
5 changed files with 38 additions and 22 deletions
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11
src/compiler/nir/nir_opt_constant_folding.c
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@@ -119,7 +119,8 @@ constant_fold_intrinsic_instr(nir_intrinsic_instr *instr)
{
bool progress = false;
if (instr->intrinsic == nir_intrinsic_discard_if &&
if ((instr->intrinsic == nir_intrinsic_demote_if ||
instr->intrinsic == nir_intrinsic_discard_if) &&
nir_src_is_const(instr->src[0])) {
if (nir_src_as_bool(instr->src[0])) {
/* This method of getting a nir_shader * from a nir_instr is
@@ -131,9 +132,11 @@ constant_fold_intrinsic_instr(nir_intrinsic_instr *instr)
nir_function_impl *impl = nir_cf_node_get_function(cf_node);
nir_shader *shader = impl->function->shader;
nir_intrinsic_instr *discard =
nir_intrinsic_instr_create(shader, nir_intrinsic_discard);
nir_instr_insert_before(&instr->instr, &discard->instr);
nir_intrinsic_op op = instr->intrinsic == nir_intrinsic_discard_if ?
nir_intrinsic_discard :
nir_intrinsic_demote;
nir_intrinsic_instr *new_instr = nir_intrinsic_instr_create(shader, op);
nir_instr_insert_before(&instr->instr, &new_instr->instr);
nir_instr_remove(&instr->instr);
progress = true;
} else {