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nir/lcssa: allow to create LCSSA phis for loop-invariant booleans

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ACO depends on LCSSA phis for divergent booleans to work correctly.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Rhys Perry
2019-08-05 15:24:18 +01:00
committed by Daniel Schürmann
parent 9c40ad49d5
commit 911a1dfad2
2 changed files with 7 additions and 3 deletions
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2
src/compiler/nir/nir.h
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@@ -3923,7 +3923,7 @@ bool nir_repair_ssa_impl(nir_function_impl *impl);
bool nir_repair_ssa(nir_shader *shader);
void nir_convert_loop_to_lcssa(nir_loop *loop);
bool nir_convert_to_lcssa(nir_shader *shader, bool skip_invariants);
bool nir_convert_to_lcssa(nir_shader *shader, bool skip_invariants, bool skip_bool_invariants);
/* If phi_webs_only is true, only convert SSA values involved in phi nodes to
* registers. If false, convert all values (even those not involved in a phi

8
src/compiler/nir/nir_to_lcssa.c
View File

@@ -48,6 +48,7 @@ typedef struct {
/* Whether to skip loop invariant variables */
bool skip_invariants;
bool skip_bool_invariants;
bool progress;
} lcssa_state;
@@ -193,7 +194,8 @@ convert_loop_exit_for_ssa(nir_ssa_def *def, void *void_state)
bool all_uses_inside_loop = true;
/* Don't create LCSSA-Phis for loop-invariant variables */
if (state->skip_invariants) {
if (state->skip_invariants &&
(def->bit_size != 1 || state->skip_bool_invariants)) {
assert(def->parent_instr->pass_flags != undefined);
if (def->parent_instr->pass_flags == invariant)
return true;
@@ -361,6 +363,7 @@ nir_convert_loop_to_lcssa(nir_loop *loop)
state->loop = loop;
state->shader = impl->function->shader;
state->skip_invariants = false;
state->skip_bool_invariants = false;
nir_foreach_block_in_cf_node (block, &loop->cf_node) {
nir_foreach_instr(instr, block)
@@ -371,12 +374,13 @@ nir_convert_loop_to_lcssa(nir_loop *loop)
}
bool
nir_convert_to_lcssa(nir_shader *shader, bool skip_invariants)
nir_convert_to_lcssa(nir_shader *shader, bool skip_invariants, bool skip_bool_invariants)
{
bool progress = false;
lcssa_state *state = rzalloc(NULL, lcssa_state);
state->shader = shader;
state->skip_invariants = skip_invariants;
state->skip_bool_invariants = skip_bool_invariants;
nir_foreach_function(function, shader) {
if (function->impl == NULL)