From 911a1dfad25feb32e7030b54abd0c69e415f9cc7 Mon Sep 17 00:00:00 2001 From: Rhys Perry Date: Mon, 5 Aug 2019 15:24:18 +0100 Subject: [PATCH] nir/lcssa: allow to create LCSSA phis for loop-invariant booleans ACO depends on LCSSA phis for divergent booleans to work correctly. Reviewed-by: Connor Abbott Reviewed-by: Jason Ekstrand --- src/compiler/nir/nir.h | 2 +- src/compiler/nir/nir_to_lcssa.c | 8 ++++++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h index 6146445..57326fe 100644 --- a/src/compiler/nir/nir.h +++ b/src/compiler/nir/nir.h @@ -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 diff --git a/src/compiler/nir/nir_to_lcssa.c b/src/compiler/nir/nir_to_lcssa.c index e66d89a..e5b760c 100644 --- a/src/compiler/nir/nir_to_lcssa.c +++ b/src/compiler/nir/nir_to_lcssa.c @@ -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) -- 2.7.4