Mesa (main): intel/compiler: Convert to LCSSA and use divergence analysis.

[GitLab Mirror]

Module: Mesa
Branch: main
Commit: 49ef23f4a681e9132a13e4ef366b0641b1c1fe5e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=49ef23f4a681e9132a13e4ef366b0641b1c1fe5e

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Tue Mar 15 16:25:55 2022 -0700

intel/compiler: Convert to LCSSA and use divergence analysis.

We'll use this more shortly.  For now, enable it to separately in case
anything bisects to this.

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Caio Oliveira <caio.oliveira at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15484>

---

 src/intel/compiler/brw_nir.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/intel/compiler/brw_nir.c b/src/intel/compiler/brw_nir.c
index e764041b623..e8526ecefca 100644
--- a/src/intel/compiler/brw_nir.c
+++ b/src/intel/compiler/brw_nir.c
@@ -1213,6 +1213,12 @@ brw_postprocess_nir(nir_shader *nir, const struct brw_compiler *compiler,
    OPT(nir_opt_move, nir_move_comparisons);
    OPT(nir_opt_dead_cf);
 
+   NIR_PASS_V(nir, nir_convert_to_lcssa, true, true);
+   NIR_PASS_V(nir, nir_divergence_analysis);
+
+   /* Clean up LCSSA phis */
+   OPT(nir_opt_remove_phis);
+
    OPT(nir_lower_bool_to_int32);
    OPT(nir_copy_prop);
    OPT(nir_opt_dce);