radeonsi/nir: perform radeonsi-specific lowering and optimization passes

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_shader_nir.c b/src/gallium/drivers/radeonsi/si_shader_nir.c
index 2c311d3865d9fd0b419e36cded71df6a35232c95..d87f6b831d8ade8bc18216e07440d431507a7bae 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader_nir.c
+++ b/src/gallium/drivers/radeonsi/si_shader_nir.c
@@ -337,6 +337,47 @@ si_lower_nir(struct si_shader_selector* sel)
                                variable->data.driver_location += 1;
                }
        }
+
+       /* Perform lowerings (and optimizations) of code.
+        *
+        * Performance considerations aside, we must:
+        * - lower certain ALU operations
+        * - ensure constant offsets for texture instructions are folded
+        *   and copy-propagated
+        */
+       NIR_PASS_V(sel->nir, nir_lower_returns);
+       NIR_PASS_V(sel->nir, nir_lower_vars_to_ssa);
+       NIR_PASS_V(sel->nir, nir_lower_alu_to_scalar);
+       NIR_PASS_V(sel->nir, nir_lower_phis_to_scalar);
+
+       bool progress;
+       do {
+               progress = false;
+
+               /* (Constant) copy propagation is needed for txf with offsets. */
+               NIR_PASS(progress, sel->nir, nir_copy_prop);
+               NIR_PASS(progress, sel->nir, nir_opt_remove_phis);
+               NIR_PASS(progress, sel->nir, nir_opt_dce);
+               if (nir_opt_trivial_continues(sel->nir)) {
+                       progress = true;
+                       NIR_PASS(progress, sel->nir, nir_copy_prop);
+                       NIR_PASS(progress, sel->nir, nir_opt_dce);
+               }
+               NIR_PASS(progress, sel->nir, nir_opt_if);
+               NIR_PASS(progress, sel->nir, nir_opt_dead_cf);
+               NIR_PASS(progress, sel->nir, nir_opt_cse);
+               NIR_PASS(progress, sel->nir, nir_opt_peephole_select, 8);
+
+               /* Needed for algebraic lowering */
+               NIR_PASS(progress, sel->nir, nir_opt_algebraic);
+               NIR_PASS(progress, sel->nir, nir_opt_constant_folding);
+
+               NIR_PASS(progress, sel->nir, nir_opt_undef);
+               NIR_PASS(progress, sel->nir, nir_opt_conditional_discard);
+               if (sel->nir->options->max_unroll_iterations) {
+                       NIR_PASS(progress, sel->nir, nir_opt_loop_unroll, 0);
+               }
+       } while (progress);
 }
 
 static void declare_nir_input_vs(struct si_shader_context *ctx,