From: Nicolai Hähnle <nicolai.haeh...@amd.com>
---
src/gallium/drivers/radeonsi/si_shader_nir.c | 41 ++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/src/gallium/drivers/radeonsi/si_shader_nir.c
b/src/gallium/drivers/radeonsi/si_shader_nir.c
index dc2ef8b..83c7ab1 100644
--- a/src/gallium/drivers/radeonsi/si_shader_nir.c
+++ b/src/gallium/drivers/radeonsi/si_shader_nir.c
@@ -330,20 +330,61 @@ si_lower_nir(struct si_shader_selector* sel)
nir_foreach_variable(variable, &sel->nir->outputs) {
variable->data.driver_location *= 4;
if (sel->nir->stage == MESA_SHADER_FRAGMENT) {
if (variable->data.location == FRAG_RESULT_DEPTH)
variable->data.driver_location += 2;
else if (variable->data.location == FRAG_RESULT_STENCIL)
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,
struct nir_variable *variable, unsigned rel,
LLVMValueRef out[4])
{
si_llvm_load_input_vs(ctx, variable->data.driver_location / 4 + rel,
out);
}
static void declare_nir_input_fs(struct si_shader_context *ctx,
--
2.9.3
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