nir: gather info whether a shader uses demote_to_helper

[mesa.git] / src / compiler / nir / nir_gather_info.c

diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c
index 0a89c4b9b4463dd22603386ffb5e185e2ab1415a..c301742dd7a765a3a2e92eb763f737d683966f97 100644 (file)
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -200,6 +200,8 @@ gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader,
    switch (instr->intrinsic) {
    case nir_intrinsic_demote:
    case nir_intrinsic_demote_if:
+      shader->info.fs.uses_demote = true;
+   /* fallthrough: quads with helper lanes only might be discarded entirely */
    case nir_intrinsic_discard:
    case nir_intrinsic_discard_if:
       assert(shader->info.stage == MESA_SHADER_FRAGMENT);
@@ -389,6 +391,7 @@ nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
    if (shader->info.stage == MESA_SHADER_FRAGMENT) {
       shader->info.fs.uses_sample_qualifier = false;
       shader->info.fs.uses_discard = false;
+      shader->info.fs.uses_demote = false;
       shader->info.fs.needs_helper_invocations = false;
    }