freedreno/ir3: Skip tess epilogue if the program is missing stores.

Some of the negative API tests make shaders for tess stages that don't do
all the stores they need to.  Once we start precompiling (or doing
shader-db of tess), we need to at least not segfault when generating them.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4562>

diff --git a/src/freedreno/ir3/ir3_nir_lower_tess.c b/src/freedreno/ir3/ir3_nir_lower_tess.c
index 7a30ef09d9760114228d7fe438c78325523eaf12..4d8798c285fd436104cf2dbf1f6bf4c6857f83c1 100644 (file)
--- a/src/freedreno/ir3/ir3_nir_lower_tess.c
+++ b/src/freedreno/ir3/ir3_nir_lower_tess.c
@@ -524,6 +524,9 @@ emit_tess_epilouge(nir_builder *b, struct state *state)
        nir_ssa_def *tessfactor_address = nir_load_tess_factor_base_ir3(b);
        nir_ssa_def *levels[2];
 
+       if (!state->outer_levels[0])
+               return;
+
        /* Then emit the epilogue that actually writes out the tessellation levels
         * to the BOs.
         */