nir/lower_io_arrays_to_elements: Look at derefs for modes

This is instead of looking all the way back to the variable which may
not exist for all derefs.  This makes this code properly ignore casts
with modes other than the mode[s] we care about (where casts aren't
allowed).

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

diff --git a/src/compiler/nir/nir_lower_io_arrays_to_elements.c b/src/compiler/nir/nir_lower_io_arrays_to_elements.c
index f0bc487..4453eaa 100644 (file)
--- a/src/compiler/nir/nir_lower_io_arrays_to_elements.c
+++ b/src/compiler/nir/nir_lower_io_arrays_to_elements.c
@@ -229,11 +229,11 @@ create_indirects_mask(nir_shader *shader, uint64_t *indirects,
                   continue;
 
                nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
-               nir_variable *var = nir_deref_instr_get_variable(deref);
-
-               if (var->data.mode != mode)
+               if (deref->mode != mode)
                   continue;
 
+               nir_variable *var = nir_deref_instr_get_variable(deref);
+
                nir_deref_path path;
                nir_deref_path_init(&path, deref, NULL);
 
@@ -278,8 +278,11 @@ lower_io_arrays_to_elements(nir_shader *shader, nir_variable_mode mask,
                    intr->intrinsic != nir_intrinsic_interp_deref_at_offset)
                   continue;
 
-               nir_variable *var =
-                  nir_deref_instr_get_variable(nir_src_as_deref(intr->src[0]));
+               nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
+               if (!(deref->mode & mask))
+                  continue;
+
+               nir_variable *var = nir_deref_instr_get_variable(deref);
 
                /* Skip indirects */
                uint64_t loc_mask = ((uint64_t)1) << var->data.location;