nir: Fix clone of nir_variable state slots

When num_state_slots is 0, don't create the array.  This was
triggering the following assert when running vkcube with
NIR_TEST_CLONE=1

    vkcube: ../src/compiler/nir/nir_split_per_member_structs.c:66:
    split_variable: Assertion `var->state_slots == NULL' failed.

Fixes: 9fbd390dd4b "nir: Add support for cloning shaders"
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

diff --git a/src/compiler/nir/nir_clone.c b/src/compiler/nir/nir_clone.c
index eec10a1b847ce3562040d4dd538fdc5c572c2976..f4000321575a2a3eb7b97cef6aa7e8ba839e6b8f 100644 (file)
--- a/src/compiler/nir/nir_clone.c
+++ b/src/compiler/nir/nir_clone.c
@@ -151,9 +151,11 @@ nir_variable_clone(const nir_variable *var, nir_shader *shader)
    nvar->name = ralloc_strdup(nvar, var->name);
    nvar->data = var->data;
    nvar->num_state_slots = var->num_state_slots;
-   nvar->state_slots = ralloc_array(nvar, nir_state_slot, var->num_state_slots);
-   memcpy(nvar->state_slots, var->state_slots,
-          var->num_state_slots * sizeof(nir_state_slot));
+   if (var->num_state_slots) {
+      nvar->state_slots = ralloc_array(nvar, nir_state_slot, var->num_state_slots);
+      memcpy(nvar->state_slots, var->state_slots,
+             var->num_state_slots * sizeof(nir_state_slot));
+   }
    if (var->constant_initializer) {
       nvar->constant_initializer =
          nir_constant_clone(var->constant_initializer, nvar);