nir/lcssa: handle deref instructions properly

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Fixes: 414148cdc124 "nir: Support deref instructions in loop_analyze"

1 files changed, 5 insertions, 7 deletions

diff --git a/src/compiler/nir/nir_deref.c b/src/compiler/nir/nir_deref.c
index da66c5f0487..f7a07c6b465 100644
--- a/src/compiler/nir/nir_deref.c
+++ b/src/compiler/nir/nir_deref.c
@@ -216,17 +216,15 @@ nir_deref_instr_has_complex_use(nir_deref_instr *deref)
 unsigned
 nir_deref_instr_ptr_as_array_stride(nir_deref_instr *deref)
 {
-   assert(deref->deref_type == nir_deref_type_ptr_as_array);
-   nir_deref_instr *parent = nir_deref_instr_parent(deref);
-   switch (parent->deref_type) {
+   switch (deref->deref_type) {
    case nir_deref_type_array:
-      return glsl_get_explicit_stride(nir_deref_instr_parent(parent)->type);
+      return glsl_get_explicit_stride(nir_deref_instr_parent(deref)->type);
    case nir_deref_type_ptr_as_array:
-      return nir_deref_instr_ptr_as_array_stride(parent);
+      return nir_deref_instr_ptr_as_array_stride(nir_deref_instr_parent(deref));
    case nir_deref_type_cast:
-      return parent->cast.ptr_stride;
+      return deref->cast.ptr_stride;
    default:
-      unreachable("Invalid parent for ptr_as_array deref");
+      return 0;
    }
 }