spirv: Allow constants and NULLs in SpvOpConvertUToPtr

We were accidentally asserting that the value had to be a vtn_ssa_value
which isn't true if it, for instance, comes from a spec constant.

Fixes: fb282a68bc46 "spirv: Implement OpConvertPtrToU and OpConvertUToPtr"
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4675>

diff --git a/src/compiler/spirv/vtn_variables.c b/src/compiler/spirv/vtn_variables.c
index a4b5799afc48662e08479c0d612a509dd3ad8707..9a6ddc2db1ee04e88c7d611e333a8b5410788cca 100644 (file)
--- a/src/compiler/spirv/vtn_variables.c
+++ b/src/compiler/spirv/vtn_variables.c
@@ -2751,7 +2751,7 @@ vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
    case SpvOpConvertUToPtr: {
       struct vtn_value *ptr_val =
          vtn_push_value(b, w[2], vtn_value_type_pointer);
-      struct vtn_value *u_val = vtn_value(b, w[3], vtn_value_type_ssa);
+      struct vtn_value *u_val = vtn_untyped_value(b, w[3]);
 
       vtn_fail_if(ptr_val->type->type == NULL,
                   "OpConvertUToPtr can only be used on physical pointers");
@@ -2761,7 +2761,8 @@ vtn_handle_variables(struct vtn_builder *b, SpvOp opcode,
                   "OpConvertUToPtr can only be used to cast from a vector or "
                   "scalar type");
 
-      nir_ssa_def *ptr_ssa = nir_sloppy_bitcast(&b->nb, u_val->ssa->def,
+      struct vtn_ssa_value *u_ssa = vtn_ssa_value(b, w[3]);
+      nir_ssa_def *ptr_ssa = nir_sloppy_bitcast(&b->nb, u_ssa->def,
                                                 ptr_val->type->type);
       ptr_val->pointer = vtn_pointer_from_ssa(b, ptr_ssa, ptr_val->type);
       vtn_foreach_decoration(b, ptr_val, ptr_decoration_cb, ptr_val->pointer);