[Mesa-dev] [RFC 2/6] nir/builder: Add a helper for loading from a deref_var

[Jason Ekstrand]

---
 src/compiler/nir/nir_builder.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
index 88ba3a1..1252301 100644
--- a/src/compiler/nir/nir_builder.h
+++ b/src/compiler/nir/nir_builder.h
@@ -334,6 +334,21 @@ nir_load_var(nir_builder *build, nir_variable *var)
    return &load->dest.ssa;
 }
 
+static inline nir_ssa_def *
+nir_load_deref_var(nir_builder *build, nir_deref_var *deref)
+{
+   const struct nir_deref *deref_tail = nir_deref_tail(&deref->deref);
+   const unsigned num_components = glsl_get_vector_elements(deref_tail->type);
+
+   nir_intrinsic_instr *load =
+      nir_intrinsic_instr_create(build->shader, nir_intrinsic_load_var);
+   load->num_components = num_components;
+   load->variables[0] = nir_copy_deref_var(load, deref);
+   nir_ssa_dest_init(&load->instr, &load->dest, num_components, NULL);
+   nir_builder_instr_insert(build, &load->instr);
+   return &load->dest.ssa;
+}
+
 static inline void
 nir_store_var(nir_builder *build, nir_variable *var, nir_ssa_def *value,
               unsigned writemask)
-- 
2.5.0.400.gff86faf