Mesa (master): nir/builder: Add a load_deref_var helper

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 75a6707984d520d70df14fca46f29ac9e4e7e8d9
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=75a6707984d520d70df14fca46f29ac9e4e7e8d9

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Sat Dec 10 11:32:29 2016 -0800

nir/builder: Add a load_deref_var helper

Reviewed-by: Timothy Arceri <timothy.arceri at collabora.com>

---

 src/compiler/nir/nir_builder.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
index 2ea9af1..1da30ab 100644
--- a/src/compiler/nir/nir_builder.h
+++ b/src/compiler/nir/nir_builder.h
@@ -411,6 +411,22 @@ 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 glsl_type *type = nir_deref_tail(&deref->deref)->type;
+   const unsigned num_components = glsl_get_vector_elements(type);
+
+   nir_intrinsic_instr *load =
+      nir_intrinsic_instr_create(build->shader, nir_intrinsic_load_var);
+   load->num_components = num_components;
+   load->variables[0] = nir_deref_var_clone(deref, load);
+   nir_ssa_dest_init(&load->instr, &load->dest, num_components,
+                     glsl_get_bit_size(type), 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)