nir: add nir_variable::index and nir_index_vars

This will be useful as a deterministic identifier/index for the variable.

v2: fix comment style

Signed-off-by: Rhys Perry <[email protected]>
Reviewed-by: Connor Abbott <[email protected]> (v1)

1 files changed, 8 insertions, 0 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 4db85b3fafd..e88d3f8df96 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -504,6 +504,12 @@ typedef struct nir_variable {
       };
    } data;
 
+   /**
+    * Identifier for this variable generated by nir_index_vars() that is unique
+    * among other variables in the same exec_list.
+    */
+   unsigned index;
+
    /* Number of nir_variable_data members */
    uint16_t num_members;
 
@@ -3340,6 +3346,8 @@ unsigned nir_index_instrs(nir_function_impl *impl);
 
 void nir_index_blocks(nir_function_impl *impl);
 
+void nir_index_vars(nir_shader *shader, nir_function_impl *impl, nir_variable_mode modes);
+
 void nir_print_shader(nir_shader *shader, FILE *fp);
 void nir_print_shader_annotated(nir_shader *shader, FILE *fp, struct hash_table *errors);
 void nir_print_instr(const nir_instr *instr, FILE *fp);