nir/validate: don't add instrs not present in shader to shader_gc_list

This makes the set smaller and GC list validation faster.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13547>

diff --git a/src/compiler/nir/nir_validate.c b/src/compiler/nir/nir_validate.c
index c00dec9..0bc1b5a 100644 (file)
--- a/src/compiler/nir/nir_validate.c
+++ b/src/compiler/nir/nir_validate.c
@@ -1720,8 +1720,10 @@ nir_validate_shader(nir_shader *shader, const char *when)
    init_validate_state(&state);
 
    if (state.shader_gc_list) {
-      list_for_each_entry(nir_instr, instr, &shader->gc_list, gc_node)
-         _mesa_set_add(state.shader_gc_list, instr);
+      list_for_each_entry(nir_instr, instr, &shader->gc_list, gc_node) {
+         if (instr->node.prev || instr->node.next)
+            _mesa_set_add(state.shader_gc_list, instr);
+      }
    }
 
    state.shader = shader;