nir: Add a global code motion (GCM) pass

v2 Jason Ekstrand <[email protected]>:
 - Use nir_dominance_lca for computing least common anscestors
 - Use the block index for comparing dominance tree depths
 - Pin things that do partial derivatives

Reviewed-by: Reviewed-by: Connor Abbott <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index 827c1966f3d..a109f0fa297 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1604,6 +1604,8 @@ bool nir_opt_cse(nir_shader *shader);
 bool nir_opt_dce_impl(nir_function_impl *impl);
 bool nir_opt_dce(nir_shader *shader);
 
+void nir_opt_gcm(nir_shader *shader);
+
 bool nir_opt_peephole_select(nir_shader *shader);
 bool nir_opt_peephole_ffma(nir_shader *shader);