nir: Add a nir_lower_load_const_to_scalar() pass.

This is useful to increase the CSE opportunities for a scalar backend.  It
avoids regressions when dropping vc4's custom CSE implementation.

v2: Cleanups by Matt (decl in the for loop, and unreachable()).
Reviewed-by: Matt Turner <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/glsl/nir/nir.h b/src/glsl/nir/nir.h
index 0603b3eec67..9aae6d70354 100644
--- a/src/glsl/nir/nir.h
+++ b/src/glsl/nir/nir.h
@@ -1654,6 +1654,7 @@ void nir_remove_dead_variables(nir_shader *shader);
 
 void nir_lower_vec_to_movs(nir_shader *shader);
 void nir_lower_alu_to_scalar(nir_shader *shader);
+void nir_lower_load_const_to_scalar(nir_shader *shader);
 
 void nir_lower_phis_to_scalar(nir_shader *shader);