nir: Return progress from nir_lower_regs_to_ssa().

And from nir_lower_regs_to_ssa_impl() as well.

Reviewed-by: Jason Ekstrand <[email protected]>

2 files changed, 10 insertions, 6 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 8bf517c3335..8e1721a92dc 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2389,8 +2389,8 @@ nir_src *nir_get_io_vertex_index_src(nir_intrinsic_instr *instr);
 bool nir_is_per_vertex_io(nir_variable *var, gl_shader_stage stage);
 
 void nir_lower_io_types(nir_shader *shader);
-void nir_lower_regs_to_ssa_impl(nir_function_impl *impl);
-void nir_lower_regs_to_ssa(nir_shader *shader);
+bool nir_lower_regs_to_ssa_impl(nir_function_impl *impl);
+bool nir_lower_regs_to_ssa(nir_shader *shader);
 bool nir_lower_vars_to_ssa(nir_shader *shader);
 
 bool nir_remove_dead_variables(nir_shader *shader, nir_variable_mode modes);
diff --git a/src/compiler/nir/nir_lower_regs_to_ssa.c b/src/compiler/nir/nir_lower_regs_to_ssa.c
index 095bae66927..d70e70260be 100644
--- a/src/compiler/nir/nir_lower_regs_to_ssa.c
+++ b/src/compiler/nir/nir_lower_regs_to_ssa.c
@@ -210,11 +210,11 @@ rewrite_alu_instr(nir_alu_instr *alu, struct regs_to_ssa_state *state)
                                        &vec->dest.dest.ssa);
 }
 
-void
+bool
 nir_lower_regs_to_ssa_impl(nir_function_impl *impl)
 {
    if (exec_list_is_empty(&impl->registers))
-      return;
+      return false;
 
    nir_metadata_require(impl, nir_metadata_block_index |
                               nir_metadata_dominance);
@@ -279,15 +279,19 @@ nir_lower_regs_to_ssa_impl(nir_function_impl *impl)
 
    nir_metadata_preserve(impl, nir_metadata_block_index |
                                nir_metadata_dominance);
+   return true;
 }
 
-void
+bool
 nir_lower_regs_to_ssa(nir_shader *shader)
 {
    assert(exec_list_is_empty(&shader->registers));
+   bool progress = false;
 
    nir_foreach_function(function, shader) {
       if (function->impl)
-         nir_lower_regs_to_ssa_impl(function->impl);
+         progress |= nir_lower_regs_to_ssa_impl(function->impl);
    }
+
+   return progress;
 }