nir: Add return lowering pass

This commit adds a NIR pass for lowering away returns in functions.  If the
return is in a loop, it is lowered to a break.  If it is not in a loop,
it's lowered away by moving/deleting code as needed.

Reviewed-by: Jordan Justen <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 51d2e79f570..78bbdc0b78c 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2146,6 +2146,9 @@ int nir_gs_count_vertices(const nir_shader *shader);
 
 bool nir_split_var_copies(nir_shader *shader);
 
+bool nir_lower_returns_impl(nir_function_impl *impl);
+bool nir_lower_returns(nir_shader *shader);
+
 void nir_lower_var_copy_instr(nir_intrinsic_instr *copy, void *mem_ctx);
 void nir_lower_var_copies(nir_shader *shader);