glsl: Skip the rest of loop unrolling if no loops were found.

Shaves 1.6% (+/- 1.0%) off of ff_fragment_shader glean texCombine time
(n=5).

1 files changed, 4 insertions, 2 deletions

diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index cbeacd5633..77885d4e1e 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -748,8 +748,10 @@ do_common_optimization(exec_list *ir, bool linked, unsigned max_unroll_iteration
    progress = optimize_redundant_jumps(ir) || progress;
 
    loop_state *ls = analyze_loop_variables(ir);
-   progress = set_loop_controls(ir, ls) || progress;
-   progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
+   if (ls->loop_found) {
+      progress = set_loop_controls(ir, ls) || progress;
+      progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
+   }
    delete ls;
 
    return progress;