summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorIan Romanick <ian.d.romanick@intel.com>2010-08-27 11:26:08 -0700
committerIan Romanick <ian.d.romanick@intel.com>2010-09-03 11:55:21 -0700
commit7850ce0a9990c7f752e43a1dd88c204a7cf090aa (patch)
tree3154778768f146e2c5474c520fc3e394b95c4066
parent8df2dbf91ddfd0c1590e33015e85470b67e69319 (diff)
glsl2: Eliminate zero-iteration loops
-rw-r--r--src/glsl/loop_controls.cpp8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/glsl/loop_controls.cpp b/src/glsl/loop_controls.cpp
index 2eddb91364..9eb1a8901b 100644
--- a/src/glsl/loop_controls.cpp
+++ b/src/glsl/loop_controls.cpp
@@ -234,7 +234,7 @@ loop_control_visitor::visit_leave(ir_loop *ir)
const int iterations = calculate_iterations(init, limit,
lv->increment,
cmp);
- if (iterations > 0) {
+ if (iterations >= 0) {
/* If the new iteration count is lower than the previously
* believed iteration count, update the loop control values.
*/
@@ -267,6 +267,12 @@ loop_control_visitor::visit_leave(ir_loop *ir)
}
}
+ /* If we have proven the one of the loop exit conditions is satisifed before
+ * running the loop once, remove the loop.
+ */
+ if (max_iterations == 0)
+ ir->remove();
+
return visit_continue;
}