---
src/compiler/glsl/opt_rebalance_tree.cpp | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/compiler/glsl/opt_rebalance_tree.cpp
b/src/compiler/glsl/opt_rebalance_tree.cpp
index 095f2d7..8045d51 100644
--- a/src/compiler/glsl/opt_rebalance_tree.cpp
+++ b/src/compiler/glsl/opt_rebalance_tree.cpp
@@ -131,6 +131,8 @@ public:
progress = false;
}
+ virtual ir_visitor_status visit_enter(ir_assignment *ir);
+
void handle_rvalue(ir_rvalue **rvalue);
bool progress;
@@ -146,6 +148,20 @@ struct is_reduction_data {
} /* anonymous namespace */
+ir_visitor_status
+ir_rebalance_visitor::visit_enter(ir_assignment *ir)
+{
+ ir_variable *var = ir->lhs->variable_referenced();
+ if (var->data.invariant || var->data.precise) {
+ /* If we're assigning to an invariant variable, just bail. Tree
+ * rebalancing (reassociation) isn't precision-safe.
+ */
+ return visit_continue_with_parent;
+ } else {
+ return visit_continue;
+ }
+}
+
static bool
is_reduction_operation(ir_expression_operation operation)
{
--
2.5.0.400.gff86faf
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