---
src/compiler/glsl/opt_algebraic.cpp | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/src/compiler/glsl/opt_algebraic.cpp
b/src/compiler/glsl/opt_algebraic.cpp
index 1e58062..2fea240 100644
--- a/src/compiler/glsl/opt_algebraic.cpp
+++ b/src/compiler/glsl/opt_algebraic.cpp
@@ -58,6 +58,8 @@ public:
{
}
+ virtual ir_visitor_status visit_enter(ir_assignment *ir);
+
ir_rvalue *handle_expression(ir_expression *ir);
void handle_rvalue(ir_rvalue **rvalue);
bool reassociate_constant(ir_expression *ir1,
@@ -80,6 +82,20 @@ public:
} /* unnamed namespace */
+ir_visitor_status
+ir_algebraic_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 or precise variable, just bail.
+ * Most of the algebraic optimizations aren't precision-safe.
+ */
+ return visit_continue_with_parent;
+ } else {
+ return visit_continue;
+ }
+}
+
static inline bool
is_vec_zero(ir_constant *ir)
{
--
2.5.0.400.gff86faf
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