diff options
| -rw-r--r-- | src/compiler/glsl/opt_algebraic.cpp | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/compiler/glsl/opt_algebraic.cpp b/src/compiler/glsl/opt_algebraic.cpp index 1e58062cb0d..f5858c83865 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 +82,23 @@ 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. + * + * FINISHME: Find out which optimizations are precision-safe and enable + * then only for invariant or precise trees. + */ + return visit_continue_with_parent; + } else { + return visit_continue; + } +} + static inline bool is_vec_zero(ir_constant *ir) { |