diff options
| -rw-r--r-- | src/glsl/opt_constant_folding.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/glsl/opt_constant_folding.cpp b/src/glsl/opt_constant_folding.cpp index 74b855e5e94..4aae3f0ddf2 100644 --- a/src/glsl/opt_constant_folding.cpp +++ b/src/glsl/opt_constant_folding.cpp @@ -50,6 +50,7 @@ public: /* empty */ } + virtual ir_visitor_status visit_enter(ir_discard *ir); virtual ir_visitor_status visit_enter(ir_assignment *ir); virtual ir_visitor_status visit_enter(ir_call *ir); @@ -94,6 +95,29 @@ ir_constant_folding_visitor::handle_rvalue(ir_rvalue **rvalue) } ir_visitor_status +ir_constant_folding_visitor::visit_enter(ir_discard *ir) +{ + if (ir->condition) { + ir->condition->accept(this); + handle_rvalue(&ir->condition); + + ir_constant *const_val = ir->condition->as_constant(); + /* If the condition is constant, either remove the condition or + * remove the never-executed assignment. + */ + if (const_val) { + if (const_val->value.b[0]) + ir->condition = NULL; + else + ir->remove(); + this->progress = true; + } + } + + return visit_continue_with_parent; +} + +ir_visitor_status ir_constant_folding_visitor::visit_enter(ir_assignment *ir) { ir->rhs->accept(this); |