diff options
| -rw-r--r-- | src/glsl/opt_algebraic.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index 448f27ed954..05a58998985 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -420,10 +420,11 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) if (op_expr[0] && op_expr[0]->operation == ir_unop_rcp) return op_expr[0]->operands[0]; - /* FINISHME: We should do rcp(rsq(x)) -> sqrt(x) for some - * backends, except that some backends will have done sqrt -> - * rcp(rsq(x)) and we don't want to undo it for them. + /* While ir_to_mesa.cpp will lower sqrt(x) to rcp(rsq(x)), it does so at + * its IR level, so we can always apply this transformation. */ + if (op_expr[0] && op_expr[0]->operation == ir_unop_rsq) + return sqrt(op_expr[0]->operands[0]); /* As far as we know, all backends are OK with rsq. */ if (op_expr[0] && op_expr[0]->operation == ir_unop_sqrt) { |