diff options
| -rw-r--r-- | src/glsl/opt_algebraic.cpp | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp index fae58c75c0e..7f25fc41886 100644 --- a/src/glsl/opt_algebraic.cpp +++ b/src/glsl/opt_algebraic.cpp @@ -578,9 +578,18 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir) if (!is_vec_zero(zero)) continue; - return new(mem_ctx) ir_expression(ir->operation, - add->operands[0], - neg(add->operands[1])); + /* Depending of the zero position we want to optimize + * (0 cmp x+y) into (-x cmp y) or (x+y cmp 0) into (x cmp -y) + */ + if (add_pos == 1) { + return new(mem_ctx) ir_expression(ir->operation, + neg(add->operands[0]), + add->operands[1]); + } else { + return new(mem_ctx) ir_expression(ir->operation, + add->operands[0], + neg(add->operands[1])); + } } break; |