[Mesa-dev] [PATCH 3/5] glsl: Recognize sat(add(b2f(a), b2f(b))) as a logical OR.

[Ian Romanick]

Did this patch help anything?

On 03/18/2015 11:37 AM, Matt Turner wrote:
> Transform this into b2f(or(a, b)).
> ---
>  src/glsl/opt_algebraic.cpp | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
> index 0d1f3fc..98c852a 100644
> --- a/src/glsl/opt_algebraic.cpp
> +++ b/src/glsl/opt_algebraic.cpp
> @@ -421,6 +421,18 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
>        break;
>     }
>  
> +   case ir_unop_saturate:
> +      if (op_expr[0] && op_expr[0]->operation == ir_binop_add) {
> +         ir_expression *b2f_0 = op_expr[0]->operands[0]->as_expression();
> +         ir_expression *b2f_1 = op_expr[0]->operands[1]->as_expression();
> +
> +         if (b2f_0 && b2f_0->operation == ir_unop_b2f &&
> +             b2f_1 && b2f_1->operation == ir_unop_b2f) {
> +            return b2f(logic_or(b2f_0->operands[0], b2f_1->operands[0]));
> +         }
> +      }
> +      break;
> +
>     case ir_binop_add:
>        if (is_vec_zero(op_const[0]))
>  	 return ir->operands[1];
>