[Mesa-dev] [PATCH 2/6] glsl: Optimize log(exp(x)) and exp(log(x)) into x.

[Erik Faye-Lund]

On Mon, Jan 20, 2014 at 8:18 AM, Eric Anholt <eric at anholt.net> wrote:
> ---
>  src/glsl/opt_algebraic.cpp | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>
> diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
> index 6b0d992..4aa49e5 100644
> --- a/src/glsl/opt_algebraic.cpp
> +++ b/src/glsl/opt_algebraic.cpp
> @@ -252,6 +252,42 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
>        }
>        break;
>
> +   case ir_unop_exp:
> +      if (op_expr[0] == NULL)
> +        break;

How can this happen?!