[Mesa-dev] [PATCH 1/6] glsl: Optimize ~~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 | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
> index 332f0b7..6b0d992 100644
> --- a/src/glsl/opt_algebraic.cpp
> +++ b/src/glsl/opt_algebraic.cpp
> @@ -218,6 +218,18 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
>        this->mem_ctx = ralloc_parent(ir);
>
>     switch (ir->operation) {
> +   case ir_unop_bit_not:
> +      if (op_expr[0] == NULL)
> +        break;

How can this happen?!