[Intel-gfx] [PATCH i-g-t 1/3] lib: Add swap() macro

[Jani Nikula]

On Fri, 05 Dec 2014, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> swap() will swap its two arguments while keeping the required
> tmp variable hidden. Makes for neater code.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  lib/igt_aux.h | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/lib/igt_aux.h b/lib/igt_aux.h
> index 6c83c53..63e1b06 100644
> --- a/lib/igt_aux.h
> +++ b/lib/igt_aux.h
> @@ -90,4 +90,10 @@ void intel_require_memory(uint32_t count, uint32_t size, unsigned mode);
>  #define min(a, b) ((a) < (b) ? (a) : (b))
>  #define max(a, b) ((a) > (b) ? (a) : (b))
>  
> +#define swap(a, b) do {		\
> +	typeof(a) _tmp = (a);	\
> +	(a) = (b);		\
> +	(b) = _tmp;		\
> +} while (0)

Nitpick, make the macro take pointers instead, and amend the cocci patch
accordingly? To a grumpy old C coder, swap(&a, &b) is so much more
obvious than swap(a, b)...

Jani.


> +
>  #endif /* IGT_AUX_H */
> -- 
> 2.0.4
>
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-- 
Jani Nikula, Intel Open Source Technology Center