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Mali Offline compiler GLSL clamp performance on Mali-Gxx

dbe_dev

Hi,

Been doing some analysis on some GLSL shader programs with the Mali Offline Compiler, great program btw.

It is however reporting that a clamp (vec3,float,float) is somehow slower for the Mali-Gxx than doing a seperate min/max according the offline compiler.

vec3 clamp_minmax (vec3 val, float minimum, float maximum){
    return clamp(val, minimum, maximum);
}

vs

vec3 clamp_minmax (vec3 val, float minimum, float maximum){
   vec3 rval = min(val, maximum);
   return max (rval, minimum);
}

Note that the minimum is a constant 0.0f.

Is this expected and correct for a Mali-Gxx ?

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  • +1 Arm Employee Badge in reply to dbe_dev

    The absolute numbers for the G series are incorrect (at least for the arithmetic cost) - we'll be fixing this in the next offline compiler release later in the year. The trend direction in terms of is it getting faster or slower should be accurate though, to the best of my knowledge.

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  • +1 Arm Employee Badge in reply to dbe_dev

    The absolute numbers for the G series are incorrect (at least for the arithmetic cost) - we'll be fixing this in the next offline compiler release later in the year. The trend direction in terms of is it getting faster or slower should be accurate though, to the best of my knowledge.

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