static void DrsCalibrate::ApplyCh ( float *  vec, const int16_t *  val, int16_t  start, uint32_t  roi, const int32_t *  offset, const int64_t  scaleabs, const int64_t *  gain, const int64_t  scalegain  )

inlinestatic

Definition at line 294 of file DrsCalib.h.

References start().

Referenced by DrsCalibration::Apply().

    {
        if (start<0)
        {
            memset(vec, 0, roi);
            return;
        }
        /*
        for (size_t i=0; i<roi; i++)
        {
            // Value is relative to trigger
            // Offset is relative to DRS pipeline
            // Abs is corresponding index relative to DRS pipeline
            const size_t abs = (start+i)%1024;

            const int64_t v =
                + int64_t(val[i])*scaleabs-offset[abs]
                ;

            const int64_t div = gain[abs];
            vec[i] = div==0 ? 0 : double(v)*scalegain/div;
        }
        */

        // This version is faster because the compilers optimization
        // is not biased by the evaluation of %1024
        // (Here we are dominated by numerics... improvement ~10%)
        const int32_t *poffset = offset + start; // offset[abs]
        const int64_t *pgain   = gain   + start; // gain[abs]
        const int16_t *pval    = val;            // val[rel]
        float         *pvec    = vec;            // vec[rel]

        if (start+roi>1024)
        {
            while (poffset<offset+1024)
            {
                const int64_t v =
                    + int64_t(*pval++)*scaleabs - *poffset++
                    ;

                *pvec++ = *pgain==0 ? 0 : double(v)*scalegain / *pgain;

                pgain++;
            }

            poffset = offset;
            pgain   = gain;
        }

        while (pvec<vec+roi)
        {
            const int64_t v =
                + int64_t(*pval++)*scaleabs - *poffset++
                ;

            *pvec++ = *pgain==0 ? 0 : double(v)*scalegain / *pgain;

            pgain++;
        }
    }

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