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Rev 77685 Rev 90186
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    double tmp1, tmp2;
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    double tmp1, tmp2;
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#ifdef IEEE_754
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#ifdef IEEE_754
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    if (ISNAN(x) || ISNAN(shape) || ISNAN(scale))
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    if (ISNAN(x) || ISNAN(shape) || ISNAN(scale))
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	return x + shape + scale;
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	return x + shape + scale;
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#endif
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#endif
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    if (shape <= 0 || scale <= 0) ML_WARN_return_NAN;
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    if (shape < 0 || scale <= 0) ML_WARN_return_NAN;
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    if (x < 0) return R_D__0;
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    if (x < 0) return R_D__0;
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    if (!R_FINITE(x)) return R_D__0;
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    if (!R_FINITE(x)) return R_D__0;
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    /* need to handle x == 0 separately */
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    /* need to handle x == 0 separately */
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    if(x == 0 && shape < 1) return ML_POSINF;
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    if(x == 0 && shape < 1) return ML_POSINF;