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Multiple comments in functions Double_Divide and Scaled_Divide were incorrect. Now fixed. Also change the expression (if Zhi /= 0 then Ylo * Zhi else 0) to the simpler equivalent (Ylo * Zhi) in Double_Divide. Also add a comment explaining why the implementation of Algorithm D for multiple-precision division from the 2nd Edition of The Art of Computer Programming does not suffer from two bugs discovered on that version. There is no impact on execution, hence no test. 2019-09-17 Yannick Moy <moy@adacore.com> gcc/ada/ * libgnat/s-arit64.adb (Double_Divide): Simplify needlessly complex computation. Fix comments. (Scaled_Divide): Fix comments. Explain why implementation does not suffer from bugs in Algorithm D from 2nd Edition of TAOCP. From-SVN: r275792
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