|Bill Allombert on Wed, 01 Feb 2012 00:46:43 +0100|
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|automatic 'return' elimination|
Dear PARI developers, We discovered that the return() function was slow with large input: ? bnf=vector(100,i,vector(200,j,i+j)); ? fun0(bnf)=bnf; ? fun1(bnf)=return(bnf); ? my(bnf=bnf);for(i=1,10^5,fun0(bnf)) ? ## *** last result computed in 264 ms. ? my(bnf=bnf);for(i=1,10^5,fun1(bnf)) ? ## *** last result computed in 805 ms. So as a first step, I have commited a patch (41dd7b6) for the internal GP compiler that remove 'spurious' returns (like in fun1 above). Cheers, Bill.