On Sun, 10 Feb 2013, bodr...@mail.dm.unipi.it wrote:

I do not know if current gcc can optimise a loop like:
for (int i = 3; (i < 1 << 30) && mpz_gt_ui_p (z, i); i <<= 1) ;
but we give it the chance to.

You should use i*=2 instead of i<<=1 to maximize optimization opportunities. And then gcc does optimize this.

--
Marc Glisse
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