Date: Sat, 14 Aug 2021 14:07:34 +1000 (AEST) From: Damian McGuckin <damianm@....com.au> To: musl@...ts.openwall.com Subject: Re: [PATCH #2] Properly simplified nextafter() On Fri, 13 Aug 2021, Stefan Kanthak wrote: >> It may be possible to reduce the number of such ops too; not sure. But >> there's no way to eliminate them. Replacing the second FORCE'd expression with FORCE((ux.f + x) * (0x1.0p-52 * 0.25)); eliminates one floating point OP, assuming the optimiser does the right thing to epsilon / 4 in the expression. Some preliminary testing seems to suggest that the same exceptions get raised. > It's definitely possible to do a strength reduction and get rid of the > multiplications. But then how is the exception still raised, or are we talking soft FP? Stay safe - Damian
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