Date: Tue, 14 Jan 2020 22:53:41 +0300 (MSK) From: Alexander Monakov <amonakov@...ras.ru> To: musl@...ts.openwall.com Subject: Re: Q: dealing with missing removal of excess precision On Tue, 14 Jan 2020, Rich Felker wrote: > > otoh it would be nice if there was a way to tell the compiler not to > > remove it (e.g. in case the asm already took care of it) even in c99 > > standard mode. > > Perhaps this happens if the output constraint is tied to a float > rather than a long double? Precisely. That's what previously posted patches do, and they match existing hand-tuned assembly. I misspoke when saying that Glibc might return a value with excess precision. I was looking at fmod-like functions and missed a slightly subtle point that fprem does not introduce excess precision. So I don't actually have any example where Glibc might misbehave in that regard. Alexander
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