<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - lp_test_arit fails on non-sse41 capable machines, breaking make check" href="https://bugs.freedesktop.org/show_bug.cgi?id=59701#c2">Comment # 2</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - lp_test_arit fails on non-sse41 capable machines, breaking make check" href="https://bugs.freedesktop.org/show_bug.cgi?id=59701">bug 59701</a> from <a class="email" href="mailto:sroland@vmware.com" title="Roland Scheidegger <sroland@vmware.com>"> Roland Scheidegger</a> <pre>Hmm fract() is such a mess. The usual definition of fract(x) is sub(x) - floor(x), and it is expected this returns a number in [0,1[ except it doesn't actually work due to the funky float math (floor(verysmallnegnumber) is -1.0f (exact) and the subtraction will be 1.0f (exact) too). But here it must be floor which is busted, returning 0.0f. In particular ifloor without rounding available which already does a lot of work to fix results, but maybe the math doesn't quite work out around 0.0f. In particular I'm not really sure about that offset constant. Looks to me for denorms it would always be broken but apparently it fails for values further away from zero too. (The last two failures with very large numbers are quite expected too I guess as we're using fp-to-int and back and these values exceed the representable int range. I can't think of an easy workaround, probably doable with a couple comparisons, masks etc.)</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>