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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Test failures on 32 bit Mesa compiled with GCC 7.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104971#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Test failures on 32 bit Mesa compiled with GCC 7.x"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104971">bug 104971</a>
from <span class="vcard"><a class="email" href="mailto:currojerez@riseup.net" title="Francisco Jerez <currojerez@riseup.net>"> <span class="fn">Francisco Jerez</span></a>
</span></b>
<pre>(In reply to Mark Janes from <a href="show_bug.cgi?id=104971#c6">comment #6</a>)
<span class="quote">> The first failures I saw were:
> actual = packUnorm2x16(vec2(0.89999998, -1e+256));
>
> if (true
> && actual != 58982u
> ) {
> vert_color = red;
> }
>
> actual = packUnorm2x16(vec2(-1e+256, 0.89999998));
>
> if (true
> && actual != 3865444352u
> ) {
> vert_color = red;
> }
>
>
> are those examples of the same test issue?</span >
Yeah, they look bogus in the same way. The test only accepts 0xe666 as valid
encoding even though when doing the scaling with full x87 precision you'll get
a result around 0xe665.7f, which is actually slightly closer to 0xe665, so it
ends up being rounded down by the GLSL front-end which the test doesn't allow
as valid result.</pre>
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