https://bugs.freedesktop.org/show_bug.cgi?id=66806
j...@openbsd.org changed:
What|Removed |Added
CC||j...@openbsd.org
--- Comment #11 from
https://bugs.freedesktop.org/show_bug.cgi?id=66806
Roland Scheidegger changed:
What|Removed |Added
Status|NEW |RESOLVED
Resolution|---
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #9 from Vinson Lee ---
I can reproduce this bug with gcc 4.4.7 on CentOS 6, gcc 4.6.3 on Ubuntu 12.04,
gcc 4.7.3 on Ubuntu 13.04, and gcc 4.8.1 on Ubuntu 13.10.
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https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #8 from Roland Scheidegger ---
Vinson,
this looks like a compiler issue to me, what compiler are you using? I suspect
something funky might be going on when setting/getting mxcsr value. A
disassembly of draw_vbo() where these are set
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #7 from Roland Scheidegger ---
(In reply to comment #6)
> (gdb) info registers mxcsr
> mxcsr 0x8060 [ PE DAZ FZ ]
Hmm that is just crazy, somehow all exceptions got unmasked and we get a
precision exception (which is really u
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #6 from Vinson Lee ---
Program received signal SIGFPE, Arithmetic exception.
0x74d4b21f in micro_mul (dst=0x7fffd270, src0=0x7fffd250,
src1=0x7fffd260) at tgsi/tgsi_exec.c:983
983 dst->f[0] = src0->f[0]
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #5 from Roland Scheidegger ---
Vinson,
since I can't reproduce this here could you do a "info registers mxcsr"? I'm
curious what the exception mask actually is. Also, what are the src0->f[0] and
src1->f[0] values?
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Vinson Lee changed:
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CC||jfons...@vmware.com,
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https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #3 from Roland Scheidegger ---
(In reply to comment #2)
> Indeed
> http://software.intel.com/en-us/articles/x87-and-sse-floating-point-assists-
> in-ia-32-flush-to-zero-ftz-and-denormals-are-zero-daz
>
> suggests to mask certain exc
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #2 from José Fonseca ---
Indeed
http://software.intel.com/en-us/articles/x87-and-sse-floating-point-assists-in-ia-32-flush-to-zero-ftz-and-denormals-are-zero-daz
suggests to mask certain exceptions together with the FTZ/DAZ bits:
https://bugs.freedesktop.org/show_bug.cgi?id=66806
--- Comment #1 from Roland Scheidegger ---
I can't reproduce this here for some reason.
That said I think we should probably manipulate mxcsr a bit more, in particular
we should explicitly disable all exceptions (they are disabled by default but
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