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From: Stafford Horne <shorne@gmail.com>
To: openrisc@lists.librecores.org
Subject: [OpenRISC] Fpu tininess
Date: Fri, 20 Mar 2020 16:21:14 +0900	[thread overview]
Message-ID: <CAAfxs75F6mcX_qHPYLzCbudeONXkSCOqNcXGRR4o+bgMDZ_VxQ@mail.gmail.com> (raw)

Hi Andrey,

Thanks for replying to the question about fusesoc.

I've been meaning to ask you a question about our fpu implementation.
Currently for glibc most  floating point math routines use 64-bit double
precision.  Anything not handled by the architecture is emulated.

I have written the emulation patches but the tests are having issues with
underflow flags being incorrectly set sometimes.

I have a hunch it may be due to my tininess setting.   Do you know what we
should set for:

_FP_TININESS_AFTER_ROUNDING

?

The glibc patch
https://github.com/openrisc/or1k-glibc/commit/4748177bdde92846974fc8ec523d212d6db74aa0

The gcc patch
https://github.com/stffrdhrn/gcc/commit/8e99e252edc130162b6d2d7bdef2180305389053
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             reply	other threads:[~2020-03-20  7:21 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20  7:21 Stafford Horne [this message]
2020-03-21 13:06 ` [OpenRISC] Fpu tininess Andrey Bacherov
2020-03-22  0:58   ` Stafford Horne
2020-07-25 11:13     ` Andrey Bacherov
2020-07-26 13:15       ` Stafford Horne

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