softfloat deals with doing the basic IEEE ops (add, subtract, multiply,
etc) at the correct 80 bit precision, but it doesn't provide
implementations of the x87's more complex operations (sin, cos, log,
etc), so QEMU is still doing those by converting from 80 bit to host
double and using the host C
I had a brief look at softfloat. In principle, it should fix the
issue, but only if the FPU uses 80-bit double-extended-precision
internally. I guess the qemu FPU is still stuck at 64 bit double
internally and that does not cut it for some calculations.
Just to be sure, I re-tested the code from
Looks like your test code from comment #1 still prints out a wrong
value, so the bug has apparently not been fixed by the FPU updates...
** Changed in: qemu
Status: Incomplete => Triaged
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Hi,
I just tried for about 2 hours without success or getting any useful
diagnostic to compile and run current qemu 2.8. No console,
no window opens, -curses does not work in .configure, despite
ncurses-dev being installed, etc.
Quite frankly, as I have not used qemu for several years now,
I c
Can you still reproduce this problem with the latest version of QEMU? As
far as I know, the FPU emulation has been completely switched to
softfloat with the latest versions, so I assume your problem might be
fixed in recent releases...
** Changed in: qemu
Status: New => Incomplete
--
You
And I unexpectedly had more time to dig.
Findings:
- asinh() is not in IEEE754, please ignore my comment about
non-conformity, sorry.
- The calculation for asinh() is pretty badly conditioned, i.e.
it blows up errors in the basic calculations.
- asinh() is implemented in glibc in as
Just found time to look a bit deeper into this. The problem is in the (real)
asinh() function.
I think it is possible that somewhere a calculation was done in float instead
of double or a double value was shortened to float.
Please note that until this is fixed, qemu i386 is not IEEE754 conform.
Forgot so say: This is still present in 0.13.0.
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Python 3.1.2 math errors with Qemu 0.12.5
https://bugs.launchpad.net/bugs/645662
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Status in QEMU: New
Bug description:
When doing the reg
