It would be great to know in more details how to get the fix mentioned
on an armhfl Ubuntu 12.10 (no, we cannot upgrade the system,
unfortunately).
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This seems to be fixed as far as I can tell building a static soft float binary
with the Linaro toolchain (which incidentally no longer supports soft float
from 4.9 onwards).
** Changed in: linaro-toolchain-misc
Status: New = Fix Released
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This is still a problem with 2.13-24ubuntu4.
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https://bugs.launchpad.net/bugs/713985
Title:
[armel] Function tgammal has precision issues in version
2.12.1-0ubuntu10.2 on ARM
To
This boils down to eglibc working with 8-byte floats on ARM, even if it's
declared long double.
To see this behaviour on x86, build and run the following:
#include stdio.h
#include math.h
int main ()
{
double x = 6.0;
printf(sizof(double)=%d\n,sizeof(double));
printf(lgamma
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: eglibc (Ubuntu)
Status: New = Confirmed
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Title:
** Tags added: arm-porting-queue armel
** Also affects: linaro-toolchain-misc
Importance: Undecided
Status: New
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Title:
[armel]
The bug is in fact in lgammal, as tgammal(x) simply takes expl(lgammal(x));
namely, lgammal(6.0) produces 4.78749174278204581157 on armel,
while it should be closer to 4.7874917427820459942477, i.e. armel gives
relative error of about 3.8e-17
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** Summary changed:
- Function tgammal has precision issues in version 2.12.1-0ubuntu10.2 on ARM
+ [armel] Function tgammal has precision issues in version 2.12.1-0ubuntu10.2
on ARM
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