[Bug 1912934] Re: QEMU emulation of fmadds instruction on powerpc64le is buggy

[Thomas Huth]

This is an automated cleanup. This bug report has been moved to QEMU's
new bug tracker on gitlab.com and thus gets marked as 'expired' now.
Please continue with the discussion here:

 https://gitlab.com/qemu-project/qemu/-/issues/312


** Changed in: qemu
       Status: New => Expired

** Bug watch added: gitlab.com/qemu-project/qemu/-/issues #312
   https://gitlab.com/qemu-project/qemu/-/issues/312

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https://bugs.launchpad.net/bugs/1912934

Title:
  QEMU emulation of fmadds instruction on powerpc64le is buggy

Status in QEMU:
  Expired

Bug description:
  The attached program test-fmadds.c tests the fmadds instruction on
  powerpc64le.

  Result on real hardware (POWER8E processor):
  $ ./a.out ; echo $?
  0

  Result in Alpine Linux 3.13/powerpcle, emulated by QEMU 5.0.0 on Ubuntu 16.04:
  $ ./a.out ; echo $?
  32

  Result in Debian 8.6.0/ppc64el, emulated by QEMU 2.9.0 on Ubuntu 16.04:
  $ ./a.out ; echo $?
  32

  Through 'nm --dynamic qemu-system-ppc64 | grep fma' I can see that
  QEMU is NOT using the fmaf() or fma() function from the host system's
  libc; this function is working fine in glibc of the host system (see
  https://www.gnu.org/software/gnulib/manual/html_node/fmaf.html ).

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