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QEMU emulation of fmadds instruction on powerpc64le is buggy
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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