On 22/02/2019 05:59, Richard Henderson wrote: > This requires VSX, not just Altivec, so Power7 or later. > > Signed-off-by: Richard Henderson <richard.hender...@linaro.org> > --- > > At present there are no tunables that can avoid the 64-bit element > load/store requirement. As with requiring AVX1 for x86 hosts, I'm > not sure it's worth inventing such a tunable for pre-power7 hosts. > > Tested vs aarch64 risu test cases. It's probably worth testing > this vs Mark's target/ppc conversion.
Oooh this looks really exciting! However... I only have a G4 Mac Mini around that I use for testing which is Altivec-only :( Is it much work to support non-VSX hosts? This leads me to a related point that came up when Howard and I were testing the PPC vector patches - how do we know at runtime which optimisations were being used, e.g. what is the value of have_avx2 on a particular CPU running QEMU? Under Linux this isn't too bad since you can just do "cat /proc/cpuinfo | grep avx2" but it becomes more tricky when getting bug reports from Windows users who aren't particularly technical... ATB, Mark.
