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On 06/27/2016 08:29 PM, H.J. Lu wrote:
If ld.so doesn't the first 8 save/store ZMM registers, you may not pass parameters in ZMM registers with AVX512 kernel on AVX512 machine. We wan to make sure that ld.so in x86-64 glibc saves/stores ZMM registers unless glibc is configured to disable AVX512 support.
I still do not understand what is going on.What can clobber the ZMM registers if glibc was compiled without AVX-512 capabilities?
If ld.so support for AVX512 is a must before applications can use it, why has this not been built into the platform capability detection mechanism?
Thanks, Florian
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