Intel® Streaming SIMD Extensions

Penalties in SSE4

Hi,

Is there any penalties with in Intel SSE4?

Read in some document like accessing the partial register data from XMM register and from GPRs will cause some penalty.

Is there any document to understand better on the Data transfer penalties among the SSE registers.

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  • TSX with Haswell-E

    Are there any known motherboard and bios versions that allow me to develop using TSX with Haswell-E?

    Or, has the Haswell-E already had TSX permanently disabled?

    Or, has no disabling taken place yet at all?

    I really want to know so I can decide what to purchase.

    Thanks

    Performance penalty for mixed AVX512 code?

    There is a known performance penalty for mixing AVX with legacy code on today's Haswell processors.

    • Will this same problem exist in the Skylake chips and AVX512?
    • Will the delay be even longer for the ZMMs, since there are twice as many to save & restore and they are twice as long?
    • The workaround instruction for this, VZEROUPPER, is not listed as changed in Intel's Instruction Extensions manual. Won't there be changes like zeroing the high portion of the ZMM register?

    This is documented by Intel:

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