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List:       qemu-devel
Subject:    [Qemu-devel] [Bug 1594069] Re: SIMD instructions translated to scalar host instructions
From:       Timothy Pearson <kb9vqf () pearsoncomputing ! net>
Date:       2016-06-20 14:05:29
Message-ID: 20160620140529.24292.37870.malone () gac ! canonical ! com
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I mostly filed the bug report since I was seeing multiple different
attempts to implement this, and even a proper patch series on the
mailing list, but no movement at all toward integrating this feature
into mainline qemu.

What would be needed to e.g. make the patch series on the mailing list
acceptable for merge?

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https://bugs.launchpad.net/bugs/1594069

Title:
  SIMD instructions translated to scalar host instructions

Status in QEMU:
  Confirmed

Bug description:
  SIMD instructions inside the guest (NEON, MMX, SSE, SSE2, AVX) are
  translated to scalar instructions on the host instead of SIMD
  instructions.  It appears that there have been a few efforts to
  rectify this [1], and even a submitted patch series, but all
  discussion has effectively died out [2].

  I would like to see better SIMD performance on qemu, especially as
  non-x86 architectures are becoming widely used (e.g. ARM).

  [1] http://dl.acm.org/citation.cfm?id=2757098&dl=ACM&coll=DL&CFID=633095244&CFTOKEN=12352103
  [2] https://lists.nongnu.org/archive/html/qemu-devel/2014-10/msg01720.html

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