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List:       qemu-devel
Subject:    [Qemu-devel] [Bug 1594069] [NEW] SIMD instructions translated to scalar host instructions
From:       Timothy Pearson <kb9vqf () pearsoncomputing ! net>
Date:       2016-06-19 5:33:25
Message-ID: 20160619053325.24903.2985.malonedeb () gac ! canonical ! com
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Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

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

Title:
  SIMD instructions translated to scalar host instructions

Status in QEMU:
  New

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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