[Qemu-devel] [Bug 1594069] Re: SIMD instructions translated to scalar host instructions

[Peter Maydell]

Closing this because it isn't a bug. (It looks like some of the vector
TCG improvements are now in progress and might hit master for 2.12; but
in any case having an open bug in the system about this serves no useful
purpose.)


** Changed in: qemu
       Status: Confirmed => Invalid

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Title:
  SIMD instructions translated to scalar host instructions

Status in QEMU:
  Invalid

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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