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[Qemu-devel] [Bug 1594069] Re: SIMD instructions translated to scalar ho
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [Bug 1594069] Re: SIMD instructions translated to scalar host instructions |
Date: |
Fri, 03 Nov 2017 16:32:51 -0000 |
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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https://bugs.launchpad.net/bugs/1594069
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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