[Bug 1851095] Re: [feature request] awareness of instructions that are well emulated

[Aleksandar Markovic]

Can you provide a clearer repro example of what doesn't wirk on mipsel
platform?

In last two QEMU releases mips (Wave) developers went to great lenghts
making sure both mips SIMD and mips FP instructions (in both scalar and
vector variants) are emulated properly. Some of the unit tests were
published, but also many were left internal, and there are many
integration tests devised and run as well. We in mips (Wave) consider
these two areas well tested. Still, we'll consider seriuosly fixing your
example, if you prove experimentally that this is a mips-related bug,
but just provides us with a reasonably convenient repro procedure.

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https://bugs.launchpad.net/bugs/1851095

Title:
  [feature request] awareness of instructions that are well emulated

Status in QEMU:
  Invalid

Bug description:
  While qemu's scalar emulation tends to be excellent, qemu's SIMD
  emulation tends to be incorrect (except for arm64 from x86_64)--i have
  found this both for mipsel and arm32. Until these code paths are
  audited, which is probably a large job, it would be nice if qemu knew
  its emulation of this class of instructions was not very good, and
  thus it would give up on finding these instructions if a "careful"
  operation is passed.

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