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

[Shawn Landden]

example binary doing double-precision exponent on 16 megs

expected output:

checksum: f181b401cd42aa7b

actual output:

checksum: 4004022b0ba624fb


** Attachment added: "bench_simple"
   
https://bugs.launchpad.net/qemu/+bug/1851095/+attachment/5302817/+files/bench_simple

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

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

Status in QEMU:
  New

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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