[Bug 1863247] Re: AArch64 EXT instruction for V register does not clear MSB side bits

[Richard Henderson]

Yep.

** Changed in: qemu
       Status: New => In Progress

** Changed in: qemu
     Assignee: (unassigned) => Richard Henderson (rth)

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https://bugs.launchpad.net/bugs/1863247

Title:
  AArch64 EXT instruction for V register does not clear MSB side bits

Status in QEMU:
  In Progress

Bug description:
  On AArch64 CPU with SVE register, there seems to be a bug in the
  operation when executing EXT instruction to V registers. Bits above
  the 128 bits of the SVE register must be cleared to 0, but qemu-
  aarch64 seems to hold the value.

  Example
  ext v0.16b, v1.16b v2.16b, 8

  After executing above instruction, (N-1) to 128 bits of z0 register
  must be 0, where N is SVE register width.

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