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[Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8

From: Christophe Lyon
Subject: [Qemu-devel] [Bug 1590336] Re: qemu-arm does not reject vrintz on non-v8 cpu
Date: Thu, 09 Jun 2016 19:14:17 -0000

I confirm your patch does fix the problem.

You may still want to fix the disassembler such that it dumps the right
instruction, but that would be a separate fix.

Thanks for your quick support.

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  qemu-arm does not reject vrintz on non-v8 cpu

Status in QEMU:

Bug description:

  It seems that qemu-arm does not reject some v8-only instructions as it
  should, but executes them "correctly".

  For instance, while compiling/running some of the GCC ARM instrinsics tests, 
we noticed that
  vrintz should be rejected on cortex-a9 for instance, while it is executed as 
if the instruction was supported.

  objdump says:
     1074c:       f3fa05a0        vrintz.f32      d16, d16
  and qemu -d in_asm says:
  0x0001074c:  f3fa05a0      vabal.u<illegal width 64>    q8, d26, d16

  The problem is still present in qemu-2.6.0

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