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Re: [Qemu-devel] [PATCH] softfloat: don't execute ppc64 ISA 3.0B instruc
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH] softfloat: don't execute ppc64 ISA 3.0B instruction if it is not supported |
Date: |
Thu, 1 Nov 2018 19:52:22 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
On 11/1/18 5:38 PM, Laurent Vivier wrote:
> commit 27ae5109a2 has introduced an assembly instruction only supported
> by ISA 3.0B and it fails to execute on previous versions of the POWER
> CPU (like PowerPC G5).
>
> This patch fixes that by checking the ISA level, and falls back to
> the default C function if the instruction is not supported.
>
> Fixes: 27ae5109a2ba8b6b679cce3e03e16570a34390a0
> (softfloat: Specialize udiv_qrnnd for ppc64)
> Signed-off-by: Laurent Vivier <address@hidden>
> ---
> include/fpu/softfloat-macros.h | 39 ++++++++++++++++++++--------------
> 1 file changed, 23 insertions(+), 16 deletions(-)
Blah. The divdeu insn was added into v2.06.
I knew I had tested this with a power7 host, which I think of as old.
But I guess not old enough. I'll work something up.
r~