[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-ppc] [RFC PATCH 0/6] target/ppc: convert VMX instructions to u

From: BALATON Zoltan
Subject: Re: [Qemu-ppc] [RFC PATCH 0/6] target/ppc: convert VMX instructions to use TCG vector operations
Date: Tue, 11 Dec 2018 00:01:06 +0100 (CET)
User-agent: Alpine 2.21.9999 (BSF 287 2018-06-16)

On Mon, 10 Dec 2018, Richard Henderson wrote:
On 12/10/18 2:54 PM, BALATON Zoltan wrote:
Tried it on i5 650 which has: sse sse2 ssse3 sse4_1 sse4_2. I assume x86_64
should be supported but not sure what are the CPU requirements.

Not quite.  I only support avx1 and later.

I thought about supporting sse4 and later (that's the minimum with all of the
instructions that do what we need), but there is only one cpu generation with
sse4 and without avx1, and avx1 is already 8 years old.

OK that explains why I haven't seen any improvements. My CPU just predates AVX and happens to be in the generation you mention. But I agree this probably does not worth the effort. Maybe I should test on something newer instead.

Thank you,

reply via email to

[Prev in Thread] Current Thread [Next in Thread]