From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 41Qzg439F3zF35s for ; Thu, 12 Jul 2018 12:00:48 +1000 (AEST) Message-ID: Subject: Re: [PATCH 1/3] selftests/powerpc: Remove Power9 copy_unaligned test From: Michael Neuling To: Michael Ellerman , linuxppc-dev@ozlabs.org Cc: chris@distroguy.com Date: Thu, 12 Jul 2018 12:00:47 +1000 In-Reply-To: <20180711071017.5128-1-mpe@ellerman.id.au> References: <20180711071017.5128-1-mpe@ellerman.id.au> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Wed, 2018-07-11 at 17:10 +1000, Michael Ellerman wrote: > This is a test of the ISA 3.0 "copy" instruction. That instruction has > an L field, which if set to 1 specifies that "the instruction > identifies the beginning of a move group" (pp 858). That's also > referred to as "copy first" vs "copy". >=20 > In ISA 3.0B the copy instruction does not have an L field, and the > corresponding bit in the instruction must be set to 1. >=20 > This test is generating a "copy" instruction, not a "copy first", and > so on Power9 (which implements 3.0B), this results in an illegal > instruction. >=20 > So just drop the test entirely. We still have copy_first_unaligned to > test the "copy first" behaviour. >=20 > Signed-off-by: Michael Ellerman Acked-by: Michael Neuling