From: Richard Henderson <rth@twiddle.net>
To: Tom Musta <tommusta@gmail.com>,
qemu-devel@nongnu.org, qemu-ppc@nongnu.org
Cc: agraf@suse.de
Subject: Re: [Qemu-devel] [PATCH 1/8] target-ppc: Bug Fix: rlwinm
Date: Fri, 15 Aug 2014 08:34:12 -1000 [thread overview]
Message-ID: <53EE52A4.70806@twiddle.net> (raw)
In-Reply-To: <1407785009-6538-2-git-send-email-tommusta@gmail.com>
On 08/11/2014 09:23 AM, Tom Musta wrote:
> The rlwinm specification includes the ROTL32 operation, which is defined
> to be a left rotation of two copies of the least significant 32 bits of
> the source GPR.
>
> The current implementation is incorrect on 64-bit implementations in that
> it rotates a single copy of the least significant 32 bits, padding with
> zeroes in the most significant bits.
Yes, it does describe rotate_32 as a double-copy of the low 32 bits. But it
also describes the mask as having "0 bits elsewhere". Thus, post mask, I don't
see how you could distinguish the implementations.
Have you an example that doesn't work with the current code?
r~
next prev parent reply other threads:[~2014-08-15 18:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-11 19:23 [Qemu-devel] [PATCH 0/8] target-ppc: Bug Fixes for 64 Bit FXU Instructions Tom Musta
2014-08-11 19:23 ` [Qemu-devel] [PATCH 1/8] target-ppc: Bug Fix: rlwinm Tom Musta
2014-08-15 18:34 ` Richard Henderson [this message]
2014-08-15 19:52 ` Richard Henderson
2014-08-11 19:23 ` [Qemu-devel] [PATCH 2/8] target-ppc: Bug Fix: rlwnm Tom Musta
2014-08-15 19:54 ` Richard Henderson
2014-08-11 19:23 ` [Qemu-devel] [PATCH 3/8] target-ppc: Bug Fix: rlwimi Tom Musta
2014-08-15 20:05 ` Richard Henderson
2014-08-18 19:51 ` Tom Musta
2014-08-11 19:23 ` [Qemu-devel] [PATCH 4/8] target-ppc: Bug Fix: mullw Tom Musta
2014-08-15 20:07 ` Richard Henderson
2014-08-11 19:23 ` [Qemu-devel] [PATCH 5/8] target-ppc: Bug Fix: mullwo Tom Musta
2014-08-15 20:11 ` Richard Henderson
2014-08-11 19:23 ` [Qemu-devel] [PATCH 6/8] target-ppc: Bug Fix: mulldo OV Detection Tom Musta
2014-08-15 20:16 ` Richard Henderson
2014-08-11 19:23 ` [Qemu-devel] [PATCH 7/8] target-ppc: Bug Fix: srawi Tom Musta
2014-08-11 19:23 ` [Qemu-devel] [PATCH 8/8] target-ppc: Bug Fix: srad Tom Musta
2014-08-15 20:17 ` Richard Henderson
2014-08-12 3:06 ` [Qemu-devel] [PATCH 0/8] target-ppc: Bug Fixes for 64 Bit FXU Instructions David Gibson
2014-08-12 11:40 ` Tom Musta
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