From: "Maciej W. Rozycki" <macro@linux-mips.org>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Jayachandran C <jchandra@broadcom.com>, linux-mips@linux-mips.org
Subject: Re: [PATCH UPDATED 4/4] MIPS: Move definition of SMP processor id register to header file
Date: Thu, 20 Jun 2013 16:40:59 +0100 (BST) [thread overview]
Message-ID: <alpine.LFD.2.03.1306201630180.29828@linux-mips.org> (raw)
In-Reply-To: <20130620144821.GB30061@linux-mips.org>
On Thu, 20 Jun 2013, Ralf Baechle wrote:
> So I've removed it again for now.
>
> Maciej, I wonder why does gas in MIPS III/IV mode accept
>
> dmfc0 $reg1, $cp0reg
>
> but not
>
> dmfc0 $reg1, $cp0reg, 0
>
> The generated code is the same after all. Same for MIPS I/II mode and
> mfc0.
The <sel> operand and instruction field was only added to these
instructions with the MIPS64 ISA (MIPS32 ISA for MFC0/MTC0). Previously
processors did not decode this field and consequently the assembler
notation only supports two operands.
Since AFAICT the offending pieces are macros I suggest simply dumping the
redundant ", 0" part, the two-argument form is as you've observed
equivalent.
Maciej
next prev parent reply other threads:[~2013-06-20 15:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-11 15:41 [PATCH 0/4] Use scratch registers on XLR/XLS/XLP Jayachandran C
2013-06-11 15:41 ` [PATCH 1/4] MIPS: Allow platform specific scratch registers Jayachandran C
2013-06-11 15:41 ` [PATCH 2/4] MIPS: Fixup check for invalid scratch register Jayachandran C
2013-06-11 15:41 ` [PATCH 3/4] MIPS: mm: Use scratch for PGD when !CONFIG_MIPS_PGD_C0_CONTEXT Jayachandran C
2013-06-18 12:45 ` [PATCH UPDATED " Jayachandran C
2013-06-18 12:45 ` [PATCH UPDATED 4/4] MIPS: Move definition of SMP processor id register to header file Jayachandran C
2013-06-20 14:48 ` Ralf Baechle
2013-06-20 15:40 ` Maciej W. Rozycki [this message]
2013-06-20 15:19 ` [PATCH UPDATED 3/4] MIPS: mm: Use scratch for PGD when !CONFIG_MIPS_PGD_C0_CONTEXT Ralf Baechle
2013-06-11 15:41 ` [PATCH 4/4] MIPS: Move definition of SMP processor id register to header file Jayachandran C
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