From: Simon Wright <simon@pushface.org>
Subject: Re: Best representation for spares
Date: Fri, 14 Feb 2014 09:19:20 +0000
Date: 2014-02-14T09:19:20+00:00 [thread overview]
Message-ID: <lyvbwicaqv.fsf@pushface.org> (raw)
In-Reply-To: 215f6df2-a7ec-42f4-ac82-656d5b12bf61@googlegroups.com
"Rego, P." <pvrego@gmail.com> writes:
> using this kind of definitions, the compiler warns (correctly) me
> warning: 29-bit gap before component "AUX_ENABLES"
I'd much prefer to fill this space. And, on the whole, better with zeros
(unless, of course, 'unused' means 'don't even write to this bit').
Something like
type Zero_Bit is range 0 .. 0;
type Zero_Bits is array (Positive range <>) of Zero_Bit;
for Zero_Bits'Component_Size use 1;
type Auxiliary_Interrupt_Status_Type is
record
Mini_Uart_IRQ : Boolean;
SPI_1_IRQ : Boolean;
SPI_2_IRQ : Boolean;
Spare : Zero_Bits (3 .. 31);
end record;
pragma Pack (Auxiliary_Interrupt_Status_Type);
for Auxiliary_Interrupt_Status_Type'Size use 32;
next prev parent reply other threads:[~2014-02-14 9:19 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-14 1:07 Best representation for spares Rego, P.
2014-02-14 9:19 ` Simon Wright [this message]
2014-02-15 16:06 ` Rego, P.
2014-02-15 17:49 ` Jeffrey Carter
2014-02-15 20:21 ` Rego, P.
2014-02-15 19:55 ` Niklas Holsti
2014-02-15 20:25 ` Rego, P.
2014-02-15 21:35 ` Rego, P.
2014-02-16 10:02 ` Niklas Holsti
2014-02-16 13:40 ` Rego, P.
2014-02-16 16:26 ` Rego, P.
2014-02-16 18:50 ` Niklas Holsti
2014-02-16 16:33 ` Niklas Holsti
2014-02-16 12:10 ` Simon Wright
2014-02-16 13:43 ` Rego, P.
2014-02-16 14:25 ` Robert A Duff
2014-02-16 16:21 ` Rego, P.
2014-02-15 21:41 ` Jeffrey Carter
2014-02-15 22:37 ` Rego, P.
2014-02-15 22:41 ` Rego, P.
2014-02-16 0:39 ` Jeffrey Carter
2014-02-16 12:06 ` Simon Wright
2014-02-16 13:45 ` Rego, P.
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