Re: bin/47301: Miscompilation by bundled GCC

[<Paul_Koning%Dell.com@localhost>]

On Dec 10, 2012, at 2:35 PM, David Laight wrote:

> The following reply was made to PR bin/47301; it has been noted by GNATS.
> 
> From: David Laight <david%l8s.co.uk@localhost>
> To: gnats-bugs%NetBSD.org@localhost
> Cc: 
> Subject: Re: bin/47301: Miscompilation by bundled GCC
> Date: Mon, 10 Dec 2012 19:48:40 +0000
> 
> On Mon, Dec 10, 2012 at 04:40:04PM +0000, Paul_Koning%Dell.com@localhost 
> wrote:
>> 
>> I wonder what that workaround would do to performance.
>> This sort of reload case could pop up in lots of machine
>> architectures -- any CISC-like machine might be affected.
>> pdp11, 68k, i386, ...
> 
> pdp11 is only 16bit.

True but it still sees SI operands.  For that matter, I'm assuming it could see 
the identical scenario if the arguments are HImode (which then matches its 
register size).

> i386 only allows one memory operand (except for special instructions
>     with fixed registers.
> m68k does allow memory-memory oparations (if I've read the book properly).