Re: BITS_PER_UNIT larger than 8 -- word addressing

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BITS_PER_UNIT larger than 8 -- word addressing
\ Michael Eager (27 Nov 2007)
. \ (Ross Ridge) (27 Nov 2007)
. . \ Michael Eager (27 Nov 2007)
. . . \ Richard Sandiford (27 Nov 2007)
. . . \ Joseph S. Myers (27 Nov 2007)
. . . . \ Michael Eager (27 Nov 2007)
. . . . . \ Joseph S. Myers (27 Nov 2007)
. . . . . . \ Michael Eager (27 Nov 2007)
. . . . . . . \ Michael Eager (1 Dec 2007)
. . . . . . . . \ Joseph S. Myers (1 Dec 2007)
. \ Boris Boesler (5 Dec 2007)
. . \ Ian Lance Taylor (5 Dec 2007)
. . . \ Boris Boesler (7 Dec 2007)
. . . . \ Ian Lance Taylor (7 Dec 2007)

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Subject:	Re: BITS_PER_UNIT larger than 8 -- word addressing
Group:	Gcc
From:	Michael Eager
Date:	27 Nov 2007

Joseph S. Myers wrote:
> On Tue, 27 Nov 2007, Michael Eager wrote:
>
>> I think that there is a pervasive understanding that SImode is
>> single precision integer, 32-bits long.
>
> Only among contributors not considering non-8-bit bytes. SImode is 4
> times QImode, 4*BITS_PER_UNIT bits, and may not exist (or at least not be
> particularly usable, much like the limitations on TImode on 32-bit
> targets) with large BITS_PER_UNIT.

I think you just described the majority of contributors. :-)

It's human nature not to recognize one's tacit assumptions or their
consequences. It's also normal for people to focus on what they are
working on and pay far less attention to other targets. Since there
is no working and supported 32-bit word-addressed target, there's
little to alert anyone that one of their assumptions is not valid.

It may be that my current problem is limited to unwind-dw2.c.
If so, then I may be able to work around it by simply not building it.

--
Michael Eager eager
1960 Park Blvd., Palo Alto, CA 94306 650-325-8077