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Article <20240917125248.00002a95@yahoo.com>
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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.arch
Subject: Re: Computer architects leaving Intel...
Date: Tue, 17 Sep 2024 12:52:48 +0300
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On Tue, 17 Sep 2024 11:42:47 +0200
Terje Mathisen <terje.mathisen@tmsw.no> wrote:

> Michael S wrote:
> > On Tue, 17 Sep 2024 08:20:15 +0200
> > Terje Mathisen <terje.mathisen@tmsw.no> wrote:
> >   
> >> EricP wrote:  
> >>> These double-width bit-field straddle operations show up at
> >>> 32-bits. Various FP64 formats (DEC's middle-endian FP being the
> >>> worst example), Intel page table entries and segment/gate
> >>> descriptors, come to mind.  
> >>
> >> Lots of them in 32-bit code!  
> > 
> > Lot's of what in 32-bit code?
> >   
> 
> Pretty much any 64-bit container with non-regular contents, with the 
> suggest double / fp64 as the classic example?
> 
> Terje
> 

You mean
struct { int a; double b; } where on 32-bit target we expect that b is
not padded? 
And then mantissa of b crosses 64-bit boundary?
But mantissa of b is not accessed as bit field in a typical program.