On Wed, Nov 2, 2011 at 6:09 PM, Hatanaka, Akira <[email protected]> wrote:
> Yes, that should be 40-bits.
>
> The structure with sub-doubleword fields was needed to handle packed
> structures whose size is not a multiple of 64. When I test it with the
> program below, a full double word load is used to load the last field of
> struct S4 instead of a byte load. Is this legal? It seems incorrect to me to
> load from a memory location outside the global g2.
Oh, I see... no, that's not legal (at least, not in the general case).
x86-64 uses a trick to get around this for cases like "struct { char
x[13]; }": the last parameter has the type i40.
-Eli
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