Messages in this thread | | | From | Keith Owens <> | Subject | Re: [PATCH][2.6] IBM PowerPC Virtual Ethernet Driver | Date | Wed, 18 Feb 2004 15:19:36 +1100 |
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On Wed, 18 Feb 2004 11:45:20 +1100, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: >BITFIELDS ARE EVIL !!! >The compiler is perfectly free, afaik, to re-order them
Not it is not. C standard (ISO/IEC 9899:1999 (E)), section 6.7.2.1.
10 ... If enough space remains, a bit-field that immediately follows another bit-field in a structure shall be packed into adjacent bits of the same unit. ...
13 Within a structure object, the non-bit-field members and the units in which bit-fields reside have addresses that increase in the order in which they are declared. ...
There is no scope for a compiler to reorder the members or the bit fields of a structure.
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