Olivier Hainque <[EMAIL PROTECTED]> writes: > Hello, > > PPC EABI targets are currently configured with both BIGGEST_ALIGNMENT and > PREFERRED_STACK_BOUNDARY set to 128, I believe to accomodate > > "a long double member within a structure or union shall start at the lowest > available offset aligned on a 16byte boundary"
BIGGEST_ALIGNMENT is 128 for a number of reasons, but PREFERRED_STACK_BOUNDARY is 128 primarily so that code compiled with -meabi can also be used on Linux and other SVR4 targets, and for Altivec support. > Now, I'm a bit unclear on the meaning of the ABI statement quoted above, and > on the real implications this should have in the compiler. > > Does it imply that a long double field *address* should always be a multiple > of 16, or just that the *offset* should be such a multiple ? It says offset, so it probably means offset.
