ABI voilation

[Andrew Haley]

Tim Prince writes:
 > kanishk rastogi wrote:
 > > hi all,
 > > I wanted to know if when i specify -O[0-3] flag to gcc does gcc
 > > optimize the code even violating ABI for that specific arch.
 > > If yes can i specify gcc not to violate the ABI ....
 > > I am mostly concerned witht he ABI specification which tells how to
 > > call another function..
 > > 
 > 
 > Only the -Os changes the value of -mpreferred-stack-boundary, breaking
 > the ability to support vectorization or other alignment dependent code
 > in the callee.

-Os breaks vectorization?  That would be A Bug, for sure.  Do you have
references, Bugzilla entries, for this?

Andrew.