Preventing gcc from aligning stack???

[Tuukka Toivonen]

> Yes it is. New gcc's (try to) keep the stack aligned at 16 bytes. The
> kernel stack is 8Kb on ia32; the 16byte alignment is mostly for floating
> point performance on Pentium and up, and floating point is forbidden in the

I'd like to ask, why? Even double is only 8 bytes. Does this mean that 12
bytes is wasted each argumentless call and -fno-omit-frame-pointer, for
saving ebp?

And as we got into gcc flags for compiling kernel (or anything) i'd like
to mention that aligning code has no effect on plain Pentium. Should use
-malign-loops/jumps=0 instead of 2 (is this still 2 for newest kernels?).


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