Messages in this thread | | | Date | Tue, 25 Jan 2000 12:25:58 +0200 | From | Tuukka Toivonen <> | Subject | Re: Preventing gcc from aligning stack??? |
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> 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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