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Re: Arranging for -Os to imply -mpreferred-stack-boundary=2 on x86
On Wed, Oct 24, 2001 at 02:38:42PM -0400, Geert Bosch wrote:
> On Wed, 24 Oct 2001, Richard Henderson wrote:
> I'd rather detect the required alignment of a function than use
> an attribute. Much friendlier when interacting with SSE code
> that doesn't just prefer 16 byte alignment, but requires it.
[...]
> 3. assume the stack may be misaligned and do alignment in the prologue of f
I mean this. For functions that do not call alloca, this
is as cheap as a single instruction in the prologue. If
alloca is used as well, then we need extra registers and
things get uglier.
r~