Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH] [20/45] x86_64: Use 8 byte stack alignment when possible | Date | Sat, 22 Sep 2007 00:34:31 +0200 |
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On Friday 21 September 2007 23:13, Dave Jones wrote: > On Fri, Sep 21, 2007 at 10:45:02PM +0200, Andi Kleen wrote: > > Kernel doesn't use SSE2, so it doesn't need 16 byte alignment. Also > > the stack can be already unaligned so letting the compiler align > > is useless. This may make some stack frames smaller. > > Only works with very recent gcc 4.3 > > My gcc 4.1.2 from Fedora 7 (with who knows what backported) > references this in its manpage. How was it broken before 4.3 ?
Try it. It is rejected by the compiler in 64bit mode.
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