On Wed, Oct 09, 2013 at 04:46:56PM +0200, Peter Zijlstra wrote: > On Wed, Oct 09, 2013 at 04:33:59PM +0200, Peter Zijlstra wrote: > > On Wed, Oct 09, 2013 at 04:07:34PM +0200, Peter Zijlstra wrote: > > > Once I force a x86_64 build using the 'same' config it goes away and > > > generates 'sensible' code again (although I don't see why L9 isn't > > > merged with L2): > > > > i386-SMP also generates correct code afaict; a tad stupid but not wrong. > > > > If I remove ftrace from the .config its still broken.. > > If I also remove the likely/unlikely tracer its still broken and lots > > smaller: > > OK, its -march=winchip2 that's buggered.
Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670 Seems all of 4.[6-9] miscompile it. Will have a look tomorrow unless somebody beats me to it. But historically, the case where asm goto labels jump to fallthru basic block had numerous problems in the past. Jakub -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
