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You may want to be aware of this: http://gcc.gnu.org/wiki/SwingModuloScheduling It could be related.
Comments by Vladimir: --------------------- About software pipelining for Itanium: It is completely broken, more accurately it never worked for Itanium. Because it is very (probably most) important optimization for Itanium, after making SP working it should be switched on by default at least for Itanium to keep it working. GCC has a lot of optimizations which are not on by default and they have tendency to be broken sometime.
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