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GCC 5.3 Released

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Inter-procedural optimization improvements:

  • An Identical Code Folding (ICF) pass (controlled via -fipa-icf) has been added. Compared to the identical code folding performed by the Gold linker this pass does not require function sections. It also performs merging before inlining, so inter-procedural optimizations are aware of the code re-use. On the other hand not all unifications performed by a linker are doable by GCC which must honor aliasing information. During link-time optimization of Firefox, this pass unifies about 31000 functions, that is 14% overall.
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