gccint: Iterators

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1 17.23 Iterators
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1 Ports often need to define similar patterns for more than one machine
1 mode or for more than one rtx code.  GCC provides some simple iterator
1 facilities to make this process easier.
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· Mode Iterators         Generating variations of patterns for different modes.
· Code Iterators         Doing the same for codes.
· Int Iterators          Doing the same for integers.
· Subst Iterators        Generating variations of patterns for define_subst.
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