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* config/crx/crx.md: Make doloop_end pattern usage controllable via mloop-nesting=<max-nesting> command line switch. Make sure the combiner cannot use doloop_end_<mode> in an illegal way. * config/crx/crx.c: Use regs up to r6 for argument passing. Refine crx_address_cost (non cst4 displacements are expensive). * config/crx/crx.opt: Add switch for mloop-nesting=. From-SVN: r103518
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