invoke.texi: Document -mzarch, -mesa, -mcpu= and -march= option for S/390 and zSeries.
* doc/invoke.texi: Document -mzarch, -mesa, -mcpu= and -march= option for S/390 and zSeries. * config/s390/s390.c (s390_cpu, s390_cpu_string, s390_arch, s390_arch_string): New variables. (override_options): Checking for options and setting of appropriate target_flags, cpu and arch flags. * config/s390/s390.h: (processor_type): New enum. (TARGET_SWITCHES): New switches -mesa/zarch. * config/s390/s390.md: New attribute 'cpu'. From-SVN: r60364
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