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The -mcpu= option accepts only a handful of string values. Using enums instead of strings to handle the accepted values removes the need to have specific processing of the strings in the backend, and simplifies any comparisons which need to be performed on the value. It also allows the default value to have semantic equivalence to a user set value, whilst retaining the ability to differentiate between them. Practically, this allows a user set -mcpu= value to override the the ISA set by -mmcu, whilst the default -mcpu= value can still have an explicit meaning. gcc/ChangeLog: * common/config/msp430/msp430-common.c (msp430_handle_option): Remove OPT_mcpu_ handling. Set target_cpu value to new enum values when parsing certain -mmcu= values. * config/msp430/msp430-opts.h (enum msp430_cpu_types): New. * config/msp430/msp430.c (msp430_option_override): Handle new target_cpu enum values. Set target_cpu using extracted value for given MCU when -mcpu= option is not passed by the user. * config/msp430/msp430.opt: Handle -mcpu= values using enums. gcc/testsuite/ChangeLog: * gcc.target/msp430/mcpu-is-430.c: New test. * gcc.target/msp430/mcpu-is-430x.c: New test. * gcc.target/msp430/mcpu-is-430xv2.c: New test.
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